[PATCH] clk: qcom: mmcc-msm8974: add GENPD_FLAG_NO_STAY_ON

[PATCH] clk: qcom: mmcc-msm8974: add GENPD_FLAG_NO_STAY_ON

[Dmitry Baryshkov]

Commit 13a4b7fb6260 ("pmdomain: core: Leave powered-on genpds on until
late_initcall_sync") kept power-domains on longer during boot which is
causing DSI clock to get stuck and fail to acquire its configuration on
DSI bringup. While this is being investigated, add the flag
GENPD_FLAG_NO_STAY_ON for MDSS GDSC on MSM8974 to restore the previous
behaviour to fix this.

Fixes: 13a4b7fb6260 ("pmdomain: core: Leave powered-on genpds on until late_initcall_sync")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/clk/qcom/mmcc-msm8974.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clk/qcom/mmcc-msm8974.c b/drivers/clk/qcom/mmcc-msm8974.c
index f2e802cf6afc..b04885864baf 100644
--- a/drivers/clk/qcom/mmcc-msm8974.c
+++ b/drivers/clk/qcom/mmcc-msm8974.c
@@ -2367,6 +2367,7 @@ static struct gdsc mdss_gdsc = {
 	.cxc_count = 2,
 	.pd = {
 		.name = "mdss",
+		.flags = GENPD_FLAG_NO_STAY_ON,
 	},
 	.pwrsts = PWRSTS_OFF_ON,
 };

---
base-commit: 6b8c8af514d739d0335f5579b585e02babe8a727
change-id: 20260809-msm8974-mmcc-fix-c83b5fa916af

Best regards,
--  
With best wishes
Dmitry

Re: [PATCH] clk: qcom: mmcc-msm8974: add GENPD_FLAG_NO_STAY_ON

[Stephan Gerhold]

On Sun, Aug 09, 2026 at 09:58:37PM +0300, Dmitry Baryshkov wrote:
> Commit 13a4b7fb6260 ("pmdomain: core: Leave powered-on genpds on until
> late_initcall_sync") kept power-domains on longer during boot which is
> causing DSI clock to get stuck and fail to acquire its configuration on
> DSI bringup. While this is being investigated, add the flag
> GENPD_FLAG_NO_STAY_ON for MDSS GDSC on MSM8974 to restore the previous
> behaviour to fix this.
> 
> Fixes: 13a4b7fb6260 ("pmdomain: core: Leave powered-on genpds on until late_initcall_sync")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Have you tried adding resets = <&mmcc MDSS_RESET>; to the &mdss node,
similar to the following patch for msm8916.dtsi?
https://lore.kernel.org/linux-arm-msm/20250915-msm8916-resets-v1-1-a5c705df0c45@linaro.org/

Thanks,
Stephan

Re: [PATCH] clk: qcom: mmcc-msm8974: add GENPD_FLAG_NO_STAY_ON

[Dmitry Baryshkov]

On Mon, Aug 10, 2026 at 10:37:13AM +0200, Stephan Gerhold wrote:
> On Sun, Aug 09, 2026 at 09:58:37PM +0300, Dmitry Baryshkov wrote:
> > Commit 13a4b7fb6260 ("pmdomain: core: Leave powered-on genpds on until
> > late_initcall_sync") kept power-domains on longer during boot which is
> > causing DSI clock to get stuck and fail to acquire its configuration on
> > DSI bringup. While this is being investigated, add the flag
> > GENPD_FLAG_NO_STAY_ON for MDSS GDSC on MSM8974 to restore the previous
> > behaviour to fix this.
> > 
> > Fixes: 13a4b7fb6260 ("pmdomain: core: Leave powered-on genpds on until late_initcall_sync")
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> 
> Have you tried adding resets = <&mmcc MDSS_RESET>; to the &mdss node,
> similar to the following patch for msm8916.dtsi?
> https://lore.kernel.org/linux-arm-msm/20250915-msm8916-resets-v1-1-a5c705df0c45@linaro.org/

Seems to work, thanks! Indeed, it's a better patch.

> 
> Thanks,
> Stephan

-- 
With best wishes
Dmitry