dmaengine updates for v6.19

Updates:
   - Renesas driver conversion to RUNTIME_PM_OPS() etc
   - Dropping module alias on bunch of drivers
   - GPI Block event interrupt support in Qualcomm driver and updates to I2C
     driver as well
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Merge tag 'dmaengine-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine

Pull dmaengine updates from Vinod Koul:

 - Renesas driver conversion to RUNTIME_PM_OPS() etc

 - Dropping module alias on bunch of drivers

 - GPI Block event interrupt support in Qualcomm driver and updates to
   I2C driver as well

* tag 'dmaengine-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine: (23 commits)
  dt-bindings: dma: xilinx: Simplify dma-coherent property
  dmaengine: fsl-edma: configure tcd attr with separate src and dst settings
  dmaengine: st_fdma: drop unused module alias
  dmaengine: bcm2835: enable compile testing
  dmaengine: tegra210-adma: drop unused module alias
  dmaengine: sprd: drop unused module alias
  dmaengine: mmp_tdma: drop unnecessary OF node check in remove
  dmaengine: mmp_tdma: drop unused module alias
  dmaengine: k3dma: drop unused module alias
  dmaengine: fsl-qdma: drop unused module alias
  dmaengine: fsl-edma: drop unused module alias
  dmaengine: dw: drop unused module alias
  dmaengine: bcm2835: drop unused module alias
  dmaengine: at_hdmac: add COMPILE_TEST support
  dmaengine: at_hdmac: fix formats under 64-bit
  i2c: i2c-qcom-geni: Add Block event interrupt support
  dmaengine: qcom: gpi: Add GPI Block event interrupt support
  dmaengine: idxd: drain ATS translations when disabling WQ
  dmaengine: sh: Kconfig: Drop ARCH_R7S72100/ARCH_RZG2L dependency
  dmaengine: rcar-dmac: Convert to NOIRQ_SYSTEM_SLEEP/RUNTIME_PM_OPS()
  ...

Documentation/devicetree/bindings/dma/xilinx/xlnx,zynqmp-dma-1.0.yaml

@@ -59,8 +59,7 @@ properties:
   power-domains:
     maxItems: 1
 
-  dma-coherent:
+  dma-coherent: true
-    description: present if dma operations are coherent
 
 required:
   - "#dma-cells"

drivers/dma/Kconfig

@@ -102,7 +102,7 @@ config ARM_DMA350
 
 config AT_HDMAC
 	tristate "Atmel AHB DMA support"
-	depends on ARCH_AT91
+	depends on ARCH_AT91 || COMPILE_TEST
 	select DMA_ENGINE
 	select DMA_VIRTUAL_CHANNELS
 	help
@@ -143,7 +143,7 @@ config BCM_SBA_RAID
 
 config DMA_BCM2835
 	tristate "BCM2835 DMA engine support"
-	depends on ARCH_BCM2835
+	depends on ARCH_BCM2835 || COMPILE_TEST
 	select DMA_ENGINE
 	select DMA_VIRTUAL_CHANNELS
 

drivers/dma/at_hdmac.c

@@ -887,7 +887,7 @@ atc_prep_dma_interleaved(struct dma_chan *chan,
 	first = xt->sgl;
 
 	dev_info(chan2dev(chan),
-		 "%s: src=%pad, dest=%pad, numf=%d, frame_size=%d, flags=0x%lx\n",
+		 "%s: src=%pad, dest=%pad, numf=%zu, frame_size=%zu, flags=0x%lx\n",
 		__func__, &xt->src_start, &xt->dst_start, xt->numf,
 		xt->frame_size, flags);
 
@@ -1174,7 +1174,7 @@ atc_prep_dma_memset_sg(struct dma_chan *chan,
 	int			i;
 	int			ret;
 
-	dev_vdbg(chan2dev(chan), "%s: v0x%x l0x%zx f0x%lx\n", __func__,
+	dev_vdbg(chan2dev(chan), "%s: v0x%x l0x%x f0x%lx\n", __func__,
 		 value, sg_len, flags);
 
 	if (unlikely(!sgl || !sg_len)) {
@@ -1503,7 +1503,7 @@ atc_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
 	unsigned int		periods = buf_len / period_len;
 	unsigned int		i;
 
-	dev_vdbg(chan2dev(chan), "prep_dma_cyclic: %s buf@%pad - %d (%d/%d)\n",
+	dev_vdbg(chan2dev(chan), "prep_dma_cyclic: %s buf@%pad - %d (%zu/%zu)\n",
 			direction == DMA_MEM_TO_DEV ? "TO DEVICE" : "FROM DEVICE",
 			&buf_addr,
 			periods, buf_len, period_len);

drivers/dma/bcm2835-dma.c

@@ -1060,7 +1060,6 @@ static struct platform_driver bcm2835_dma_driver = {
 
 module_platform_driver(bcm2835_dma_driver);
 
