linux-kernel - Re: [PATCH 3/5] drm/msm: mdss: Add QCS8300 support

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Message-ID: <CAA8EJprGLfa2H1VMAG7uYJOEUyf9aMbC9-V6Q_J-pDz4pGV1yQ@mail.gmail.com>
Date: Fri, 29 Nov 2024 15:37:35 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Yongxing Mou <quic_yongmou@...cinc.com>
Cc: Ritesh Kumar <quic_riteshk@...cinc.com>, Rob Clark <robdclark@...il.com>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konradybcio@...nel.org>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] drm/msm: mdss: Add QCS8300 support

On Fri, 29 Nov 2024 at 11:56, Yongxing Mou <quic_yongmou@...cinc.com> wrote:
>
>
>
> On 2024/11/27 21:46, Dmitry Baryshkov wrote:
> > On Wed, Nov 27, 2024 at 03:05:03PM +0800, Yongxing Mou wrote:
> >> Add Mobile Display Subsystem (MDSS) support for the QCS8300 platform.
> >
> > Please mention, why do you need it at all. I see that the UBWC swizzle
> > and HBB settings are different. Is this really the case? Is it because
> > of the different memory being used on those platforms?
> >
> Thanks, will modify the comment to add more information .QCS8300 UBWC
> setting is quite different with SA8775P,it use different memory,so their
> recommended configurations are not quite the same.this is really setting.

We had several cases where the platform should be using different HBB
if it uses different memory type. Is that the case here? If so, rather
than adding another compat entry please extend the msm_mdss to read
memory type and select HBB based on that. This will also fix several
TODO items in the driver.

As a side note, I see that your config has different ubwc_swizzle. If
that's actually different, then maybe you are right and there should
be a separate entry.

> >>
> >> Signed-off-by: Yongxing Mou <quic_yongmou@...cinc.com>
> >> ---
> >>   drivers/gpu/drm/msm/msm_mdss.c | 11 +++++++++++
> >>   1 file changed, 11 insertions(+)
> >>
> >> diff --git a/drivers/gpu/drm/msm/msm_mdss.c b/drivers/gpu/drm/msm/msm_mdss.c
> >> index b7bd899ead44bf86998e7295bccb31a334fa6811..90d8fe469d3134ec73f386153509ac257d75930a 100644
> >> --- a/drivers/gpu/drm/msm/msm_mdss.c
> >> +++ b/drivers/gpu/drm/msm/msm_mdss.c
> >> @@ -568,6 +568,16 @@ static const struct msm_mdss_data qcm2290_data = {
> >>      .reg_bus_bw = 76800,
> >>   };
> >>
> >> +static const struct msm_mdss_data qcs8300_data = {
> >> +    .ubwc_enc_version = UBWC_4_0,
> >> +    .ubwc_dec_version = UBWC_4_0,
> >> +    .ubwc_swizzle = 6,
> >> +    .ubwc_static = 1,
> >> +    .highest_bank_bit = 3,
> >> +    .macrotile_mode = 1,
> >> +    .reg_bus_bw = 74000,
> >> +};
> >> +
> >>   static const struct msm_mdss_data sa8775p_data = {
> >>      .ubwc_enc_version = UBWC_4_0,
> >>      .ubwc_dec_version = UBWC_4_0,
> >> @@ -715,6 +725,7 @@ static const struct of_device_id mdss_dt_match[] = {
> >>      { .compatible = "qcom,mdss" },
> >>      { .compatible = "qcom,msm8998-mdss", .data = &msm8998_data },
> >>      { .compatible = "qcom,qcm2290-mdss", .data = &qcm2290_data },
> >> +    { .compatible = "qcom,qcs8300-mdss", .data = &qcs8300_data },
> >>      { .compatible = "qcom,sa8775p-mdss", .data = &sa8775p_data },
> >>      { .compatible = "qcom,sdm670-mdss", .data = &sdm670_data },
> >>      { .compatible = "qcom,sdm845-mdss", .data = &sdm845_data },
> >>
> >> --
> >> 2.34.1
> >>
> >
>


-- 
With best wishes
Dmitry