linux-kernel - Re: [PATCH] drm/msm/a5xx: Add support for Adreno 506 GPU

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Date:   Sun, 12 Dec 2021 14:16:01 +0000
From:   Vladimir Lypak <vladimir.lypak@...il.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jordan Crouse <jordan@...micpenguin.net>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        "Kristian H. Kristensen" <hoegsberg@...gle.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Akhil P Oommen <akhilpo@...eaurora.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Iskren Chernev <iskren.chernev@...il.com>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/a5xx: Add support for Adreno 506 GPU

On Fri, Oct 22, 2021 at 10:33:29AM -0700, Bjorn Andersson wrote:
> On Fri 22 Oct 04:43 PDT 2021, Vladimir Lypak wrote:
> 
> > This GPU is found on SoCs such as MSM8953(650MHz), SDM450(600MHz),
> > SDM632(725MHz).
> > 
> > Signed-off-by: Vladimir Lypak <vladimir.lypak@...il.com>
> > ---
> >  drivers/gpu/drm/msm/adreno/a5xx_gpu.c      | 34 ++++++++++++++--------
> >  drivers/gpu/drm/msm/adreno/adreno_device.c | 18 ++++++++++++
> >  drivers/gpu/drm/msm/adreno/adreno_gpu.h    |  5 ++++
> >  3 files changed, 45 insertions(+), 12 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> > index 5e2750eb3810..249a0d8bc673 100644
> > --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> > +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> > @@ -441,7 +441,7 @@ void a5xx_set_hwcg(struct msm_gpu *gpu, bool state)
> >  	const struct adreno_five_hwcg_regs *regs;
> >  	unsigned int i, sz;
> >  
> > -	if (adreno_is_a508(adreno_gpu)) {
> > +	if (adreno_is_a506(adreno_gpu) || adreno_is_a508(adreno_gpu)) {
> >  		regs = a50x_hwcg;
> >  		sz = ARRAY_SIZE(a50x_hwcg);
> >  	} else if (adreno_is_a509(adreno_gpu) || adreno_is_a512(adreno_gpu)) {
> > @@ -485,7 +485,7 @@ static int a5xx_me_init(struct msm_gpu *gpu)
> >  	OUT_RING(ring, 0x00000000);
> >  
> >  	/* Specify workarounds for various microcode issues */
> > -	if (adreno_is_a530(adreno_gpu)) {
> > +	if (adreno_is_a506(adreno_gpu) || adreno_is_a530(adreno_gpu)) {
> >  		/* Workaround for token end syncs
> >  		 * Force a WFI after every direct-render 3D mode draw and every
> >  		 * 2D mode 3 draw
> > @@ -620,8 +620,17 @@ static int a5xx_ucode_init(struct msm_gpu *gpu)
> >  
> >  static int a5xx_zap_shader_resume(struct msm_gpu *gpu)
> >  {
> > +	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> >  	int ret;
> >  
> > +	/*
> > +	 * Adreno 506,508,512 have CPZ Retention feature and
> > +	 * don't need to resume zap shader
> > +	 */
> > +	if (adreno_is_a506(adreno_gpu) || adreno_is_a508(adreno_gpu) ||
> > +	    adreno_is_a512(adreno_gpu))
> > +		return 0;
> 
> Afaict all other changes in the patch adds a506 support, but this hunk
> changes a508 and a512 behavior.
> 
> I'm not saying that the change is wrong, but this hunk deserves to be in
> it's own patch - so that if there's any impact on those other versions
> it can be tracked down to that specific patch.
> 
> Thanks,
> Bjorn

Hello, Bjorn.

You're right on that. I'm going to remove those changes in V2, since
that SCM call only causes problems on A506 and i can't test it on other
GPUs.

Best regards,
Vladimir