linux-kernel - Re: [PATCH 02/17] drm/msm: a6xx: Refactor a6xx_sptprac

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Message-ID: <100ca94f-e1c1-4cc3-8282-a14066396f5a@oss.qualcomm.com>
Date: Thu, 24 Jul 2025 00:40:46 +0530
From: Akhil P Oommen <akhilpo@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Rob Clark <robin.clark@....qualcomm.com>, Sean Paul <sean@...rly.run>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/17] drm/msm: a6xx: Refactor a6xx_sptprac_enable()

On 7/23/2025 3:43 PM, Konrad Dybcio wrote:
> On 7/22/25 9:47 PM, Akhil P Oommen wrote:
>> On 7/22/2025 8:00 PM, Konrad Dybcio wrote:
>>> On 7/20/25 2:16 PM, Akhil P Oommen wrote:
>>>> A minor refactor to combine the subroutines for legacy a6xx GMUs under
>>>> a single check. This helps to avoid an unnecessary check and return
>>>> early from the subroutine for majority of a6xx gpus.
>>>>
>>>> Signed-off-by: Akhil P Oommen <akhilpo@....qualcomm.com>
>>>> ---
>>>>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 8 ++++----
>>>>  1 file changed, 4 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
>>>> index 38c0f8ef85c3d260864541d83abe43e49c772c52..41129692d127b70e9293b82bea5ccb6b911b0bfb 100644
>>>> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
>>>> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
>>>> @@ -403,7 +403,10 @@ int a6xx_sptprac_enable(struct a6xx_gmu *gmu)
>>>>  	int ret;
>>>>  	u32 val;
>>>>  
>>>> -	if (!gmu->legacy)
>>>> +	WARN_ON(!gmu->legacy);
>>>> +
>>>> +	/* Nothing to do if GMU does the power management */
>>>> +	if (gmu->idle_level > GMU_IDLE_STATE_ACTIVE)
>>>
>>> This isn't quite a no-op, but I can't seem to find what the '1' value
>>> would map to, even in 845 kernel sources. Do we have to worry about it?
>>
>> This is fine. '1' seems to be a low power state that was removed very
>> early in the gmu firmware development stage. We can ignore that.
> 
> Ok, good - could you also add a define for it, perhaps something like:
> 
> #define GMU_IDLE_STATE_RESERVED 1 /* Cancelled feature, never exposed by fw */

Ack.

-Akhil

> 
> Konrad