linux-kernel - Re: [PATCH 1/2] clk: qcom: gcc-sm8550: Do not turn off PCIe GDSCs during gdsc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <09df3401-7d06-4136-9098-ce9782e2a00f@linaro.org>
Date: Thu, 19 Dec 2024 18:02:40 +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 1/2] clk: qcom: gcc-sm8550: 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 # 6.2
> Fixes: 955f2ea3b9e9 ("clk: qcom: Add GCC driver for SM8550")
> Reported-by: Neil Armstrong <neil.armstrong@...aro.org>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>   drivers/clk/qcom/gcc-sm8550.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/clk/qcom/gcc-sm8550.c b/drivers/clk/qcom/gcc-sm8550.c
> index 5abaeddd6afc..862a9bf73bcb 100644
> --- a/drivers/clk/qcom/gcc-sm8550.c
> +++ b/drivers/clk/qcom/gcc-sm8550.c
> @@ -3003,7 +3003,7 @@ static struct gdsc pcie_0_gdsc = {
>   	.pd = {
>   		.name = "pcie_0_gdsc",
>   	},
> -	.pwrsts = PWRSTS_OFF_ON,
> +	.pwrsts = PWRSTS_RET_ON,
>   	.flags = VOTABLE | POLL_CFG_GDSCR | RETAIN_FF_ENABLE,
>   };
>   
> @@ -3014,7 +3014,7 @@ static struct gdsc pcie_0_phy_gdsc = {
>   	.pd = {
>   		.name = "pcie_0_phy_gdsc",
>   	},
> -	.pwrsts = PWRSTS_OFF_ON,
> +	.pwrsts = PWRSTS_RET_ON,
>   	.flags = VOTABLE | POLL_CFG_GDSCR | RETAIN_FF_ENABLE,
>   };
>   
> @@ -3025,7 +3025,7 @@ static struct gdsc pcie_1_gdsc = {
>   	.pd = {
>   		.name = "pcie_1_gdsc",
>   	},
> -	.pwrsts = PWRSTS_OFF_ON,
> +	.pwrsts = PWRSTS_RET_ON,
>   	.flags = VOTABLE | POLL_CFG_GDSCR | RETAIN_FF_ENABLE,
>   };
>   
> @@ -3036,7 +3036,7 @@ static struct gdsc pcie_1_phy_gdsc = {
>   	.pd = {
>   		.name = "pcie_1_phy_gdsc",
>   	},
> -	.pwrsts = PWRSTS_OFF_ON,
> +	.pwrsts = PWRSTS_RET_ON,
>   	.flags = VOTABLE | POLL_CFG_GDSCR | RETAIN_FF_ENABLE,
>   };
>   

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on QRD8550