-MODULE_ALIAS("platform:bcm2835-dma");
 MODULE_DESCRIPTION("BCM2835 DMA engine driver");
 MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
 MODULE_LICENSE("GPL");

drivers/dma/dw/platform.c

@@ -21,8 +21,6 @@
 
 #include "internal.h"
 
-#define DRV_NAME	"dw_dmac"
-
 static int dw_probe(struct platform_device *pdev)
 {
 	const struct dw_dma_chip_pdata *match;
@@ -190,7 +188,7 @@ static struct platform_driver dw_driver = {
 	.remove		= dw_remove,
 	.shutdown       = dw_shutdown,
 	.driver = {
-		.name	= DRV_NAME,
+		.name	= "dw_dmac",
 		.pm	= pm_sleep_ptr(&dw_dev_pm_ops),
 		.of_match_table = of_match_ptr(dw_dma_of_id_table),
 		.acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),
@@ -211,4 +209,3 @@ module_exit(dw_exit);
 
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver");
-MODULE_ALIAS("platform:" DRV_NAME);

drivers/dma/fsl-edma-common.c

@@ -206,15 +206,19 @@ void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
 		mux_configure8(fsl_chan, muxaddr, ch_off, slot, enable);
 }
 
-static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width)
+static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth src_addr_width,
+					  enum dma_slave_buswidth dst_addr_width)
 {
-	u32 val;
+	u32 src_val, dst_val;
 
-	if (addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
+	if (src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
-		addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+		src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	if (dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
+		dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 
-	val = ffs(addr_width) - 1;
+	src_val = ffs(src_addr_width) - 1;
-	return val | (val << 8);
+	dst_val = ffs(dst_addr_width) - 1;
+	return dst_val | (src_val << 8);
 }
 
 void fsl_edma_free_desc(struct virt_dma_desc *vdesc)
@@ -612,13 +616,19 @@ struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
 
 	dma_buf_next = dma_addr;
 	if (direction == DMA_MEM_TO_DEV) {
+		if (!fsl_chan->cfg.src_addr_width)
+			fsl_chan->cfg.src_addr_width = fsl_chan->cfg.dst_addr_width;
 		fsl_chan->attr =
-			fsl_edma_get_tcd_attr(fsl_chan->cfg.dst_addr_width);
+			fsl_edma_get_tcd_attr(fsl_chan->cfg.src_addr_width,
+					      fsl_chan->cfg.dst_addr_width);
 		nbytes = fsl_chan->cfg.dst_addr_width *
 			fsl_chan->cfg.dst_maxburst;
 	} else {
+		if (!fsl_chan->cfg.dst_addr_width)
+			fsl_chan->cfg.dst_addr_width = fsl_chan->cfg.src_addr_width;
 		fsl_chan->attr =
-			fsl_edma_get_tcd_attr(fsl_chan->cfg.src_addr_width);
+			fsl_edma_get_tcd_attr(fsl_chan->cfg.src_addr_width,
+					      fsl_chan->cfg.dst_addr_width);
 		nbytes = fsl_chan->cfg.src_addr_width *
 			fsl_chan->cfg.src_maxburst;
 	}
@@ -689,13 +699,19 @@ struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
 	fsl_desc->dirn = direction;
 
 	if (direction == DMA_MEM_TO_DEV) {
+		if (!fsl_chan->cfg.src_addr_width)
+			fsl_chan->cfg.src_addr_width = fsl_chan->cfg.dst_addr_width;
 		fsl_chan->attr =
-			fsl_edma_get_tcd_attr(fsl_chan->cfg.dst_addr_width);
+			fsl_edma_get_tcd_attr(fsl_chan->cfg.src_addr_width,
+					      fsl_chan->cfg.dst_addr_width);
 		nbytes = fsl_chan->cfg.dst_addr_width *
 			fsl_chan->cfg.dst_maxburst;
 	} else {
+		if (!fsl_chan->cfg.dst_addr_width)
+			fsl_chan->cfg.dst_addr_width = fsl_chan->cfg.src_addr_width;
 		fsl_chan->attr =
-			fsl_edma_get_tcd_attr(fsl_chan->cfg.src_addr_width);
+			fsl_edma_get_tcd_attr(fsl_chan->cfg.src_addr_width,
+					      fsl_chan->cfg.dst_addr_width);
 		nbytes = fsl_chan->cfg.src_addr_width *
 			fsl_chan->cfg.src_maxburst;
 	}
@@ -766,6 +782,10 @@ struct dma_async_tx_descriptor *fsl_edma_prep_memcpy(struct dma_chan *chan,
 {
 	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 	struct fsl_edma_desc *fsl_desc;
+	u32 src_bus_width, dst_bus_width;
+
+	src_bus_width = min_t(u32, DMA_SLAVE_BUSWIDTH_32_BYTES, 1 << (ffs(dma_src) - 1));
+	dst_bus_width = min_t(u32, DMA_SLAVE_BUSWIDTH_32_BYTES, 1 << (ffs(dma_dst) - 1));
 
 	fsl_desc = fsl_edma_alloc_desc(fsl_chan, 1);
 	if (!fsl_desc)
@@ -778,8 +798,9 @@ struct dma_async_tx_descriptor *fsl_edma_prep_memcpy(struct dma_chan *chan,
 
