linux-kernel - Re: [PATCH 1/2] drm/msm/a6xx: Some reg64 conversion

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Date:   Mon, 20 Mar 2023 19:57:26 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org
Cc:     freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        Rob Clark <robdclark@...omium.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Chia-I Wu <olvaffe@...il.com>,
        Douglas Anderson <dianders@...omium.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] drm/msm/a6xx: Some reg64 conversion



On 20.03.2023 19:56, Konrad Dybcio wrote:
> 
> 
> On 20.03.2023 19:54, Rob Clark wrote:
>> From: Rob Clark <robdclark@...omium.org>
>>
>> The next generated header update will drop the _LO/_HI suffix, now that
>> the userspace tooling properly understands 64b vs 32b regs (and the _LO/
>> _HI workarounds are getting cleaned up).  So convert to using the 64b
>> reg helpers in prep.
>>
>> Signed-off-by: Rob Clark <robdclark@...omium.org>
>> ---
>>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 9 +++------
>>  1 file changed, 3 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
>> index 89049094a242..f26e258c6021 100644
>> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
>> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
>> @@ -1053,12 +1053,9 @@ static int hw_init(struct msm_gpu *gpu)
>>  	gpu_write(gpu, REG_A6XX_RBBM_PERFCTR_GPU_BUSY_MASKED, 0xffffffff);
>>  
>>  	/* Disable L2 bypass in the UCHE */
>> -	gpu_write(gpu, REG_A6XX_UCHE_WRITE_RANGE_MAX_LO, 0xffffffc0);
>> -	gpu_write(gpu, REG_A6XX_UCHE_WRITE_RANGE_MAX_HI, 0x0001ffff);
>> -	gpu_write(gpu, REG_A6XX_UCHE_TRAP_BASE_LO, 0xfffff000);
>> -	gpu_write(gpu, REG_A6XX_UCHE_TRAP_BASE_HI, 0x0001ffff);
>> -	gpu_write(gpu, REG_A6XX_UCHE_WRITE_THRU_BASE_LO, 0xfffff000);
>> -	gpu_write(gpu, REG_A6XX_UCHE_WRITE_THRU_BASE_HI, 0x0001ffff);
>> +	gpu_write64(gpu, REG_A6XX_UCHE_WRITE_RANGE_MAX_LO, 0x0001ffffffffffc0llu);
>> +	gpu_write64(gpu, REG_A6XX_UCHE_TRAP_BASE_LO, 0x0001fffffffff000llu);
>> +	gpu_write64(gpu, REG_A6XX_UCHE_WRITE_THRU_BASE_LO, 0x1fffffffff000llu);
> Any reason the last write dropped the leading zeroes?
> 
> Otherwise,
> 
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
Bah, thunderfox sent it from the wrong email. It still stands.

Konrad
> 
> Konrad
>>  
>>  	if (!adreno_is_a650_family(adreno_gpu)) {
>>  		/* Set the GMEM VA range [0x100000:0x100000 + gpu->gmem - 1] */