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Message-ID: <38030486-f08a-33e6-f8d1-3f4de379a75b@linaro.org>
Date:   Thu, 20 Apr 2023 03:01:28 +0200
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Subject: Re: [PATCH v2 11/17] drm/msm/dpu: Disable MDP vsync source selection
 on DPU 5.0.0 and above
Content-Language: en-US
To:     Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Marijn Suijten <marijn.suijten@somainline.org>,
        Rob Clark <robdclark@gmail.com>,
        Abhinav Kumar <quic_abhinavk@quicinc.com>,
        Sean Paul <sean@poorly.run>, David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Adam Skladowski <a39.skl@gmail.com>,
        Loic Poulain <loic.poulain@linaro.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Kuogee Hsieh <quic_khsieh@quicinc.com>,
        Robert Foss <rfoss@kernel.org>, Vinod Koul <vkoul@kernel.org>,
        Rajesh Yadav <ryadav@codeaurora.org>,
        Jeykumar Sankaran <jsanka@codeaurora.org>,
        Neil Armstrong <neil.armstrong@linaro.org>,
        Chandan Uddaraju <chandanu@codeaurora.org>
Cc:     ~postmarketos/upstreaming@lists.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@somainline.org>,
        Martin Botka <martin.botka@somainline.org>,
        Jami Kettunen <jami.kettunen@somainline.org>,
        linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
        freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        Jordan Crouse <jordan@cosmicpenguin.net>,
        Archit Taneja <architt@codeaurora.org>,
        Sravanthi Kollukuduru <skolluku@codeaurora.org>
References: <20230411-dpu-intf-te-v2-0-ef76c877eb97@somainline.org>
 <20230411-dpu-intf-te-v2-11-ef76c877eb97@somainline.org>
 <20fab838-e05b-163d-aa72-bd8235df9f2c@linaro.org>
From:   Konrad Dybcio <konrad.dybcio@linaro.org>
In-Reply-To: <20fab838-e05b-163d-aa72-bd8235df9f2c@linaro.org>
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Precedence: bulk


On 20.04.2023 03:00, Dmitry Baryshkov wrote:
> On 17/04/2023 23:21, 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@somainline.org>
>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
>> ---
>>   .../drm/msm/disp/dpu1/catalog/dpu_3_0_msm8998.h    |  2 +-
>>   .../gpu/drm/msm/disp/dpu1/catalog/dpu_4_0_sdm845.h |  2 +-
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h     |  3 ++
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_top.c         | 52 +++++++++++++++-------
>>   4 files changed, 41 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_3_0_msm8998.h b/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_3_0_msm8998.h
>> index b7845591c384..6906f8046b9e 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_3_0_msm8998.h
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_3_0_msm8998.h
>> @@ -30,7 +30,7 @@ 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),
>>       .clk_ctrls[DPU_CLK_CTRL_VIG0] = { .reg_off = 0x2ac, .bit_off = 0 },
>>       .clk_ctrls[DPU_CLK_CTRL_VIG1] = { .reg_off = 0x2b4, .bit_off = 0 },
>>       .clk_ctrls[DPU_CLK_CTRL_VIG2] = { .reg_off = 0x2bc, .bit_off = 0 },
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_4_0_sdm845.h b/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_4_0_sdm845.h
>> index 5b9b3b99f1b5..14ce397800d5 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_4_0_sdm845.h
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_4_0_sdm845.h
>> @@ -30,7 +30,7 @@ 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),
>>       .clk_ctrls[DPU_CLK_CTRL_VIG0] = { .reg_off = 0x2ac, .bit_off = 0 },
>>       .clk_ctrls[DPU_CLK_CTRL_VIG1] = { .reg_off = 0x2b4, .bit_off = 0 },
>>       .clk_ctrls[DPU_CLK_CTRL_VIG2] = { .reg_off = 0x2bc, .bit_off = 0 },
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
>> index 71584cd56fd7..599e177b89dd 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
>> @@ -48,6 +48,8 @@ enum {
>>    * @DPU_MDP_UBWC_1_5,      Universal Bandwidth compression version 1.5
>>    * @DPU_MDP_PERIPH_0_REMOVED Indicates that access to periph top0 block results
>>    *               in a failure
>> + * @DPU_MDP_VSYNC_SEL      Enables vsync source selection via MDP_VSYNC_SEL register
>> + *                         (moved into INTF block since DPU 5.0.0)
>>    * @DPU_MDP_MAX            Maximum value
>>      */
>> @@ -59,6 +61,7 @@ enum {
>>       DPU_MDP_UBWC_1_5,
>>       DPU_MDP_AUDIO_SELECT,
>>       DPU_MDP_PERIPH_0_REMOVED,
>> +    DPU_MDP_VSYNC_SEL,
>>       DPU_MDP_MAX
>>   };
>>   diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_top.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_top.c
>> index 2bb02e17ee52..9ea15a647a66 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_top.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_top.c
>> @@ -126,28 +126,16 @@ static void dpu_hw_get_danger_status(struct dpu_hw_mdp *mdp,
>>       status->sspp[SSPP_CURSOR1] = (value >> 26) & 0x3;
>>   }
>>   -static void dpu_hw_setup_vsync_source(struct dpu_hw_mdp *mdp,
>> +static void dpu_hw_setup_vsync_source_v1(struct dpu_hw_mdp *mdp,
>>           struct dpu_vsync_source_cfg *cfg)
> 
> In my opinion _v1 is not really descriptive here. Could you please rename it to dpu_hw_setup_vsync_source_no_vsync_sel() ?
v1 refers to the CTL rev 100 a.k.a 1.0.0 a.k.a 1, but that's not
yet very well formulated upstream.. if we even need it..

