linux-kernel - [PATCH v3 6/6] drm/msm/dsi: support DSC configurations with slice_per

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Message-Id: <20240403-msm-drm-dsc-dsi-video-upstream-v1-6-db5036443545@linaro.org>
Date: Wed, 03 Apr 2024 17:11:02 +0800
From: Jun Nie <jun.nie@...aro.org>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, Vinod Koul <vkoul@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Jun Nie <jun.nie@...aro.org>, Jonathan Marek <jonathan@...ek.ca>
Subject: [PATCH v3 6/6] drm/msm/dsi: support DSC configurations with
 slice_per_pkt > 1

From: Jonathan Marek <jonathan@...ek.ca>

Support slice_per_pkt in msm driver.

Note that the removed "pkt_per_line = slice_per_intf * slice_per_pkt"
comment is incorrect.

Also trim the code to simplify the dsc reference.

Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
Signed-off-by: Jun Nie <jun.nie@...aro.org>
---
 drivers/gpu/drm/msm/dsi/dsi_host.c | 35 ++++++++++++++---------------------
 1 file changed, 14 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index b0507a42ee6a..0c6f40dbd25c 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -866,17 +866,10 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
 	slice_per_intf = msm_dsc_get_slices_per_intf(dsc, hdisplay);
 
 	total_bytes_per_intf = dsc->slice_chunk_size * slice_per_intf;
-	bytes_per_pkt = dsc->slice_chunk_size; /* * slice_per_pkt; */
-
+	bytes_per_pkt = dsc->slice_chunk_size * dsc->slice_per_pkt;
 	eol_byte_num = total_bytes_per_intf % 3;
 
-	/*
-	 * Typically, pkt_per_line = slice_per_intf * slice_per_pkt.
-	 *
-	 * Since the current driver only supports slice_per_pkt = 1,
-	 * pkt_per_line will be equal to slice per intf for now.
-	 */
-	pkt_per_line = slice_per_intf;
+	pkt_per_line = slice_per_intf / dsc->slice_per_pkt;
 
 	if (is_cmd_mode) /* packet data type */
 		reg = DSI_COMMAND_COMPRESSION_MODE_CTRL_STREAM0_DATATYPE(MIPI_DSI_DCS_LONG_WRITE);
@@ -916,6 +909,7 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
 static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
 {
 	struct drm_display_mode *mode = msm_host->mode;
+	struct drm_dsc_config *dsc = msm_host->dsc;
 	u32 hs_start = 0, vs_start = 0; /* take sync start as 0 */
 	u32 h_total = mode->htotal;
 	u32 v_total = mode->vtotal;
@@ -947,8 +941,7 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
 		hdisplay /= 2;
 	}
 
-	if (msm_host->dsc) {
-		struct drm_dsc_config *dsc = msm_host->dsc;
+	if (dsc) {
 		u32 bytes_per_pclk;
 
 		/* update dsc params with timing params */
@@ -988,14 +981,14 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
 		else
 			bytes_per_pclk = 3;
 
-		hdisplay = DIV_ROUND_UP(msm_dsc_get_bytes_per_line(msm_host->dsc), bytes_per_pclk);
+		hdisplay = DIV_ROUND_UP(msm_dsc_get_bytes_per_line(dsc), bytes_per_pclk);
 
 		h_total += hdisplay;
 		ha_end = ha_start + hdisplay;
 	}
 
 	if (msm_host->mode_flags & MIPI_DSI_MODE_VIDEO) {
-		if (msm_host->dsc)
+		if (dsc)
 			dsi_update_dsc_timing(msm_host, false, mode->hdisplay);
 
 		dsi_write(msm_host, REG_DSI_ACTIVE_H,
@@ -1016,21 +1009,17 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
 			DSI_ACTIVE_VSYNC_VPOS_START(vs_start) |
 			DSI_ACTIVE_VSYNC_VPOS_END(vs_end));
 	} else {		/* command mode */
-		if (msm_host->dsc)
+		if (dsc)
 			dsi_update_dsc_timing(msm_host, true, mode->hdisplay);
 
 		/* image data and 1 byte write_memory_start cmd */
-		if (!msm_host->dsc)
+		if (!dsc)
 			wc = hdisplay * mipi_dsi_pixel_format_to_bpp(msm_host->format) / 8 + 1;
 		else
 			/*
 			 * When DSC is enabled, WC = slice_chunk_size * slice_per_pkt + 1.
-			 * Currently, the driver only supports default value of slice_per_pkt = 1
-			 *
-			 * TODO: Expand mipi_dsi_device struct to hold slice_per_pkt info
-			 *       and adjust DSC math to account for slice_per_pkt.
 			 */
-			wc = msm_host->dsc->slice_chunk_size + 1;
+			wc = dsc->slice_chunk_size * dsc->slice_per_pkt + 1;
 
 		dsi_write(msm_host, REG_DSI_CMD_MDP_STREAM0_CTRL,
 			DSI_CMD_MDP_STREAM0_CTRL_WORD_COUNT(wc) |
@@ -1657,8 +1646,12 @@ static int dsi_host_attach(struct mipi_dsi_host *host,
 	msm_host->lanes = dsi->lanes;
 	msm_host->format = dsi->format;
 	msm_host->mode_flags = dsi->mode_flags;
-	if (dsi->dsc)
+	if (dsi->dsc) {
 		msm_host->dsc = dsi->dsc;
+		/* for backwards compatibility, assume 1 if not set */
+		if (!dsi->dsc->slice_per_pkt)
+			dsi->dsc->slice_per_pkt = 1;
+	}
 
 	/* Some gpios defined in panel DT need to be controlled by host */
 	ret = dsi_host_init_panel_gpios(msm_host, &dsi->dev);

-- 
2.34.1