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Message-ID: <20fab838-e05b-163d-aa72-bd8235df9f2c@linaro.org>
Date: Thu, 20 Apr 2023 04:00:30 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Marijn Suijten <marijn.suijten@...ainline.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>,
Adam Skladowski <a39.skl@...il.com>,
Loic Poulain <loic.poulain@...aro.org>,
Bjorn Andersson <andersson@...nel.org>,
Kuogee Hsieh <quic_khsieh@...cinc.com>,
Robert Foss <rfoss@...nel.org>, Vinod Koul <vkoul@...nel.org>,
Rajesh Yadav <ryadav@...eaurora.org>,
Jeykumar Sankaran <jsanka@...eaurora.org>,
Neil Armstrong <neil.armstrong@...aro.org>,
Chandan Uddaraju <chandanu@...eaurora.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...ainline.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Martin Botka <martin.botka@...ainline.org>,
Jami Kettunen <jami.kettunen@...ainline.org>,
linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
Jordan Crouse <jordan@...micpenguin.net>,
Archit Taneja <architt@...eaurora.org>,
Sravanthi Kollukuduru <skolluku@...eaurora.org>
Subject: Re: [PATCH v2 11/17] drm/msm/dpu: Disable MDP vsync source selection
on DPU 5.0.0 and above
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@...ainline.org>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.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() ?
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))
>
--
With best wishes
Dmitry
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