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

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Message-ID: <9eab3246-9ae1-46bd-8058-aff7774820a6@linaro.org>
Date: Fri, 18 Apr 2025 15:23:22 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: qcom: gcc-sm8650: Do not turn off USB GDSCs during
 gdsc_disable()

Hi Bjorn,

On 05/03/2025 20:00, Neil Armstrong wrote:
> With PWRSTS_OFF_ON, USB GDSCs are turned off during gdsc_disable(). This
> can happen during scenarios such as system suspend and breaks the resume
> of USB controller 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.
> 
> Fixes: c58225b7e3d7 ("clk: qcom: add the SM8650 Global Clock Controller driver, part 1")
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>   drivers/clk/qcom/gcc-sm8650.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/qcom/gcc-sm8650.c b/drivers/clk/qcom/gcc-sm8650.c
> index 9dd5c48f33bed5b944a0b25959ef69e7862d0449..fa1672c4e7d814e1e08c79f9cda9463bf1cd1598 100644
> --- a/drivers/clk/qcom/gcc-sm8650.c
> +++ b/drivers/clk/qcom/gcc-sm8650.c
> @@ -3497,7 +3497,7 @@ static struct gdsc usb30_prim_gdsc = {
>   	.pd = {
>   		.name = "usb30_prim_gdsc",
>   	},
> -	.pwrsts = PWRSTS_OFF_ON,
> +	.pwrsts = PWRSTS_RET_ON,
>   	.flags = POLL_CFG_GDSCR | RETAIN_FF_ENABLE,
>   };
>   
> @@ -3506,7 +3506,7 @@ static struct gdsc usb3_phy_gdsc = {
>   	.pd = {
>   		.name = "usb3_phy_gdsc",
>   	},
> -	.pwrsts = PWRSTS_OFF_ON,
> +	.pwrsts = PWRSTS_RET_ON,
>   	.flags = POLL_CFG_GDSCR | RETAIN_FF_ENABLE,
>   };
>   
> 
> ---
> base-commit: 7ec162622e66a4ff886f8f28712ea1b13069e1aa
> change-id: 20250305-topic-sm8650-upstream-fix-usb-suspend-20979d5a0170
> 
> Best regards,

Gentle ping !

Neil