linux-kernel - [PATCH] drm/msm/dpu: fix/enable 6bpc dither with split-lm

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Message-Id: <20200715221955.3209856-1-robdclark@gmail.com>
Date:   Wed, 15 Jul 2020 15:19:51 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Steev Klimaszewski <steev@...too.org>,
        Doug Anderson <dianders@...omium.org>,
        Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Drew Davenport <ddavenport@...omium.org>,
        Kalyan Thota <kalyan_t@...eaurora.org>,
        Zheng Bin <zhengbin13@...wei.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-arm-msm@...r.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU),
        freedreno@...ts.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO
        GPU), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] drm/msm/dpu: fix/enable 6bpc dither with split-lm

From: Rob Clark <robdclark@...omium.org>

If split-lm is used (for ex, on sdm845), we can have multiple ping-
pongs, but only a single phys encoder.  We need to configure dithering
on each of them.

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c   | 22 ++++++++++---------
 .../gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c   |  3 +--
 2 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 46df0ff75b85..9b98b63c77fb 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -212,14 +212,14 @@ static u32 dither_matrix[DITHER_MATRIX_SZ] = {
 	15, 7, 13, 5, 3, 11, 1, 9, 12, 4, 14, 6, 0, 8, 2, 10
 };
 
-static void _dpu_encoder_setup_dither(struct dpu_encoder_phys *phys)
+static void _dpu_encoder_setup_dither(struct dpu_hw_pingpong *hw_pp, unsigned bpc)
 {
 	struct dpu_hw_dither_cfg dither_cfg = { 0 };
 
-	if (!phys->hw_pp || !phys->hw_pp->ops.setup_dither)
+	if (!hw_pp->ops.setup_dither)
 		return;
 
-	switch (phys->connector->display_info.bpc) {
+	switch (bpc) {
 	case 6:
 		dither_cfg.c0_bitdepth = 6;
 		dither_cfg.c1_bitdepth = 6;
@@ -228,14 +228,14 @@ static void _dpu_encoder_setup_dither(struct dpu_encoder_phys *phys)
 		dither_cfg.temporal_en = 0;
 		break;
 	default:
-		phys->hw_pp->ops.setup_dither(phys->hw_pp, NULL);
+		hw_pp->ops.setup_dither(hw_pp, NULL);
 		return;
 	}
 
 	memcpy(&dither_cfg.matrix, dither_matrix,
 			sizeof(u32) * DITHER_MATRIX_SZ);
 
-	phys->hw_pp->ops.setup_dither(phys->hw_pp, &dither_cfg);
+	hw_pp->ops.setup_dither(hw_pp, &dither_cfg);
 }
 
 void dpu_encoder_helper_report_irq_timeout(struct dpu_encoder_phys *phys_enc,
@@ -1132,11 +1132,13 @@ static void _dpu_encoder_virt_enable_helper(struct drm_encoder *drm_enc)
 
 	_dpu_encoder_update_vsync_source(dpu_enc, &dpu_enc->disp_info);
 
-	if (dpu_enc->disp_info.intf_type == DRM_MODE_ENCODER_DSI) {
-		for (i = 0; i < dpu_enc->num_phys_encs; i++) {
-			struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
-
-			_dpu_encoder_setup_dither(phys);
+	if (dpu_enc->disp_info.intf_type == DRM_MODE_ENCODER_DSI &&
+			!WARN_ON(dpu_enc->num_phys_encs == 0)) {
+		unsigned bpc = dpu_enc->phys_encs[0]->connector->display_info.bpc;
+		for (i = 0; i < MAX_CHANNELS_PER_ENC; i++) {
+			if (!dpu_enc->hw_pp[i])
+				continue;
+			_dpu_encoder_setup_dither(dpu_enc->hw_pp[i], bpc);
 		}
 	}
 }
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
index 7411ab6bf6af..bea4ab5c58c5 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
@@ -231,8 +231,7 @@ static void _setup_pingpong_ops(struct dpu_hw_pingpong *c,
 	c->ops.poll_timeout_wr_ptr = dpu_hw_pp_poll_timeout_wr_ptr;
 	c->ops.get_line_count = dpu_hw_pp_get_line_count;
 
-	if (test_bit(DPU_PINGPONG_DITHER, &features) &&
-		IS_SC7180_TARGET(c->hw.hwversion))
+	if (test_bit(DPU_PINGPONG_DITHER, &features))
 		c->ops.setup_dither = dpu_hw_pp_setup_dither;
 };
 
-- 
2.26.2