linux-kernel - Re: [PATCH v1 2/3] drm/msm/adreno: Add support for X185 GPU

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Message-ID: <20240626205234.ivk5xszi375sl6fe@hu-akhilpo-hyd.qualcomm.com>
Date: Thu, 27 Jun 2024 02:22:34 +0530
From: Akhil P Oommen <quic_akhilpo@...cinc.com>
To: Rob Clark <robdclark@...il.com>
CC: Konrad Dybcio <konrad.dybcio@...aro.org>,
        freedreno
	<freedreno@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...il.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        Sean Paul <sean@...rly.run>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/3] drm/msm/adreno: Add support for X185 GPU

On Wed, Jun 26, 2024 at 11:43:08AM -0700, Rob Clark wrote:
> On Wed, Jun 26, 2024 at 1:24 AM Akhil P Oommen <quic_akhilpo@...cinc.com> wrote:
> >
> > On Mon, Jun 24, 2024 at 03:53:48PM +0200, Konrad Dybcio wrote:
> > >
> > >
> > > On 6/23/24 13:06, Akhil P Oommen wrote:
> > > > Add support in drm/msm driver for the Adreno X185 gpu found in
> > > > Snapdragon X1 Elite chipset.
> > > >
> > > > Signed-off-by: Akhil P Oommen <quic_akhilpo@...cinc.com>
> > > > ---
> > > >
> > > >   drivers/gpu/drm/msm/adreno/a6xx_gmu.c      | 19 +++++++++++++++----
> > > >   drivers/gpu/drm/msm/adreno/a6xx_gpu.c      |  6 ++----
> > > >   drivers/gpu/drm/msm/adreno/adreno_device.c | 14 ++++++++++++++
> > > >   drivers/gpu/drm/msm/adreno/adreno_gpu.h    |  5 +++++
> > > >   4 files changed, 36 insertions(+), 8 deletions(-)
> > > >
> > > > diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > > > index 0e3dfd4c2bc8..168a4bddfaf2 100644
> > > > --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > > > +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > > > @@ -830,8 +830,10 @@ static int a6xx_gmu_fw_start(struct a6xx_gmu *gmu, unsigned int state)
> > > >      */
> > > >     gmu_write(gmu, REG_A6XX_GMU_CM3_CFG, 0x4052);
> > > > +   if (adreno_is_x185(adreno_gpu)) {
> > > > +           chipid = 0x7050001;
> > >
> > > What's wrong with using the logic below?
> >
> > patchid is BITS(7, 0), not (15, 8) in the case of x185. Due to the
> > changes in the chipid scheme within the a7x family, this is a bit
> > confusing. I will try to improve here in another series.
> 
> I'm thinking we should just add gmu_chipid to struct a6xx_info, tbh
> 
> Maybe to start with, we can fall back to the existing logic if
> a6xx_info::gmu_chipid is zero so we don't have to add it for _every_
> a6xx/a7xx

Agree, I was thinking the same.

-Akhil.
> 
> BR,
> -R
> 
> > >
> > > >     /* NOTE: A730 may also fall in this if-condition with a future GMU fw update. */
> > > > -   if (adreno_is_a7xx(adreno_gpu) && !adreno_is_a730(adreno_gpu)) {
> > > > +   } else if (adreno_is_a7xx(adreno_gpu) && !adreno_is_a730(adreno_gpu)) {
> > > >             /* A7xx GPUs have obfuscated chip IDs. Use constant maj = 7 */
> > > >             chipid = FIELD_PREP(GENMASK(31, 24), 0x7);
> > > > @@ -1329,9 +1331,18 @@ static int a6xx_gmu_rpmh_arc_votes_init(struct device *dev, u32 *votes,
> > > >     if (!pri_count)
> > > >             return -EINVAL;
> > > > -   sec = cmd_db_read_aux_data("mx.lvl", &sec_count);
> > > > -   if (IS_ERR(sec))
> > > > -           return PTR_ERR(sec);
> > > > +   /*
> > > > +    * Some targets have a separate gfx mxc rail. So try to read that first and then fall back
> > > > +    * to regular mx rail if it is missing
> > > > +    */
> > > > +   sec = cmd_db_read_aux_data("gmxc.lvl", &sec_count);
> > > > +   if (PTR_ERR_OR_ZERO(sec) == -EPROBE_DEFER) {
> > > > +           return -EPROBE_DEFER;
> > > > +   } else if (IS_ERR(sec)) {
> > > > +           sec = cmd_db_read_aux_data("mx.lvl", &sec_count);
> > > > +           if (IS_ERR(sec))
> > > > +                   return PTR_ERR(sec);
> > > > +   }
> > >
> > > I assume GMXC would always be used if present, although please use the
> > > approach Dmitry suggested
> >
> > Correct.
> >
> > -Akhil
> > >
> > >
> > > The rest looks good!
> > >
> > > Konrad