linux-kernel - Re: [RFC PATCH 3/7] drm/msm/dpu: Disable MDP vsync source selection on DPU 5.0.0 and above

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Date:   Mon, 2 Jan 2023 11:18:12 +0100
From:   Marijn Suijten <marijn.suijten@...ainline.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     phone-devel@...r.kernel.org,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Stephen Boyd <swboyd@...omium.org>,
        Vinod Koul <vkoul@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Jessica Zhang <quic_jesszhan@...cinc.com>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        Vinod Polimera <quic_vpolimer@...cinc.com>,
        Adam Skladowski <a39.skl@...il.com>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Kalyan Thota <quic_kalyant@...cinc.com>
Subject: Re: [RFC PATCH 3/7] drm/msm/dpu: Disable MDP vsync source selection
 on DPU 5.0.0 and above

On 2023-01-02 10:30:58, Konrad Dybcio wrote:
> 
> 
> On 31.12.2022 22:52, Marijn Suijten wrote:
> > On 2022-12-31 22:50:02, Marijn Suijten wrote:
> >> Since hardware revision 5.0.0 the TE configuration moved out of the
> >> PINGPONG block into the INTF block, including vsync source selection
> >> that was previously part of MDP top.  Writing to the MDP_VSYNC_SEL
> >> register has no effect anymore and is omitted downstream via the
> >> DPU/SDE_MDP_VSYNC_SEL feature flag.  This flag is only added to INTF
> >> blocks used by hardware prior to 5.0.0.
> >>
> >> The code that writes to these registers in the INTF block will follow in
> >> subsequent patches.
> >>
> >> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> >> ---
> >>  .../gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c    | 33 ++++++++++--
> >>  .../gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h    |  1 +
> >>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_top.c    | 52 +++++++++++++------
> >>  3 files changed, 66 insertions(+), 20 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> >> index 39d4b293710c..1cfe94494135 100644
> >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> >> @@ -407,7 +407,7 @@ static const struct dpu_mdp_cfg msm8998_mdp[] = {
> >>  	{
> >>  	.name = "top_0", .id = MDP_TOP,
> >>  	.base = 0x0, .len = 0x458,
> >> -	.features = 0,
> >> +	.features = BIT(DPU_MDP_VSYNC_SEL),
> >>  	.highest_bank_bit = 0x2,
> >>  	.clk_ctrls[DPU_CLK_CTRL_VIG0] = {
> >>  			.reg_off = 0x2AC, .bit_off = 0},
> >> @@ -436,7 +436,7 @@ static const struct dpu_mdp_cfg sdm845_mdp[] = {
> >>  	{
> >>  	.name = "top_0", .id = MDP_TOP,
> >>  	.base = 0x0, .len = 0x45C,
> >> -	.features = BIT(DPU_MDP_AUDIO_SELECT),
> >> +	.features = BIT(DPU_MDP_AUDIO_SELECT) | BIT(DPU_MDP_VSYNC_SEL),
> >>  	.highest_bank_bit = 0x2,
> >>  	.clk_ctrls[DPU_CLK_CTRL_VIG0] = {
> >>  			.reg_off = 0x2AC, .bit_off = 0},
> >> @@ -512,6 +512,31 @@ static const struct dpu_mdp_cfg sm6115_mdp[] = {
> >>  	},
> >>  };
> >>  
> >> +static const struct dpu_mdp_cfg sdm8150_mdp[] = {
> > 
> > Sometimes it is only possible to spot such things _after_ sending,
> > probably the thing that makes us human :)
> > 
> > sm8150_mdp*, not sdm.
> > 
> > - Marijn
> > 
> >> +	{
> >> +	.name = "top_0", .id = MDP_TOP,
> >> +	.base = 0x0, .len = 0x45C,
> >> +	.features = BIT(DPU_MDP_AUDIO_SELECT),
> >> +	.highest_bank_bit = 0x2,
> >> +	.clk_ctrls[DPU_CLK_CTRL_VIG0] = {
> >> +			.reg_off = 0x2AC, .bit_off = 0},
> Keeping the hex values lowercase would be nice.

Ack, this was copied verbatim from sdm845_mdp but will cleanup as we go.
Looks like this file has a mixed approach towards lower and uppercase,
when does the normalization patch land?

- Marijn