Konrad
> 
> Or maybe rename dpu_hw_setup_vsync_source() to dpu_hw_setup_vsync_source_vsync_sel() and drop _v1 from this function.
> 
> Up to you.
> 
> 
>>   {
>>       struct dpu_hw_blk_reg_map *c;
>> -    u32 reg, wd_load_value, wd_ctl, wd_ctl2, i;
>> -    static const u32 pp_offset[PINGPONG_MAX] = {0xC, 0x8, 0x4, 0x13, 0x18};
>> +    u32 reg, wd_load_value, wd_ctl, wd_ctl2;
>>   -    if (!mdp || !cfg || (cfg->pp_count > ARRAY_SIZE(cfg->ppnumber)))
>> +    if (!mdp || !cfg)
>>           return;
>>         c = &mdp->hw;
>> -    reg = DPU_REG_READ(c, MDP_VSYNC_SEL);
>> -    for (i = 0; i < cfg->pp_count; i++) {
>> -        int pp_idx = cfg->ppnumber[i] - PINGPONG_0;
>> -
>> -        if (pp_idx >= ARRAY_SIZE(pp_offset))
>> -            continue;
>> -
>> -        reg &= ~(0xf << pp_offset[pp_idx]);
>> -        reg |= (cfg->vsync_source & 0xf) << pp_offset[pp_idx];
>> -    }
>> -    DPU_REG_WRITE(c, MDP_VSYNC_SEL, reg);
>>         if (cfg->vsync_source >= DPU_VSYNC_SOURCE_WD_TIMER_4 &&
>>               cfg->vsync_source <= DPU_VSYNC_SOURCE_WD_TIMER_0) {
>> @@ -194,6 +182,33 @@ static void dpu_hw_setup_vsync_source(struct dpu_hw_mdp *mdp,
>>       }
>>   }
>>   +static void dpu_hw_setup_vsync_source(struct dpu_hw_mdp *mdp,
>> +        struct dpu_vsync_source_cfg *cfg)
>> +{
>> +    struct dpu_hw_blk_reg_map *c;
>> +    u32 reg, i;
>> +    static const u32 pp_offset[PINGPONG_MAX] = {0xC, 0x8, 0x4, 0x13, 0x18};
>> +
>> +    if (!mdp || !cfg || (cfg->pp_count > ARRAY_SIZE(cfg->ppnumber)))
>> +        return;
>> +
>> +    c = &mdp->hw;
>> +
>> +    reg = DPU_REG_READ(c, MDP_VSYNC_SEL);
>> +    for (i = 0; i < cfg->pp_count; i++) {
>> +        int pp_idx = cfg->ppnumber[i] - PINGPONG_0;
>> +
>> +        if (pp_idx >= ARRAY_SIZE(pp_offset))
>> +            continue;
>> +
>> +        reg &= ~(0xf << pp_offset[pp_idx]);
>> +        reg |= (cfg->vsync_source & 0xf) << pp_offset[pp_idx];
>> +    }
>> +    DPU_REG_WRITE(c, MDP_VSYNC_SEL, reg);
>> +
>> +    dpu_hw_setup_vsync_source_v1(mdp, cfg);
>> +}
>> +
>>   static void dpu_hw_get_safe_status(struct dpu_hw_mdp *mdp,
>>           struct dpu_danger_safe_status *status)
>>   {
>> @@ -241,7 +256,12 @@ static void _setup_mdp_ops(struct dpu_hw_mdp_ops *ops,
>>       ops->setup_split_pipe = dpu_hw_setup_split_pipe;
>>       ops->setup_clk_force_ctrl = dpu_hw_setup_clk_force_ctrl;
>>       ops->get_danger_status = dpu_hw_get_danger_status;
>> -    ops->setup_vsync_source = dpu_hw_setup_vsync_source;
>> +
>> +    if (cap & BIT(DPU_MDP_VSYNC_SEL))
>> +        ops->setup_vsync_source = dpu_hw_setup_vsync_source;
>> +    else
>> +        ops->setup_vsync_source = dpu_hw_setup_vsync_source_v1;
>> +
>>       ops->get_safe_status = dpu_hw_get_safe_status;
>>         if (cap & BIT(DPU_MDP_AUDIO_SELECT))
>>
>