linux-kernel - Re: [PATCH 09/15] drm/msm/mdss: Add SM6125 support

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Message-ID: <222mwmijir3tv7lwxekp7r6jhx4uyhuo3xrtqec6oo3tj4kpyj@4pv56oukezsg>
Date:   Tue, 27 Jun 2023 11:06:29 +0200
From:   Marijn Suijten <marijn.suijten@...ainline.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Krishna Manikandan <quic_mkrishn@...cinc.com>,
        ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-clk@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, Lux Aliaga <they@...t.lgbt>
Subject: Re: [PATCH 09/15] drm/msm/mdss: Add SM6125 support

On 2023-06-27 11:49:07, Dmitry Baryshkov wrote:
> On 24/06/2023 03:41, Marijn Suijten wrote:
> > SM6125's UBWC hardware decoder is version 3.0, and supports decoding
> > UBWC 1.0.
> 
> I think it's UBWC encoder version, see 
> https://git.codelinaro.org/clo/la/platform/vendor/opensource/display-drivers/-/blob/display-kernel.lnx.5.15.1.r17-rel/msm/sde/sde_hw_top.c?ref_type=heads#L357
> 
> This is a part of 
> https://patchwork.freedesktop.org/patch/538279/?series=118074&rev=1
> 
> (no, you don't have to rebase on that patchset, it is not reviewed yet).

Thanks for clarifying this.  I always thought that there only was a
(decoder) hardware version, that is able to decode a specific format
version of the UBWC data format.  And that it was confusingly using the
same enum.

I will reword the message.

(Also didn't really see why MDSS would have to _encode_ to UBWC, for
 readbacks?)

- Marijn

> > Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> > ---
> >   drivers/gpu/drm/msm/msm_mdss.c | 8 ++++++++
> >   1 file changed, 8 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/msm/msm_mdss.c b/drivers/gpu/drm/msm/msm_mdss.c
> > index 05648c910c68..bf68bae23264 100644
> > --- a/drivers/gpu/drm/msm/msm_mdss.c
> > +++ b/drivers/gpu/drm/msm/msm_mdss.c
> > @@ -559,6 +559,13 @@ static const struct msm_mdss_data sm6115_data = {
> >   	.ubwc_static = 0x11f,
> >   };
> >   
> > +static const struct msm_mdss_data sm6125_data = {
> > +	.ubwc_version = UBWC_1_0,
> > +	.ubwc_dec_version = UBWC_3_0,
> > +	.ubwc_swizzle = 1,
> > +	.highest_bank_bit = 1,
> > +};
> > +
> >   static const struct msm_mdss_data sm8250_data = {
> >   	.ubwc_version = UBWC_4_0,
> >   	.ubwc_dec_version = UBWC_4_0,
> > @@ -579,6 +586,7 @@ static const struct of_device_id mdss_dt_match[] = {
> >   	{ .compatible = "qcom,sc8180x-mdss", .data = &sc8180x_data },
> >   	{ .compatible = "qcom,sc8280xp-mdss", .data = &sc8280xp_data },
> >   	{ .compatible = "qcom,sm6115-mdss", .data = &sm6115_data },
> > +	{ .compatible = "qcom,sm6125-mdss", .data = &sm6125_data },
> >   	{ .compatible = "qcom,sm6350-mdss", .data = &sm6350_data },
> >   	{ .compatible = "qcom,sm6375-mdss", .data = &sm6350_data },
> >   	{ .compatible = "qcom,sm8150-mdss", .data = &sm8150_data },
> > 
> 
> -- 
> With best wishes
> Dmitry
>