 	/* To match with copy_align and max_seg_size so 1 tcd is enough */
 	fsl_edma_fill_tcd(fsl_chan, fsl_desc->tcd[0].vtcd, dma_src, dma_dst,
-			fsl_edma_get_tcd_attr(DMA_SLAVE_BUSWIDTH_32_BYTES),
+			fsl_edma_get_tcd_attr(src_bus_width, dst_bus_width),
-			32, len, 0, 1, 1, 32, 0, true, true, false);
+			src_bus_width, len, 0, 1, 1, dst_bus_width, 0, true,
+			true, false);
 
 	return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
 }

drivers/dma/fsl-edma-main.c

@@ -999,6 +999,5 @@ static void __exit fsl_edma_exit(void)
 }
 module_exit(fsl_edma_exit);
 
-MODULE_ALIAS("platform:fsl-edma");
 MODULE_DESCRIPTION("Freescale eDMA engine driver");
 MODULE_LICENSE("GPL v2");

drivers/dma/fsl-qdma.c

@@ -1296,6 +1296,5 @@ static struct platform_driver fsl_qdma_driver = {
 
 module_platform_driver(fsl_qdma_driver);
 
-MODULE_ALIAS("platform:fsl-qdma");
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("NXP Layerscape qDMA engine driver");

drivers/dma/idxd/device.c

@@ -16,6 +16,7 @@ static void idxd_cmd_exec(struct idxd_device *idxd, int cmd_code, u32 operand,
 			  u32 *status);
 static void idxd_device_wqs_clear_state(struct idxd_device *idxd);
 static void idxd_wq_disable_cleanup(struct idxd_wq *wq);
+static int idxd_wq_config_write(struct idxd_wq *wq);
 
 /* Interrupt control bits */
 void idxd_unmask_error_interrupts(struct idxd_device *idxd)
@@ -215,14 +216,28 @@ int idxd_wq_disable(struct idxd_wq *wq, bool reset_config)
 		return 0;
 	}
 
+	/*
+	 * Disable WQ does not drain address translations, if WQ attributes are
+	 * changed before translations are drained, pending translations can
+	 * be issued using updated WQ attibutes, resulting in invalid
+	 * translations being cached in the device translation cache.
+	 *
+	 * To make sure pending translations are drained before WQ
+	 * attributes are changed, we use a WQ Drain followed by WQ Reset and
+	 * then restore the WQ configuration.
+	 */
+	idxd_wq_drain(wq);
+
 	operand = BIT(wq->id % 16) | ((wq->id / 16) << 16);
-	idxd_cmd_exec(idxd, IDXD_CMD_DISABLE_WQ, operand, &status);
+	idxd_cmd_exec(idxd, IDXD_CMD_RESET_WQ, operand, &status);
 
 	if (status != IDXD_CMDSTS_SUCCESS) {
-		dev_dbg(dev, "WQ disable failed: %#x\n", status);
+		dev_dbg(dev, "WQ reset failed: %#x\n", status);
 		return -ENXIO;
 	}
 
+	idxd_wq_config_write(wq);
+
 	if (reset_config)
 		idxd_wq_disable_cleanup(wq);
 	clear_bit(wq->id, idxd->wq_enable_map);

drivers/dma/k3dma.c

@@ -1034,5 +1034,4 @@ static struct platform_driver k3_pdma_driver = {
 module_platform_driver(k3_pdma_driver);
 
 MODULE_DESCRIPTION("HiSilicon k3 DMA Driver");
-MODULE_ALIAS("platform:k3dma");
 MODULE_LICENSE("GPL v2");

drivers/dma/mmp_tdma.c

@@ -554,7 +554,6 @@ static void mmp_tdma_issue_pending(struct dma_chan *chan)
 
 static void mmp_tdma_remove(struct platform_device *pdev)
 {
-	if (pdev->dev.of_node)
 	of_dma_controller_free(pdev->dev.of_node);
 }
 
@@ -743,6 +742,5 @@ module_platform_driver(mmp_tdma_driver);
 
