[PATCH] drm/amd/pm: fix the return value of pm message

[Huang Rui]

On Wed, Jan 13, 2021 at 09:45:31AM +0800, Feng, Kenneth wrote:
> [AMD Official Use Only - Internal Distribution Only]
> 
> This can fix the problem of the below commit.
> But I'm not sure what is the real purpose of the below commit. Or can we revert it?

We perfer to print firmware return values like below:

#define SMC_Status_BUSY                0x0
#define SMC_Result_OK                  0x1
#define SMC_Result_Failed              0xFF
#define SMC_Result_UnknownCmd          0xFE
#define SMC_Result_CmdRejectedPrereq   0xFD
#define SMC_Result_CmdRejectedBusy     0xFC

dev_err(adev->dev, "failed send message: %10s (%d) \tparam: 0x%08x response %#x\n",
        smu_get_message_name(smu, msg),
        index, param, ret);

-EIO is not very useful on debugging.

Thanks,
Ray

> Thanks.
> commit 72a33b4b7433780df5334f9cfb23ff51669431a0
> Author: Huang Rui <ray.huang at amd.com>
> Date:   Fri Jan 8 16:27:15 2021 +0800
> 
>     drm/amd/pm: enhance the real response for smu message (v2)
> 
>     The user prefers to know the real response value from C2PMSG 90 register
>     which is written by firmware not -EIO.
> 
>     v2: return C2PMSG 90 value
> 
>     Signed-off-by: Huang Rui <ray.huang at amd.com>
>     Reviewed-by: Evan Quan <evan.quan at amd.com>
> 
> Best Regards
> Kenneth
> 
> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Huang Rui
> Sent: Tuesday, January 12, 2021 6:25 PM
> To: amd-gfx at lists.freedesktop.org
> Cc: Du, Xiaojian <Xiaojian.Du at amd.com>; Huang, Ray <Ray.Huang at amd.com>; Liu, Aaron <Aaron.Liu at amd.com>; Hou, Xiaomeng (Matthew) <Xiaomeng.Hou at amd.com>; Deucher, Alexander <Alexander.Deucher at amd.com>; Quan, Evan <Evan.Quan at amd.com>
> Subject: [PATCH] drm/amd/pm: fix the return value of pm message
> 
> [CAUTION: External Email]
> 
> 0 should be right driver return value, 0x1 is the right firmware return value. So switch to 0 at last.
> 
> Signed-off-by: Huang Rui <ray.huang at amd.com>
> ---
>  drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c b/drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c
> index d7d86fd79e1f..41d5c65a2f21 100644
> --- a/drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c
> +++ b/drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c
> @@ -149,6 +149,7 @@ int smu_cmn_send_smc_msg_with_param(struct smu_context *smu,
>         if (read_arg)
>                 smu_cmn_read_arg(smu, read_arg);
> 
> +       ret = 0; /* 0 as driver return value */
>  out:
>         mutex_unlock(&smu->message_lock);
>         return ret;
> --
> 2.25.1
> 
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