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scsi: ufs: host: mediatek: Add VCC on delay for stability 

Introduce a delay after enabling UFS5 VCC for MT6995 to ensure voltage
stability before refclk activation.

Signed-off-by: Ed Tsai <ed.tsai@mediatek.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://patch.msgid.link/20260310005230.4001904-6-ed.tsai@mediatek.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
master
Ed Tsai 2026-03-10 08:52:30 +08:00 committed by Martin K. Petersen
parent 6ab94d0194
commit 20ca5460e5
2 changed files with 15 additions and 0 deletions
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11
drivers/ufs/host/ufs-mediatek.c
View File

@ -1960,6 +1960,8 @@ static int ufs_mtk_apply_dev_quirks(struct ufs_hba *hba)
static void ufs_mtk_fixup_dev_quirks(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
ufshcd_fixup_dev_quirks(hba, ufs_mtk_dev_fixups);
if (ufs_mtk_is_broken_vcc(hba) && hba->vreg_info.vcc) {
@ -1971,6 +1973,15 @@ static void ufs_mtk_fixup_dev_quirks(struct ufs_hba *hba)
hba->dev_quirks &= ~UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM;
}
/*
* Add a delay after enabling UFS5 VCC to ensure the voltage
* is stable before the refclk is enabled.
*/
if (hba->dev_info.wspecversion >= 0x0500 &&
(host->ip_ver == IP_VER_MT6995_A0 ||
host->ip_ver == IP_VER_MT6995_B0))
hba->quirks |= UFSHCD_QUIRK_VCC_ON_DELAY;
ufs_mtk_vreg_fix_vcc(hba);
ufs_mtk_vreg_fix_vccqx(hba);
ufs_mtk_fix_ahit(hba);

4
drivers/ufs/host/ufs-mediatek.h
View File

@ -220,6 +220,10 @@ enum {
IP_VER_MT6991_B0 = 0x10470000,
IP_VER_MT6993 = 0x10480000,
/* UFSHCI 5.0 */
IP_VER_MT6995_A0 = 0x10490000,
IP_VER_MT6995_B0 = 0x10500000,
IP_VER_NONE = 0xFFFFFFFF
};