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drm/bridge: cdns-dsi: Use video mode and clean up cdns_dsi_mode2cfg() 

The driver does all the calculations and programming with video timings
(hftp, hbp, etc.) instead of the modeline values (hsync_start, ...).
Thus it makes sense to use struct videomode instead of struct
drm_display_mode internally.

Switch to videomode and do some cleanups in cdns_dsi_mode2cfg() along
the way.

Tested-by: Parth Pancholi <parth.pancholi@toradex.com>
Reviewed-by: Aradhya Bhatia <aradhya.bhatia@linux.dev>
Tested-by: Jayesh Choudhary <j-choudhary@ti.com>
Reviewed-by: Devarsh Thakkar <devarsht@ti.com>
Link: https://lore.kernel.org/r/20250723-cdns-dsi-impro-v5-12-e61cc06074c2@ideasonboard.com
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
pull/1354/merge
Tomi Valkeinen 2025-07-23 13:05:18 +03:00
parent eea4f89b64
commit ce4bc5ca7c
1 changed files with 24 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
View File

@ -9,6 +9,7 @@
#include <drm/drm_drv.h>
#include <drm/drm_probe_helper.h>
#include <video/mipi_display.h>
#include <video/videomode.h>
#include <linux/clk.h>
#include <linux/interrupt.h>
@ -467,36 +468,35 @@ static unsigned int dpi_to_dsi_timing(unsigned int dpi_timing,
}
static int cdns_dsi_mode2cfg(struct cdns_dsi *dsi,
const struct drm_display_mode *mode,
const struct videomode *vm,
struct cdns_dsi_cfg *dsi_cfg)
{
struct cdns_dsi_output *output = &dsi->output;
unsigned int tmp;
bool sync_pulse = false;
u32 dpi_hsa, dpi_hbp, dpi_hfp, dpi_hact;
bool sync_pulse;
int bpp;
dpi_hsa = vm->hsync_len;
dpi_hbp = vm->hback_porch;
dpi_hfp = vm->hfront_porch;
dpi_hact = vm->hactive;
memset(dsi_cfg, 0, sizeof(*dsi_cfg));
if (output->dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
sync_pulse = true;
sync_pulse = output->dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
bpp = mipi_dsi_pixel_format_to_bpp(output->dev->format);
tmp = mode->htotal -
(sync_pulse ? mode->hsync_end : mode->hsync_start);
dsi_cfg->hbp = dpi_to_dsi_timing(dpi_hbp + (sync_pulse ? 0 : dpi_hsa),
bpp, DSI_HBP_FRAME_OVERHEAD);
dsi_cfg->hbp = dpi_to_dsi_timing(tmp, bpp, DSI_HBP_FRAME_OVERHEAD);
if (sync_pulse)
dsi_cfg->hsa =
dpi_to_dsi_timing(dpi_hsa, bpp, DSI_HSA_FRAME_OVERHEAD);
if (sync_pulse) {
tmp = mode->hsync_end - mode->hsync_start;
dsi_cfg->hact = dpi_to_dsi_timing(dpi_hact, bpp, 0);
dsi_cfg->hsa = dpi_to_dsi_timing(tmp, bpp,
DSI_HSA_FRAME_OVERHEAD);
}
dsi_cfg->hact = dpi_to_dsi_timing(mode->hdisplay, bpp, 0);
dsi_cfg->hfp = dpi_to_dsi_timing(mode->hsync_start - mode->hdisplay,
bpp, DSI_HFP_FRAME_OVERHEAD);
dsi_cfg->hfp = dpi_to_dsi_timing(dpi_hfp, bpp, DSI_HFP_FRAME_OVERHEAD);
dsi_cfg->htotal = dsi_cfg->hbp + DSI_HBP_FRAME_OVERHEAD;
if (output->dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
@ -509,7 +509,7 @@ static int cdns_dsi_mode2cfg(struct cdns_dsi *dsi,
}
static int cdns_dsi_check_conf(struct cdns_dsi *dsi,
const struct drm_display_mode *mode,
const struct videomode *vm,
struct cdns_dsi_cfg *dsi_cfg)
{
struct cdns_dsi_output *output = &dsi->output;
@ -517,11 +517,11 @@ static int cdns_dsi_check_conf(struct cdns_dsi *dsi,
unsigned int nlanes = output->dev->lanes;
int ret;
ret = cdns_dsi_mode2cfg(dsi, mode, dsi_cfg);
ret = cdns_dsi_mode2cfg(dsi, vm, dsi_cfg);
if (ret)
return ret;
ret = phy_mipi_dphy_get_default_config(mode->clock * 1000,
ret = phy_mipi_dphy_get_default_config(vm->pixelclock,
mipi_dsi_pixel_format_to_bpp(output->dev->format),
nlanes, phy_cfg);
if (ret)
@ -916,12 +916,15 @@ static int cdns_dsi_bridge_atomic_check(struct drm_bridge *bridge,
struct cdns_dsi_bridge_state *dsi_state = to_cdns_dsi_bridge_state(bridge_state);
struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
struct cdns_dsi_cfg *dsi_cfg = &dsi_state->dsi_cfg;
struct videomode vm;
/* cdns-dsi requires negative syncs */
adjusted_mode->flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC;
return cdns_dsi_check_conf(dsi, adjusted_mode, dsi_cfg);
drm_display_mode_to_videomode(adjusted_mode, &vm);
return cdns_dsi_check_conf(dsi, &vm, dsi_cfg);
}
static struct drm_bridge_state *