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Message-ID: <CAA8EJpqwB9Skq_DVwHERn0Soz=4hHLDiyzyeEteWfb6QbePU4g@mail.gmail.com>
Date: Fri, 2 Sep 2022 14:09:32 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.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@...il.com,
dianders@...omium.org, swboyd@...omium.org,
quic_vpolimer@...cinc.com, quic_abhinavk@...cinc.com
Subject: Re: [v2] drm/msm/disp/dpu1: add support for dspp sub block flush in sc7280
On Fri, 2 Sept 2022 at 12:38, Kalyan Thota <quic_kalyant@...cinc.com> 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)
> ---
> 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 | 2 ++
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c | 35 +++++++++++++++++++++++++-
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h | 10 ++++++--
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h | 7 ++++++
> 6 files changed, 56 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..ab38a52 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_SUB_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..6a0b784 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> @@ -191,6 +191,7 @@ 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
> * @DPU_CTL_MAX
> */
> enum {
> @@ -198,6 +199,7 @@ 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..3b14c30 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 0x13C
CTL_DSPP_n_FLUSH(n)
>
> #define CTL_MIXER_BORDER_OUT BIT(24)
> #define CTL_FLUSH_MASK_CTL BIT(17)
> @@ -82,6 +83,31 @@ static int _mixer_stages(const struct dpu_lm_cfg *mixer, int count,
> return stages;
> }
>
> +static u32 _set_dspp_sub_block_flush(struct dpu_hw_ctl *ctx,
> + enum dpu_dspp dspp, enum dpu_dspp_sub_blk dspp_sub_blk)
> +{
> + uint32_t flushbits = 0, active;
> +
> + switch (dspp_sub_blk) {
> + case DPU_DSPP_SUB_IGC:
> + flushbits = BIT(2);
> + break;
> + case DPU_DSPP_SUB_PCC:
> + flushbits = BIT(4);
> + break;
> + case DPU_DSPP_SUB_GC:
> + flushbits = BIT(5);
> + break;
> + default:
> + return 0;
> + }
> +
> + active = DPU_REG_READ(&ctx->hw, CTL_DSPP_n_FLUSH + ((dspp - 1) * 4));
> + DPU_REG_WRITE(&ctx->hw, CTL_DSPP_n_FLUSH + ((dspp - 1) * 4), active | flushbits);
> +
> + return BIT(29);
> +}
> +
> static inline u32 dpu_hw_ctl_get_flush_register(struct dpu_hw_ctl *ctx)
> {
> struct dpu_hw_blk_reg_map *c = &ctx->hw;
> @@ -287,8 +313,15 @@ 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, enum dpu_dspp_sub_blk dspp_sub_blk)
> {
> +
> + if ((test_bit(DPU_CTL_DSPP_SUB_BLOCK_FLUSH, &ctx->caps->features))) {
> + ctx->pending_flush_mask |=
> + _set_dspp_sub_block_flush(ctx, dspp, dspp_sub_blk);
> + return;
> + }
Please inline _set_dspp_sub_block_flush(), split this if to a
separate function (e.g.
dpu_hw_ctl_update_pending_flush_dspp_subblocks()), and use it instead
of dpu_hw_ctl_update_pending_flush_dspp like it was done before.
> +
> switch (dspp) {
> case DSPP_0:
> ctx->pending_flush_mask |= BIT(13);
> 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..227f1bd 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> @@ -149,12 +149,18 @@ struct dpu_hw_ctl_ops {
>
> /**
> * OR in the given flushbits to the cached pending_flush_mask
> - * No effect on hardware
> + *
> + * If the hardware supports dspp sub block flush, then sub-block
> + * flushes are written to the hardware and main dspp flush will
> + * be cached in the pending_flush_mask.
> + *
> * @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, enum dpu_dspp_sub_blk dspp_sub_blk);
> +
> /**
> * Write the value of the pending_flush_mask to hardware
> * @ctx : ctl path ctx pointer
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> index d3b0ed0..c113d52 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> @@ -167,6 +167,13 @@ enum dpu_dspp {
> DSPP_MAX
> };
>
> +enum dpu_dspp_sub_blk{
> + DPU_DSPP_SUB_PCC = 1,
> + DPU_DSPP_SUB_IGC,
> + DPU_DSPP_SUB_GC,
> + DPU_DSPP_SUB_MAX
> +};
Can we please use the existing enum DPU_DSPP_foo instead of adding a
new enum for no particular reason?
> +
> enum dpu_ctl {
> CTL_0 = 1,
> CTL_1,
> --
> 2.7.4
>
--
With best wishes
Dmitry
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