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[1/2] clk: qcom: gcc-sm8550: Keep UFS PHY GDSCs ALWAYS_ON

Message ID 20241107-ufs-clk-fix-v1-1-6032ff22a052@linaro.org (mailing list archive)
State New
Headers show
Series clk: qcom: gcc-{sm8550/sm8650}: Fix UFS resume from suspend issue | expand

Commit Message

Manivannan Sadhasivam via B4 Relay Nov. 7, 2024, 11:58 a.m. UTC 
From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Starting from SM8550, UFS PHY GDSCs doesn't support hardware retention. So
using RETAIN_FF_ENABLE is wrong. Moreover, without ALWAYS_ON flag, GDSCs
will get powered down during suspend, causing the UFS PHY to loose its
state. And this will lead to below UFS error during resume as observed on
SM8550-QRD:

ufshcd-qcom 1d84000.ufs: ufshcd_uic_hibern8_exit: hibern8 exit failed. ret = 5
ufshcd-qcom 1d84000.ufs: __ufshcd_wl_resume: hibern8 exit failed 5
ufs_device_wlun 0:0:0:49488: ufshcd_wl_resume failed: 5
ufs_device_wlun 0:0:0:49488: PM: dpm_run_callback(): scsi_bus_resume+0x0/0x84 returns 5
ufs_device_wlun 0:0:0:49488: PM: failed to resume async: error 5

Cc: stable@vger.kernel.org # 6.8
Fixes: 1fe8273c8d40 ("clk: qcom: gcc-sm8550: Add the missing RETAIN_FF_ENABLE GDSC flag")
Reported-by: Neil Armstrong <neil.armstrong@linaro.org>
Suggested-by: Nitin Rawat <quic_nitirawa@quicinc.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/clk/qcom/gcc-sm8550.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Neil Armstrong Nov. 7, 2024, 12:26 p.m. UTC | #1 
On 07/11/2024 12:58, Manivannan Sadhasivam via B4 Relay wrote:
> From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> 
> Starting from SM8550, UFS PHY GDSCs doesn't support hardware retention. So
> using RETAIN_FF_ENABLE is wrong. Moreover, without ALWAYS_ON flag, GDSCs
> will get powered down during suspend, causing the UFS PHY to loose its
> state. And this will lead to below UFS error during resume as observed on
> SM8550-QRD:
> 
> ufshcd-qcom 1d84000.ufs: ufshcd_uic_hibern8_exit: hibern8 exit failed. ret = 5
> ufshcd-qcom 1d84000.ufs: __ufshcd_wl_resume: hibern8 exit failed 5
> ufs_device_wlun 0:0:0:49488: ufshcd_wl_resume failed: 5
> ufs_device_wlun 0:0:0:49488: PM: dpm_run_callback(): scsi_bus_resume+0x0/0x84 returns 5
> ufs_device_wlun 0:0:0:49488: PM: failed to resume async: error 5
> 
> Cc: stable@vger.kernel.org # 6.8
> Fixes: 1fe8273c8d40 ("clk: qcom: gcc-sm8550: Add the missing RETAIN_FF_ENABLE GDSC flag")
> Reported-by: Neil Armstrong <neil.armstrong@linaro.org>
> Suggested-by: Nitin Rawat <quic_nitirawa@quicinc.com>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> ---
>   drivers/clk/qcom/gcc-sm8550.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/qcom/gcc-sm8550.c b/drivers/clk/qcom/gcc-sm8550.c
> index 5abaeddd6afc..7dd08e175820 100644
> --- a/drivers/clk/qcom/gcc-sm8550.c
> +++ b/drivers/clk/qcom/gcc-sm8550.c
> @@ -3046,7 +3046,7 @@ static struct gdsc ufs_phy_gdsc = {
>   		.name = "ufs_phy_gdsc",
>   	},
>   	.pwrsts = PWRSTS_OFF_ON,
> -	.flags = POLL_CFG_GDSCR | RETAIN_FF_ENABLE,
> +	.flags = POLL_CFG_GDSCR | ALWAYS_ON,
>   };
>   
>   static struct gdsc ufs_mem_phy_gdsc = {
> @@ -3055,7 +3055,7 @@ static struct gdsc ufs_mem_phy_gdsc = {
>   		.name = "ufs_mem_phy_gdsc",
>   	},
>   	.pwrsts = PWRSTS_OFF_ON,
> -	.flags = POLL_CFG_GDSCR | RETAIN_FF_ENABLE,
> +	.flags = POLL_CFG_GDSCR | ALWAYS_ON,
>   };
>   
>   static struct gdsc usb30_prim_gdsc = {
> 

Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-HDK

Thanks,
Neil
diff mbox series

Patch

diff --git a/drivers/clk/qcom/gcc-sm8550.c b/drivers/clk/qcom/gcc-sm8550.c
index 5abaeddd6afc..7dd08e175820 100644
--- a/drivers/clk/qcom/gcc-sm8550.c
+++ b/drivers/clk/qcom/gcc-sm8550.c
@@ -3046,7 +3046,7 @@  static struct gdsc ufs_phy_gdsc = {
 		.name = "ufs_phy_gdsc",
 	},
 	.pwrsts = PWRSTS_OFF_ON,
-	.flags = POLL_CFG_GDSCR | RETAIN_FF_ENABLE,
+	.flags = POLL_CFG_GDSCR | ALWAYS_ON,
 };
 
 static struct gdsc ufs_mem_phy_gdsc = {
@@ -3055,7 +3055,7 @@  static struct gdsc ufs_mem_phy_gdsc = {
 		.name = "ufs_mem_phy_gdsc",
 	},
 	.pwrsts = PWRSTS_OFF_ON,
-	.flags = POLL_CFG_GDSCR | RETAIN_FF_ENABLE,
+	.flags = POLL_CFG_GDSCR | ALWAYS_ON,
 };
 
 static struct gdsc usb30_prim_gdsc = {