lkml.org 
[lkml]   [2019]   [Dec]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] phy: ufs-qcom: Invert PCS ready logic for SDM845 UFS
Date
The SDM845 UFS phy seems to want to do a low transition to become
ready, rather than a high transition. Without this, I am unable to
enumerate UFS on SDM845 when booted from USB.

Fixes: 14ced7e3a1a ('phy: qcom-qmp: Correct ready status, again')

Signed-off-by: Evan Green <evgreen@chromium.org>
---

Bjorn,
At this point I'm super confused on what the correct behavior
should be. Lack of documentation doesn't help. I'm worried that this
change breaks UFS on some other platforms, so I'm hoping you or some
PHY folks might have some advice on what the right thing to do is.

---
drivers/phy/qualcomm/phy-qcom-qmp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index 091e20303a14d..c4f4294360b6e 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -1657,7 +1657,7 @@ static int qcom_qmp_phy_enable(struct phy *phy)
if (cfg->type == PHY_TYPE_UFS) {
status = pcs + cfg->regs[QPHY_PCS_READY_STATUS];
mask = PCS_READY;
- ready = PCS_READY;
+ ready = 0;
} else {
status = pcs + cfg->regs[QPHY_PCS_STATUS];
mask = PHYSTATUS;
--
2.21.0
\
 
 \ /
  Last update: 2019-12-09 23:01    [W:0.188 / U:0.228 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site