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("MMP Two-Channel DMA Driver");
-MODULE_ALIAS("platform:mmp-tdma");
 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
 MODULE_AUTHOR("Zhangfei Gao <zhangfei.gao@marvell.com>");

drivers/dma/nbpfaxi.c

@@ -1500,7 +1500,6 @@ static const struct platform_device_id nbpf_ids[] = {
 };
 MODULE_DEVICE_TABLE(platform, nbpf_ids);
 
-#ifdef CONFIG_PM
 static int nbpf_runtime_suspend(struct device *dev)
 {
 	struct nbpf_device *nbpf = dev_get_drvdata(dev);
@@ -1513,17 +1512,16 @@ static int nbpf_runtime_resume(struct device *dev)
 	struct nbpf_device *nbpf = dev_get_drvdata(dev);
 	return clk_prepare_enable(nbpf->clk);
 }
-#endif
 
 static const struct dev_pm_ops nbpf_pm_ops = {
-	SET_RUNTIME_PM_OPS(nbpf_runtime_suspend, nbpf_runtime_resume, NULL)
+	RUNTIME_PM_OPS(nbpf_runtime_suspend, nbpf_runtime_resume, NULL)
 };
 
 static struct platform_driver nbpf_driver = {
 	.driver = {
 		.name = "dma-nbpf",
 		.of_match_table = nbpf_match,
-		.pm = &nbpf_pm_ops,
+		.pm = pm_ptr(&nbpf_pm_ops),
 	},
 	.id_table = nbpf_ids,
 	.probe = nbpf_probe,

drivers/dma/qcom/gpi.c

@@ -1619,7 +1619,8 @@ gpi_peripheral_config(struct dma_chan *chan, struct dma_slave_config *config)
 }
 
 static int gpi_create_i2c_tre(struct gchan *chan, struct gpi_desc *desc,
-			      struct scatterlist *sgl, enum dma_transfer_direction direction)
+			      struct scatterlist *sgl, enum dma_transfer_direction direction,
+			      unsigned long flags)
 {
 	struct gpi_i2c_config *i2c = chan->config;
 	struct device *dev = chan->gpii->gpi_dev->dev;
@@ -1684,6 +1685,9 @@ static int gpi_create_i2c_tre(struct gchan *chan, struct gpi_desc *desc,
 
 		tre->dword[3] = u32_encode_bits(TRE_TYPE_DMA, TRE_FLAGS_TYPE);
 		tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_IEOT);
+
+		if (!(flags & DMA_PREP_INTERRUPT))
+			tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_BEI);
 	}
 
 	for (i = 0; i < tre_idx; i++)
@@ -1827,6 +1831,9 @@ gpi_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
 		return NULL;
 	}
 
+	if (!(flags & DMA_PREP_INTERRUPT) && (nr - nr_tre < 2))
+		return NULL;
+
 	gpi_desc = kzalloc(sizeof(*gpi_desc), GFP_NOWAIT);
 	if (!gpi_desc)
 		return NULL;
@@ -1835,7 +1842,7 @@ gpi_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
 	if (gchan->protocol == QCOM_GPI_SPI) {
 		i = gpi_create_spi_tre(gchan, gpi_desc, sgl, direction);
 	} else if (gchan->protocol == QCOM_GPI_I2C) {
-		i = gpi_create_i2c_tre(gchan, gpi_desc, sgl, direction);
+		i = gpi_create_i2c_tre(gchan, gpi_desc, sgl, direction, flags);
 	} else {
 		dev_err(dev, "invalid peripheral: %d\n", gchan->protocol);
 		kfree(gpi_desc);

drivers/dma/sh/Kconfig

@@ -50,7 +50,7 @@ config RENESAS_USB_DMAC
 
 config RZ_DMAC
 	tristate "Renesas RZ DMA Controller"
-	depends on ARCH_R7S72100 || ARCH_RZG2L || COMPILE_TEST
+	depends on ARCH_RENESAS || COMPILE_TEST
 	select RENESAS_DMA
 	select DMA_VIRTUAL_CHANNELS
 	help

drivers/dma/sh/rcar-dmac.c

@@ -1728,19 +1728,12 @@ static struct dma_chan *rcar_dmac_of_xlate(struct of_phandle_args *dma_spec,
  * Power management
  */
 
-#ifdef CONFIG_PM
-static int rcar_dmac_runtime_suspend(struct device *dev)
-{
-	return 0;
-}
-
 static int rcar_dmac_runtime_resume(struct device *dev)
 {
 	struct rcar_dmac *dmac = dev_get_drvdata(dev);
 
 	return rcar_dmac_init(dmac);
 }
-#endif
 
 static const struct dev_pm_ops rcar_dmac_pm = {
 	/*
@@ -1748,10 +1741,9 @@ static const struct dev_pm_ops rcar_dmac_pm = {
 	 *   - Wait for the current transfer to complete and stop the device,
 	 *   - Resume transfers, if any.
 	 */
-	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+	NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 				  pm_runtime_force_resume)
-	SET_RUNTIME_PM_OPS(rcar_dmac_runtime_suspend, rcar_dmac_runtime_resume,
+	RUNTIME_PM_OPS(NULL, rcar_dmac_runtime_resume, NULL)
-			   NULL)
 };
 
