linux-kernel - Re: [PATCH 2/2] clk: qcom: gcc-sm8650: Do not turn off PCIe GDSCs during gdsc

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Message-ID: <f6a11ee9-ea10-4b7a-a67d-759b2e410620@linaro.org>
Date: Thu, 19 Dec 2024 18:03:04 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
 andersson@...nel.org, mturquette@...libre.com, sboyd@...nel.org
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 2/2] clk: qcom: gcc-sm8650: Do not turn off PCIe GDSCs
 during gdsc_disable()

On 19/12/2024 18:00, Manivannan Sadhasivam wrote:
> With PWRSTS_OFF_ON, PCIe GDSCs are turned off during gdsc_disable(). This
> can happen during scenarios such as system suspend and breaks the resume
> of PCIe controllers from suspend.
> 
> So use PWRSTS_RET_ON to indicate the GDSC driver to not turn off the GDSCs
> during gdsc_disable() and allow the hardware to transition the GDSCs to
> retention when the parent domain enters low power state during system
> suspend.
> 
> Cc: stable@...r.kernel.org # 6.8
> Fixes: c58225b7e3d7 ("clk: qcom: add the SM8650 Global Clock Controller driver, part 1")
> Reported-by: Neil Armstrong <neil.armstrong@...aro.org>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>   drivers/clk/qcom/gcc-sm8650.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/clk/qcom/gcc-sm8650.c b/drivers/clk/qcom/gcc-sm8650.c
> index fd9d6544bdd5..9dd5c48f33be 100644
> --- a/drivers/clk/qcom/gcc-sm8650.c
> +++ b/drivers/clk/qcom/gcc-sm8650.c
> @@ -3437,7 +3437,7 @@ static struct gdsc pcie_0_gdsc = {
>   	.pd = {
>   		.name = "pcie_0_gdsc",
>   	},
> -	.pwrsts = PWRSTS_OFF_ON,
> +	.pwrsts = PWRSTS_RET_ON,
>   	.flags = POLL_CFG_GDSCR | RETAIN_FF_ENABLE | VOTABLE,
>   };
>   
> @@ -3448,7 +3448,7 @@ static struct gdsc pcie_0_phy_gdsc = {
>   	.pd = {
>   		.name = "pcie_0_phy_gdsc",
>   	},
> -	.pwrsts = PWRSTS_OFF_ON,
> +	.pwrsts = PWRSTS_RET_ON,
>   	.flags = POLL_CFG_GDSCR | RETAIN_FF_ENABLE | VOTABLE,
>   };
>   
> @@ -3459,7 +3459,7 @@ static struct gdsc pcie_1_gdsc = {
>   	.pd = {
>   		.name = "pcie_1_gdsc",
>   	},
> -	.pwrsts = PWRSTS_OFF_ON,
> +	.pwrsts = PWRSTS_RET_ON,
>   	.flags = POLL_CFG_GDSCR | RETAIN_FF_ENABLE | VOTABLE,
>   };
>   
> @@ -3470,7 +3470,7 @@ static struct gdsc pcie_1_phy_gdsc = {
>   	.pd = {
>   		.name = "pcie_1_phy_gdsc",
>   	},
> -	.pwrsts = PWRSTS_OFF_ON,
> +	.pwrsts = PWRSTS_RET_ON,
>   	.flags = POLL_CFG_GDSCR | RETAIN_FF_ENABLE | VOTABLE,
>   };
>   

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on QRD8650