linux-kernel - Re: [PATCH] platform/x86: amd-pmc: Send command to dump data after clearing OS

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Date:   Tue, 28 Sep 2021 13:30:52 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Sanket Goswami <Sanket.Goswami@....com>, Shyam-sundar.S-k@....com,
        mgross@...ux.intel.com
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86: amd-pmc: Send command to dump data after
 clearing OS_HINT

Hi,

On 9/21/21 1:59 PM, Sanket Goswami wrote:
> It was reported that the resume stats received from the firmware are
> always zero. This happens because the SMU expects the driver to send the
> command to dump the log data after clearing the OS_HINT.
> 
> Adjust the order of the commands sent to SMU.
> 
> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@....com>
> Signed-off-by: Sanket Goswami <Sanket.Goswami@....com>

Thank you for your patch, I've applied this patch to my review-hans 
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Question, should I also submit this as a bug-fix for 5.15, or
can this wait for the 5.16 cycle ?

Regards,

Hans


> ---
>  drivers/platform/x86/amd-pmc.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/x86/amd-pmc.c b/drivers/platform/x86/amd-pmc.c
> index 91c1f1c6c929..bc7c4498067b 100644
> --- a/drivers/platform/x86/amd-pmc.c
> +++ b/drivers/platform/x86/amd-pmc.c
> @@ -436,14 +436,14 @@ static int __maybe_unused amd_pmc_resume(struct device *dev)
>  	int rc;
>  	u8 msg;
>  
> -	/* Let SMU know that we are looking for stats */
> -	amd_pmc_send_cmd(pdev, 0, NULL, SMU_MSG_LOG_DUMP_DATA, 0);
> -
>  	msg = amd_pmc_get_os_hint(pdev);
>  	rc = amd_pmc_send_cmd(pdev, 0, NULL, msg, 0);
>  	if (rc)
>  		dev_err(pdev->dev, "resume failed\n");
>  
> +	/* Let SMU know that we are looking for stats */
> +	amd_pmc_send_cmd(pdev, 0, NULL, SMU_MSG_LOG_DUMP_DATA, 0);
> +
>  	/* Dump the IdleMask to see the blockers */
>  	amd_pmc_idlemask_read(pdev, dev, NULL);
>  
>