 /* -----------------------------------------------------------------------------
@@ -2036,7 +2028,7 @@ MODULE_DEVICE_TABLE(of, rcar_dmac_of_ids);
 
 static struct platform_driver rcar_dmac_driver = {
 	.driver		= {
-		.pm	= &rcar_dmac_pm,
+		.pm	= pm_ptr(&rcar_dmac_pm),
 		.name	= "rcar-dmac",
 		.of_match_table = rcar_dmac_of_ids,
 	},

drivers/dma/sh/usb-dmac.c

@@ -670,7 +670,6 @@ static struct dma_chan *usb_dmac_of_xlate(struct of_phandle_args *dma_spec,
  * Power management
  */
 
-#ifdef CONFIG_PM
 static int usb_dmac_runtime_suspend(struct device *dev)
 {
 	struct usb_dmac *dmac = dev_get_drvdata(dev);
@@ -691,13 +690,11 @@ static int usb_dmac_runtime_resume(struct device *dev)
 
 	return usb_dmac_init(dmac);
 }
-#endif /* CONFIG_PM */
 
 static const struct dev_pm_ops usb_dmac_pm = {
-	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+	NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 				  pm_runtime_force_resume)
-	SET_RUNTIME_PM_OPS(usb_dmac_runtime_suspend, usb_dmac_runtime_resume,
+	RUNTIME_PM_OPS(usb_dmac_runtime_suspend, usb_dmac_runtime_resume, NULL)
-			   NULL)
 };
 
 /* -----------------------------------------------------------------------------
@@ -894,7 +891,7 @@ MODULE_DEVICE_TABLE(of, usb_dmac_of_ids);
 
 static struct platform_driver usb_dmac_driver = {
 	.driver		= {
-		.pm	= &usb_dmac_pm,
+		.pm	= pm_ptr(&usb_dmac_pm),
 		.name	= "usb-dmac",
 		.of_match_table = usb_dmac_of_ids,
 	},

drivers/dma/sprd-dma.c

@@ -1311,4 +1311,3 @@ MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("DMA driver for Spreadtrum");
 MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
 MODULE_AUTHOR("Eric Long <eric.long@spreadtrum.com>");
-MODULE_ALIAS("platform:sprd-dma");

drivers/dma/st_fdma.c

@@ -866,4 +866,3 @@ MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("STMicroelectronics FDMA engine driver");
 MODULE_AUTHOR("Ludovic.barre <Ludovic.barre@st.com>");
 MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>");
-MODULE_ALIAS("platform:" DRIVER_NAME);

drivers/dma/tegra210-adma.c

@@ -1230,7 +1230,6 @@ static struct platform_driver tegra_admac_driver = {
 
 module_platform_driver(tegra_admac_driver);
 
-MODULE_ALIAS("platform:tegra210-adma");
 MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver");
 MODULE_AUTHOR("Dara Ramesh <dramesh@nvidia.com>");
 MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");

drivers/i2c/busses/i2c-qcom-geni.c

@@ -77,6 +77,25 @@ enum geni_i2c_err_code {
 #define XFER_TIMEOUT		HZ
 #define RST_TIMEOUT		HZ
 
+#define QCOM_I2C_MIN_NUM_OF_MSGS_MULTI_DESC	2
+
+/**
+ * struct geni_i2c_gpi_multi_desc_xfer - Structure for multi transfer support
+ *
+ * @msg_idx_cnt: Current message index being processed in the transfer
+ * @unmap_msg_cnt: Number of messages that have been unmapped
+ * @irq_cnt: Number of transfer completion interrupts received
+ * @dma_buf: Array of virtual addresses for DMA-safe buffers
+ * @dma_addr: Array of DMA addresses corresponding to the buffers
+ */
+struct geni_i2c_gpi_multi_desc_xfer {
+	u32 msg_idx_cnt;
+	u32 unmap_msg_cnt;
+	u32 irq_cnt;
+	void **dma_buf;
+	dma_addr_t *dma_addr;
+};
+
 struct geni_i2c_dev {
 	struct geni_se se;
 	u32 tx_wm;
@@ -99,6 +118,9 @@ struct geni_i2c_dev {
 	struct dma_chan *rx_c;
 	bool gpi_mode;
 	bool abort_done;
+	bool is_tx_multi_desc_xfer;
+	u32 num_msgs;
+	struct geni_i2c_gpi_multi_desc_xfer i2c_multi_desc_config;
 };
 
