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Date: Wed, 7 Dec 2022 15:08:32 +0100
From: Marijn Suijten <marijn.suijten@...ainline.org>
To: Kalyan Thota <quic_kalyant@...cinc.com>
Cc: dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, robdclark@...omium.org,
dianders@...omium.org, swboyd@...omium.org,
quic_vpolimer@...cinc.com, dmitry.baryshkov@...aro.org,
quic_abhinavk@...cinc.com
Subject: Re: [v10] drm/msm/disp/dpu1: add support for dspp sub block flush in
sc7280
On 2022-12-07 04:59:23, Kalyan Thota wrote:
> Flush mechanism for DSPP blocks has changed in sc7280 family, it
> allows individual sub blocks to be flushed in coordination with
> master flush control.
>
> Representation: master_flush && (PCC_flush | IGC_flush .. etc )
>
> This change adds necessary support for the above design.
>
> Changes in v1:
> - Few nits (Doug, Dmitry)
> - Restrict sub-block flush programming to dpu_hw_ctl file (Dmitry)
>
> Changes in v2:
> - Move the address offset to flush macro (Dmitry)
> - Seperate ops for the sub block flush (Dmitry)
>
> Changes in v3:
> - Reuse the DPU_DSPP_xx enum instead of a new one (Dmitry)
>
> Changes in v4:
> - Use shorter version for unsigned int (Stephen)
>
> Changes in v5:
> - Spurious patch please ignore.
>
> Changes in v6:
> - Add SOB tag (Doug, Dmitry)
>
> Changes in v7:
> - Cache flush mask per dspp (Dmitry)
> - Few nits (Marijn)
>
> Changes in v8:
> - Few nits (Marijn)
>
> Changes in v9:
> - use DSPP enum while accessing flush mask to make it readable (Dmitry)
> - Few nits (Dmitry)
>
> Changes in v10:
> - fix white spaces in a seperate patch (Dmitry)
>
> Signed-off-by: Kalyan Thota <quic_kalyant@...cinc.com>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 2 +-
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c | 5 ++-
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 4 +++
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c | 44 ++++++++++++++++++++++++--
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h | 5 ++-
> 5 files changed, 55 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 601d687..4170fbe 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -766,7 +766,7 @@ static void _dpu_crtc_setup_cp_blocks(struct drm_crtc *crtc)
>
> /* stage config flush mask */
> ctl->ops.update_pending_flush_dspp(ctl,
> - mixer[i].hw_dspp->idx);
> + mixer[i].hw_dspp->idx, DPU_DSPP_PCC);
> }
> }
>
> 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 27f029f..0eecb2f 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> @@ -65,7 +65,10 @@
> (PINGPONG_SDM845_MASK | BIT(DPU_PINGPONG_TE2))
>
> #define CTL_SC7280_MASK \
> - (BIT(DPU_CTL_ACTIVE_CFG) | BIT(DPU_CTL_FETCH_ACTIVE) | BIT(DPU_CTL_VM_CFG))
> + (BIT(DPU_CTL_ACTIVE_CFG) | \
> + BIT(DPU_CTL_FETCH_ACTIVE) | \
> + BIT(DPU_CTL_VM_CFG) | \
> + BIT(DPU_CTL_DSPP_SUB_BLOCK_FLUSH))
>
> #define MERGE_3D_SM8150_MASK (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 38aa38a..126ee37 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> @@ -161,10 +161,12 @@ enum {
> * DSPP sub-blocks
> * @DPU_DSPP_PCC Panel color correction block
> * @DPU_DSPP_GC Gamma correction block
> + * @DPU_DSPP_IGC Inverse gamma correction block
> */
> enum {
> DPU_DSPP_PCC = 0x1,
> DPU_DSPP_GC,
> + DPU_DSPP_IGC,
> DPU_DSPP_MAX
> };
>
> @@ -191,6 +193,7 @@ enum {
> * @DPU_CTL_SPLIT_DISPLAY: CTL supports video mode split display
> * @DPU_CTL_FETCH_ACTIVE: Active CTL for fetch HW (SSPPs)
> * @DPU_CTL_VM_CFG: CTL config to support multiple VMs
> + * @DPU_CTL_DSPP_BLOCK_FLUSH CTL config to support dspp sub-block flush
The above uses tabs, why does this use spaces?
> * @DPU_CTL_MAX
> */
> enum {
> @@ -198,6 +201,7 @@ enum {
> DPU_CTL_ACTIVE_CFG,
> DPU_CTL_FETCH_ACTIVE,
> DPU_CTL_VM_CFG,
> + DPU_CTL_DSPP_SUB_BLOCK_FLUSH,
> DPU_CTL_MAX
> };
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> index a35ecb6..e801be1 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> @@ -33,6 +33,7 @@
> #define CTL_INTF_FLUSH 0x110
> #define CTL_INTF_MASTER 0x134
> #define CTL_FETCH_PIPE_ACTIVE 0x0FC
> +#define CTL_DSPP_n_FLUSH(n) ((0x13C) + ((n) * 4))
>
> #define CTL_MIXER_BORDER_OUT BIT(24)
> #define CTL_FLUSH_MASK_CTL BIT(17)
> @@ -113,6 +114,9 @@ static inline void dpu_hw_ctl_clear_pending_flush(struct dpu_hw_ctl *ctx)
> trace_dpu_hw_ctl_clear_pending_flush(ctx->pending_flush_mask,
> dpu_hw_ctl_get_flush_register(ctx));
> ctx->pending_flush_mask = 0x0;
> +
> + memset(ctx->pending_dspp_flush_mask, 0,
> + sizeof(ctx->pending_dspp_flush_mask));
> }
>
> static inline void dpu_hw_ctl_update_pending_flush(struct dpu_hw_ctl *ctx,
> @@ -130,6 +134,8 @@ static u32 dpu_hw_ctl_get_pending_flush(struct dpu_hw_ctl *ctx)
>
> static inline void dpu_hw_ctl_trigger_flush_v1(struct dpu_hw_ctl *ctx)
> {
> + int dspp;
> +
> if (ctx->pending_flush_mask & BIT(MERGE_3D_IDX))
> DPU_REG_WRITE(&ctx->hw, CTL_MERGE_3D_FLUSH,
> ctx->pending_merge_3d_flush_mask);
> @@ -140,6 +146,11 @@ static inline void dpu_hw_ctl_trigger_flush_v1(struct dpu_hw_ctl *ctx)
> DPU_REG_WRITE(&ctx->hw, CTL_WB_FLUSH,
> ctx->pending_wb_flush_mask);
>
> + for(dspp = DSPP_0; dspp < DSPP_MAX; dspp++)
Space between for and (?
