diff options
| author | Ed Tsai <ed.tsai@mediatek.com> | 2026-03-10 08:52:30 +0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2026-03-10 21:35:00 -0400 |
| commit | 20ca5460e5f95163b85dda555625a27d1c120ebf (patch) | |
| tree | 0752a8c7869520efa022c03d8915f0a4ccd0feeb /drivers/ufs | |
| parent | 6ab94d0194ddca662da69cf42b98dcf74690ed92 (diff) | |
| download | lwn-20ca5460e5f95163b85dda555625a27d1c120ebf.tar.gz lwn-20ca5460e5f95163b85dda555625a27d1c120ebf.zip | |
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>
Diffstat (limited to 'drivers/ufs')
| -rw-r--r-- | drivers/ufs/host/ufs-mediatek.c | 11 | ||||
| -rw-r--r-- | drivers/ufs/host/ufs-mediatek.h | 4 |
2 files changed, 15 insertions, 0 deletions
diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c index b3daaa07e925..4618d7834414 100644 --- a/drivers/ufs/host/ufs-mediatek.c +++ b/drivers/ufs/host/ufs-mediatek.c @@ -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); diff --git a/drivers/ufs/host/ufs-mediatek.h b/drivers/ufs/host/ufs-mediatek.h index 9747277f11e8..8547a6f04990 100644 --- a/drivers/ufs/host/ufs-mediatek.h +++ b/drivers/ufs/host/ufs-mediatek.h @@ -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 }; |