 struct geni_i2c_desc {
@@ -499,6 +521,7 @@ static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
 static void i2c_gpi_cb_result(void *cb, const struct dmaengine_result *result)
 {
 	struct geni_i2c_dev *gi2c = cb;
+	struct geni_i2c_gpi_multi_desc_xfer *tx_multi_xfer;
 
 	if (result->result != DMA_TRANS_NOERROR) {
 		dev_err(gi2c->se.dev, "DMA txn failed:%d\n", result->result);
@@ -507,6 +530,11 @@ static void i2c_gpi_cb_result(void *cb, const struct dmaengine_result *result)
 		dev_dbg(gi2c->se.dev, "DMA xfer has pending: %d\n", result->residue);
 	}
 
+	if (gi2c->is_tx_multi_desc_xfer) {
+		tx_multi_xfer = &gi2c->i2c_multi_desc_config;
+		tx_multi_xfer->irq_cnt++;
+	}
+
 	complete(&gi2c->done);
 }
 
@@ -525,7 +553,72 @@ static void geni_i2c_gpi_unmap(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
 	}
 }
 
-static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
+/**
+ * geni_i2c_gpi_multi_desc_unmap() - Unmaps DMA buffers post multi message TX transfers
+ * @gi2c: I2C dev handle
+ * @msgs: Array of I2C  messages
+ * @peripheral: Pointer to gpi_i2c_config
+ */
+static void geni_i2c_gpi_multi_desc_unmap(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[],
+					  struct gpi_i2c_config *peripheral)
+{
+	u32 msg_xfer_cnt, wr_idx = 0;
+	struct geni_i2c_gpi_multi_desc_xfer *tx_multi_xfer = &gi2c->i2c_multi_desc_config;
+
+	msg_xfer_cnt = gi2c->err ? tx_multi_xfer->msg_idx_cnt : tx_multi_xfer->irq_cnt;
+
+	/* Unmap the processed DMA buffers based on the received interrupt count */
+	for (; tx_multi_xfer->unmap_msg_cnt < msg_xfer_cnt; tx_multi_xfer->unmap_msg_cnt++) {
+		wr_idx = tx_multi_xfer->unmap_msg_cnt;
+		geni_i2c_gpi_unmap(gi2c, &msgs[wr_idx],
+				   tx_multi_xfer->dma_buf[wr_idx],
+				   tx_multi_xfer->dma_addr[wr_idx],
+				   NULL, 0);
+
+		if (tx_multi_xfer->unmap_msg_cnt == gi2c->num_msgs - 1) {
+			kfree(tx_multi_xfer->dma_buf);
+			kfree(tx_multi_xfer->dma_addr);
+			break;
+		}
+	}
+}
+
+/**
+ * geni_i2c_gpi_multi_xfer_timeout_handler() - Handles multi message transfer timeout
+ * @dev: Pointer to the corresponding dev node
+ * @multi_xfer: Pointer to the geni_i2c_gpi_multi_desc_xfer
+ * @transfer_timeout_msecs: Timeout value in milliseconds
+ * @transfer_comp: Completion object of the transfer
+ *
+ * This function waits for the completion of each processed transfer messages
+ * based on the interrupts generated upon transfer completion.
+ *
+ * Return: On success returns 0, -ETIMEDOUT on timeout.
+ */
+static int geni_i2c_gpi_multi_xfer_timeout_handler(struct device *dev,
+						   struct geni_i2c_gpi_multi_desc_xfer *multi_xfer,
+						   u32 transfer_timeout_msecs,
+						   struct completion *transfer_comp)
+{
+	int i;
+	u32 time_left;
+
+	for (i = 0; i < multi_xfer->msg_idx_cnt - 1; i++) {
+		reinit_completion(transfer_comp);
+
+		if (multi_xfer->msg_idx_cnt != multi_xfer->irq_cnt) {
+			time_left = wait_for_completion_timeout(transfer_comp,
+								transfer_timeout_msecs);
+			if (!time_left) {
+				dev_err(dev, "%s: Transfer timeout\n", __func__);
+				return -ETIMEDOUT;
+			}
+		}
+	}
+	return 0;
+}
+
+static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[],
 			struct dma_slave_config *config, dma_addr_t *dma_addr_p,
 			void **buf, unsigned int op, struct dma_chan *dma_chan)
 {
@@ -537,26 +630,45 @@ static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
 	enum dma_transfer_direction dma_dirn;
 	struct dma_async_tx_descriptor *desc;
 	int ret;
+	struct geni_i2c_gpi_multi_desc_xfer *gi2c_gpi_xfer;
+	dma_cookie_t cookie;
+	u32 msg_idx;
 
 	peripheral = config->peripheral_config;
+	gi2c_gpi_xfer = &gi2c->i2c_multi_desc_config;
+	msg_idx = gi2c_gpi_xfer->msg_idx_cnt;
 