> + if (ctx->pending_dspp_flush_mask[dspp - DSPP_0])
> + DPU_REG_WRITE(&ctx->hw, CTL_DSPP_n_FLUSH(dspp - DSPP_0),
> + ctx->pending_dspp_flush_mask[dspp - DSPP_0]);
Shouldn't this loop as a whole check if _any_ DSPP flush is requested
via `pending_flush_mask & BIT(29)`? The other flushes don't check the
per-block mask value either (and could write zero that way) but only
base this check on the presence of a global flush mask for that block.
> +
> DPU_REG_WRITE(&ctx->hw, CTL_FLUSH, ctx->pending_flush_mask);
> }
>
> @@ -287,8 +298,9 @@ static void dpu_hw_ctl_update_pending_flush_merge_3d_v1(struct dpu_hw_ctl *ctx,
> }
>
> static void dpu_hw_ctl_update_pending_flush_dspp(struct dpu_hw_ctl *ctx,
> - enum dpu_dspp dspp)
> + enum dpu_dspp dspp, u32 dspp_sub_blk)
> {
> +
Empty line needed for?
> switch (dspp) {
> case DSPP_0:
> ctx->pending_flush_mask |= BIT(13);
> @@ -307,6 +319,30 @@ static void dpu_hw_ctl_update_pending_flush_dspp(struct dpu_hw_ctl *ctx,
> }
> }
>
> +static void dpu_hw_ctl_update_pending_flush_dspp_subblocks(
> + struct dpu_hw_ctl *ctx, enum dpu_dspp dspp, u32 dspp_sub_blk)
> +{
> +
And here?
> + if (dspp >= DSPP_MAX)
> + return;
> +
> + switch (dspp_sub_blk) {
> + case DPU_DSPP_IGC:
> + ctx->pending_dspp_flush_mask[dspp - DSPP_0] |= BIT(2);
> + break;
> + case DPU_DSPP_PCC:
> + ctx->pending_dspp_flush_mask[dspp - DSPP_0] |= BIT(4);
> + break;
> + case DPU_DSPP_GC:
> + ctx->pending_dspp_flush_mask[dspp - DSPP_0] |= BIT(5);
> + break;
> + default:
> + return;
> + }
> +
> + ctx->pending_flush_mask |= BIT(29);
Can/should we define an _IDX for this, like is done with MERGE_3D_IDX,
DSC_IDX, INTF_IDX and WB_IDX?
> +}
> +
> static u32 dpu_hw_ctl_poll_reset_status(struct dpu_hw_ctl *ctx, u32 timeout_us)
> {
> struct dpu_hw_blk_reg_map *c = &ctx->hw;
> @@ -675,7 +711,11 @@ static void _setup_ctl_ops(struct dpu_hw_ctl_ops *ops,
> ops->setup_blendstage = dpu_hw_ctl_setup_blendstage;
> ops->update_pending_flush_sspp = dpu_hw_ctl_update_pending_flush_sspp;
> ops->update_pending_flush_mixer = dpu_hw_ctl_update_pending_flush_mixer;
> - ops->update_pending_flush_dspp = dpu_hw_ctl_update_pending_flush_dspp;
> + if (cap & BIT(DPU_CTL_DSPP_SUB_BLOCK_FLUSH))
> + ops->update_pending_flush_dspp = dpu_hw_ctl_update_pending_flush_dspp_subblocks;
> + else
> + ops->update_pending_flush_dspp = dpu_hw_ctl_update_pending_flush_dspp;
> +
> if (cap & BIT(DPU_CTL_FETCH_ACTIVE))
> ops->set_active_pipes = dpu_hw_ctl_set_fetch_pipe_active;
> };
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> index 96c012e..78611a8 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> @@ -152,9 +152,11 @@ struct dpu_hw_ctl_ops {
> * No effect on hardware
> * @ctx : ctl path ctx pointer
> * @blk : DSPP block index
> + * @dspp_sub_blk : DSPP sub-block index
> */
> void (*update_pending_flush_dspp)(struct dpu_hw_ctl *ctx,
> - enum dpu_dspp blk);
> + enum dpu_dspp blk, u32 dspp_sub_blk);
> +
> /**
> * Write the value of the pending_flush_mask to hardware
> * @ctx : ctl path ctx pointer
> @@ -242,6 +244,7 @@ struct dpu_hw_ctl {
> u32 pending_intf_flush_mask;
> u32 pending_wb_flush_mask;
> u32 pending_merge_3d_flush_mask;
> + u32 pending_dspp_flush_mask[DSPP_MAX - DSPP_0];
>
> /* ops */
> struct dpu_hw_ctl_ops ops;
> --
> 2.7.4
>
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