linux-kernel - [PATCH v6 04/14] drm/msm/disp/dpu1: Add support for DSC in pingpong block

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Date:   Mon,  4 Apr 2022 22:04:26 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Marek <jonathan@...ek.ca>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org
Subject: [PATCH v6 04/14] drm/msm/disp/dpu1: Add support for DSC in pingpong block

In SDM845, DSC can be enabled by writing to pingpong block registers, so
add support for DSC in hw_pp

Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Vinod Koul <vkoul@...nel.org>
---
 .../gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c   | 32 +++++++++++++++++++
 .../gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.h   | 14 ++++++++
 2 files changed, 46 insertions(+)

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 55766c97c4c8..47c6ab6caf95 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
@@ -28,6 +28,9 @@
 #define PP_FBC_MODE                     0x034
 #define PP_FBC_BUDGET_CTL               0x038
 #define PP_FBC_LOSSY_MODE               0x03C
+#define PP_DSC_MODE                     0x0a0
+#define PP_DCE_DATA_IN_SWAP             0x0ac
+#define PP_DCE_DATA_OUT_SWAP            0x0c8
 
 #define PP_DITHER_EN			0x000
 #define PP_DITHER_BITDEPTH		0x004
@@ -245,6 +248,32 @@ static u32 dpu_hw_pp_get_line_count(struct dpu_hw_pingpong *pp)
 	return line;
 }
 
+static int dpu_hw_pp_dsc_enable(struct dpu_hw_pingpong *pp)
+{
+	struct dpu_hw_blk_reg_map *c = &pp->hw;
+
+	DPU_REG_WRITE(c, PP_DSC_MODE, 1);
+	return 0;
+}
+
+static void dpu_hw_pp_dsc_disable(struct dpu_hw_pingpong *pp)
+{
+	struct dpu_hw_blk_reg_map *c = &pp->hw;
+
+	DPU_REG_WRITE(c, PP_DSC_MODE, 0);
+}
+
+static int dpu_hw_pp_setup_dsc(struct dpu_hw_pingpong *pp)
+{
+	struct dpu_hw_blk_reg_map *pp_c = &pp->hw;
+	int data;
+
+	data = DPU_REG_READ(pp_c, PP_DCE_DATA_OUT_SWAP);
+	data |= BIT(18); /* endian flip */
+	DPU_REG_WRITE(pp_c, PP_DCE_DATA_OUT_SWAP, data);
+	return 0;
+}
+
 static void _setup_pingpong_ops(struct dpu_hw_pingpong *c,
 				unsigned long features)
 {
@@ -256,6 +285,9 @@ static void _setup_pingpong_ops(struct dpu_hw_pingpong *c,
 	c->ops.get_autorefresh = dpu_hw_pp_get_autorefresh_config;
 	c->ops.poll_timeout_wr_ptr = dpu_hw_pp_poll_timeout_wr_ptr;
 	c->ops.get_line_count = dpu_hw_pp_get_line_count;
+	c->ops.setup_dsc = dpu_hw_pp_setup_dsc;
+	c->ops.enable_dsc = dpu_hw_pp_dsc_enable;
+	c->ops.disable_dsc = dpu_hw_pp_dsc_disable;
 
 	if (test_bit(DPU_PINGPONG_DITHER, &features))
 		c->ops.setup_dither = dpu_hw_pp_setup_dither;
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.h
index 89d08a715c16..12758468d9ca 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.h
@@ -124,6 +124,20 @@ struct dpu_hw_pingpong_ops {
 	 */
 	void (*setup_dither)(struct dpu_hw_pingpong *pp,
 			struct dpu_hw_dither_cfg *cfg);
+	/**
+	 * Enable DSC
+	 */
+	int (*enable_dsc)(struct dpu_hw_pingpong *pp);
+
+	/**
+	 * Disable DSC
+	 */
+	void (*disable_dsc)(struct dpu_hw_pingpong *pp);
+
+	/**
+	 * Setup DSC
+	 */
+	int (*setup_dsc)(struct dpu_hw_pingpong *pp);
 };
 
 struct dpu_hw_merge_3d;
-- 
2.34.1