-	dma_buf = i2c_get_dma_safe_msg_buf(msg, 1);
+	dma_buf = i2c_get_dma_safe_msg_buf(&msgs[msg_idx], 1);
-	if (!dma_buf)
+	if (!dma_buf) {
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto out;
+	}
 
 	if (op == I2C_WRITE)
 		map_dirn = DMA_TO_DEVICE;
 	else
 		map_dirn = DMA_FROM_DEVICE;
 
-	addr = dma_map_single(gi2c->se.dev->parent, dma_buf, msg->len, map_dirn);
+	addr = dma_map_single(gi2c->se.dev->parent, dma_buf,
+			      msgs[msg_idx].len, map_dirn);
 	if (dma_mapping_error(gi2c->se.dev->parent, addr)) {
-		i2c_put_dma_safe_msg_buf(dma_buf, msg, false);
+		i2c_put_dma_safe_msg_buf(dma_buf, &msgs[msg_idx], false);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	if (gi2c->is_tx_multi_desc_xfer) {
+		flags = DMA_CTRL_ACK;
+
+		/* BEI bit to be cleared for last TRE */
+		if (msg_idx == gi2c->num_msgs - 1)
+			flags |= DMA_PREP_INTERRUPT;
+	} else {
+		flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
 	}
 
 	/* set the length as message for rx txn */
-	peripheral->rx_len = msg->len;
+	peripheral->rx_len = msgs[msg_idx].len;
 	peripheral->op = op;
 
 	ret = dmaengine_slave_config(dma_chan, config);
@@ -567,14 +679,21 @@ static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
 
 	peripheral->set_config = 0;
 	peripheral->multi_msg = true;
-	flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
 
 	if (op == I2C_WRITE)
 		dma_dirn = DMA_MEM_TO_DEV;
 	else
 		dma_dirn = DMA_DEV_TO_MEM;
 
-	desc = dmaengine_prep_slave_single(dma_chan, addr, msg->len, dma_dirn, flags);
+	desc = dmaengine_prep_slave_single(dma_chan, addr, msgs[msg_idx].len,
+					   dma_dirn, flags);
+	if (!desc && !(flags & DMA_PREP_INTERRUPT)) {
+		/* Retry with interrupt if not enough TREs */
+		flags |= DMA_PREP_INTERRUPT;
+		desc = dmaengine_prep_slave_single(dma_chan, addr, msgs[msg_idx].len,
+						   dma_dirn, flags);
+	}
+
 	if (!desc) {
 		dev_err(gi2c->se.dev, "prep_slave_sg failed\n");
 		ret = -EIO;
@@ -584,15 +703,48 @@ static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
 	desc->callback_result = i2c_gpi_cb_result;
 	desc->callback_param = gi2c;
 
-	dmaengine_submit(desc);
+	if (!((msgs[msg_idx].flags & I2C_M_RD) && op == I2C_WRITE))
+		gi2c_gpi_xfer->msg_idx_cnt++;
+
+	cookie = dmaengine_submit(desc);
+	if (dma_submit_error(cookie)) {
+		dev_err(gi2c->se.dev,
+			"%s: dmaengine_submit failed (%d)\n", __func__, cookie);
+		ret = -EINVAL;
+		goto err_config;
+	}
+
+	if (gi2c->is_tx_multi_desc_xfer) {
+		gi2c_gpi_xfer->dma_buf[msg_idx] = dma_buf;
+		gi2c_gpi_xfer->dma_addr[msg_idx] = addr;
+
+		dma_async_issue_pending(gi2c->tx_c);
+
+		if ((msg_idx == (gi2c->num_msgs - 1)) || flags & DMA_PREP_INTERRUPT) {
+			ret = geni_i2c_gpi_multi_xfer_timeout_handler(gi2c->se.dev, gi2c_gpi_xfer,
+								      XFER_TIMEOUT, &gi2c->done);
+			if (ret) {
+				dev_err(gi2c->se.dev,
+					"I2C multi write msg transfer timeout: %d\n",
+					ret);
+				gi2c->err = ret;
+				return ret;
+			}
+		}
+	} else {
+		/* Non multi descriptor message transfer */
 		*buf = dma_buf;
 		*dma_addr_p = addr;
-
+	}
 	return 0;
 
 err_config:
-	dma_unmap_single(gi2c->se.dev->parent, addr, msg->len, map_dirn);
+	dma_unmap_single(gi2c->se.dev->parent, addr,
-	i2c_put_dma_safe_msg_buf(dma_buf, msg, false);
+			 msgs[msg_idx].len, map_dirn);
+	i2c_put_dma_safe_msg_buf(dma_buf, &msgs[msg_idx], false);
+
+out:
+	gi2c->err = ret;
 	return ret;
 }
 
@@ -604,6 +756,7 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i
 	unsigned long time_left;
 	dma_addr_t tx_addr, rx_addr;
 	void *tx_buf = NULL, *rx_buf = NULL;
+	struct geni_i2c_gpi_multi_desc_xfer *tx_multi_xfer;
 	const struct geni_i2c_clk_fld *itr = gi2c->clk_fld;
 
 	config.peripheral_config = &peripheral;
@@ -617,6 +770,41 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i
 	peripheral.set_config = 1;
 	peripheral.multi_msg = false;
 
+	gi2c->num_msgs = num;
+	gi2c->is_tx_multi_desc_xfer = false;
+
+	tx_multi_xfer = &gi2c->i2c_multi_desc_config;
+	memset(tx_multi_xfer, 0, sizeof(struct geni_i2c_gpi_multi_desc_xfer));
+
+	/*
+	 * If number of write messages are two and higher then
+	 * configure hardware for multi descriptor transfers with BEI.
+	 */
+	if (num >= QCOM_I2C_MIN_NUM_OF_MSGS_MULTI_DESC) {
+		gi2c->is_tx_multi_desc_xfer = true;
+		for (i = 0; i < num; i++) {
+			if (msgs[i].flags & I2C_M_RD) {
+				/*
+				 * Multi descriptor transfer with BEI
+				 * support is enabled for write transfers.
+				 * TODO: Add BEI optimization support for
+				 * read transfers later.
+				 */
+				gi2c->is_tx_multi_desc_xfer = false;
+				break;
+			}
+		}
+	}
+
+	if (gi2c->is_tx_multi_desc_xfer) {
+		tx_multi_xfer->dma_buf = kcalloc(num, sizeof(void *), GFP_KERNEL);
+		tx_multi_xfer->dma_addr = kcalloc(num, sizeof(dma_addr_t), GFP_KERNEL);
+		if (!tx_multi_xfer->dma_buf || !tx_multi_xfer->dma_addr) {
+			ret = -ENOMEM;
+			goto err;
+		}
+	}
+
 	for (i = 0; i < num; i++) {
 		gi2c->cur = &msgs[i];
 		gi2c->err = 0;
@@ -627,14 +815,16 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i
 			peripheral.stretch = 1;
 
 		peripheral.addr = msgs[i].addr;
+		if (i > 0 && (!(msgs[i].flags & I2C_M_RD)))
+			peripheral.multi_msg = false;
 
-		ret =  geni_i2c_gpi(gi2c, &msgs[i], &config,
+		ret =  geni_i2c_gpi(gi2c, msgs, &config,
 				    &tx_addr, &tx_buf, I2C_WRITE, gi2c->tx_c);
 		if (ret)
 			goto err;
 
 		if (msgs[i].flags & I2C_M_RD) {
-			ret =  geni_i2c_gpi(gi2c, &msgs[i], &config,
+			ret =  geni_i2c_gpi(gi2c, msgs, &config,
 					    &rx_addr, &rx_buf, I2C_READ, gi2c->rx_c);
 			if (ret)
 				goto err;
@@ -642,18 +832,24 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i
 			dma_async_issue_pending(gi2c->rx_c);
 		}
 
+		if (!gi2c->is_tx_multi_desc_xfer) {
 			dma_async_issue_pending(gi2c->tx_c);
-
 			time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT);
-		if (!time_left)
+			if (!time_left) {
+				dev_err(gi2c->se.dev, "%s:I2C timeout\n", __func__);
 				gi2c->err = -ETIMEDOUT;
+			}
+		}
 
 		if (gi2c->err) {
 			ret = gi2c->err;
 			goto err;
 		}
 
+		if (!gi2c->is_tx_multi_desc_xfer)
 			geni_i2c_gpi_unmap(gi2c, &msgs[i], tx_buf, tx_addr, rx_buf, rx_addr);
+		else if (tx_multi_xfer->unmap_msg_cnt != tx_multi_xfer->irq_cnt)
+			geni_i2c_gpi_multi_desc_unmap(gi2c, msgs, &peripheral);
 	}
 
 	return num;
@@ -662,7 +858,11 @@ err:
 	dev_err(gi2c->se.dev, "GPI transfer failed: %d\n", ret);
 	dmaengine_terminate_sync(gi2c->rx_c);
 	dmaengine_terminate_sync(gi2c->tx_c);
+	if (gi2c->is_tx_multi_desc_xfer)
+		geni_i2c_gpi_multi_desc_unmap(gi2c, msgs, &peripheral);
+	else
 		geni_i2c_gpi_unmap(gi2c, &msgs[i], tx_buf, tx_addr, rx_buf, rx_addr);
+
 	return ret;
 }