drm/msm/dsi: Add support for DSC configuration

When DSC is enabled, we need to configure DSI registers accordingly and
configure the respective stream compression registers.

Add support to calculate the register setting based on DSC params and
timing information and configure these registers.

Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/gpu/drm/msm/dsi/dsi.xml.h

@@ -2310,4 +2310,14 @@ static inline uint32_t REG_DSI_7nm_PHY_LN_TX_DCTRL(uint32_t i0) { return 0x00000
 
 #define REG_DSI_7nm_PHY_PLL_PERF_OPTIMIZE			0x00000260
 
+#define REG_DSI_VIDEO_COMPRESSION_MODE_CTRL			0x0000029c
+
+#define REG_DSI_VIDEO_COMPRESSION_MODE_CTRL2			0x000002a0
+
+#define REG_DSI_COMMAND_COMPRESSION_MODE_CTRL			0x000002a4
+
+#define REG_DSI_COMMAND_COMPRESSION_MODE_CTRL2			0x000002a8
+
+#define REG_DSI_COMMAND_COMPRESSION_MODE_CTRL3			0x000002ac
+
 #endif /* DSI_XML */

drivers/gpu/drm/msm/dsi/dsi_host.c

@@ -942,6 +942,26 @@ static void dsi_ctrl_config(struct msm_dsi_host *msm_host, bool enable,
 	dsi_write(msm_host, REG_DSI_CTRL, data);
 }
 
+static int dsi_dsc_update_pic_dim(struct msm_display_dsc_config *dsc,
+				  int pic_width, int pic_height)
+{
+	if (!dsc || !pic_width || !pic_height) {
+		pr_err("DSI: invalid input: pic_width: %d pic_height: %d\n", pic_width, pic_height);
+		return -EINVAL;
+	}
+
+	if ((pic_width % dsc->drm->slice_width) || (pic_height % dsc->drm->slice_height)) {
+		pr_err("DSI: pic_dim %dx%d has to be multiple of slice %dx%d\n",
+		       pic_width, pic_height, dsc->drm->slice_width, dsc->drm->slice_height);
+		return -EINVAL;
+	}
+
+	dsc->drm->pic_width = pic_width;
+	dsc->drm->pic_height = pic_height;
+
+	return 0;
+}
+
 static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_dual_dsi)
 {
 	struct drm_display_mode *mode = msm_host->mode;
@@ -956,6 +976,7 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_dual_dsi)
 	u32 va_end = va_start + mode->vdisplay;
 	u32 hdisplay = mode->hdisplay;
 	u32 wc;
+	u32 data;
 
 	DBG("");
 
@@ -974,7 +995,73 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_dual_dsi)
 		hdisplay /= 2;
 	}
 
+	if (msm_host->dsc) {
+		struct msm_display_dsc_config *dsc = msm_host->dsc;
+
+		/* update dsc params with timing params */
+		dsi_dsc_update_pic_dim(dsc, mode->hdisplay, mode->vdisplay);
+		DBG("Mode Width- %d x Height %d\n", dsc->drm->pic_width, dsc->drm->pic_height);
+
+		/* we do the calculations for dsc parameters here so that
+		 * panel can use these parameters
+		 */
+		dsi_populate_dsc_params(dsc);
+
+		/* Divide the display by 3 but keep back/font porch and
+		 * pulse width same
+		 */
+		h_total -= hdisplay;
+		hdisplay /= 3;
+		h_total += hdisplay;
+		ha_end = ha_start + hdisplay;
+	}
+
 	if (msm_host->mode_flags & MIPI_DSI_MODE_VIDEO) {
+		if (msm_host->dsc) {
+			struct msm_display_dsc_config *dsc = msm_host->dsc;
+			u32 reg, intf_width, slice_per_intf, width;
+			u32 total_bytes_per_intf;
+
+			/* first calculate dsc parameters and then program
+			 * compress mode registers
+			 */
+			intf_width = hdisplay;
+			slice_per_intf = DIV_ROUND_UP(intf_width, dsc->drm->slice_width);
+
+			/* If slice_count > slice_per_intf, then use 1
+			 * This can happen during partial update
+			 */
+				dsc->drm->slice_count = 1;
+
+			dsc->bytes_in_slice = DIV_ROUND_UP(dsc->drm->slice_width * 8, 8);
+			total_bytes_per_intf = dsc->bytes_in_slice * slice_per_intf;
+
+			dsc->eol_byte_num = total_bytes_per_intf % 3;
+			dsc->pclk_per_line =  DIV_ROUND_UP(total_bytes_per_intf, 3);
+			dsc->bytes_per_pkt = dsc->bytes_in_slice * dsc->drm->slice_count;
+			dsc->pkt_per_line = slice_per_intf / dsc->drm->slice_count;
+
+			width = dsc->pclk_per_line;
+			reg = dsc->bytes_per_pkt << 16;
+			reg |= (0x0b << 8);    /* dtype of compressed image */
+
+			/* pkt_per_line:
+			 * 0 == 1 pkt
+			 * 1 == 2 pkt
+			 * 2 == 4 pkt
+			 * 3 pkt is not supported
+			 * above translates to ffs() - 1
+			 */
+			reg |= (ffs(dsc->pkt_per_line) - 1) << 6;
+
+			dsc->eol_byte_num = total_bytes_per_intf % 3;
+			reg |= dsc->eol_byte_num << 4;
+			reg |= 1;
+
+			dsi_write(msm_host,
+				  REG_DSI_VIDEO_COMPRESSION_MODE_CTRL, reg);
+		}
+
 		dsi_write(msm_host, REG_DSI_ACTIVE_H,
 			DSI_ACTIVE_H_START(ha_start) |
 			DSI_ACTIVE_H_END(ha_end));
@@ -993,19 +1080,50 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_dual_dsi)
 			DSI_ACTIVE_VSYNC_VPOS_START(vs_start) |
 			DSI_ACTIVE_VSYNC_VPOS_END(vs_end));
 	} else {		/* command mode */
+		if (msm_host->dsc) {
+			struct msm_display_dsc_config *dsc = msm_host->dsc;
+			u32 reg, reg_ctrl, reg_ctrl2;
+			u32 slice_per_intf, bytes_in_slice, total_bytes_per_intf;
+
+			reg_ctrl = dsi_read(msm_host, REG_DSI_COMMAND_COMPRESSION_MODE_CTRL);
+			reg_ctrl2 = dsi_read(msm_host, REG_DSI_COMMAND_COMPRESSION_MODE_CTRL2);
+
+			slice_per_intf = DIV_ROUND_UP(hdisplay, dsc->drm->slice_width);
+			bytes_in_slice = DIV_ROUND_UP(dsc->drm->slice_width *
+						      dsc->drm->bits_per_pixel, 8);
+			dsc->drm->slice_chunk_size = bytes_in_slice;
+			total_bytes_per_intf = dsc->bytes_in_slice * slice_per_intf;
+			dsc->pkt_per_line = slice_per_intf / dsc->drm->slice_count;
+
+			reg = 0x39 << 8;
+			reg |= ffs(dsc->pkt_per_line) << 6;
+
+			dsc->eol_byte_num = total_bytes_per_intf % 3;
+			reg |= dsc->eol_byte_num << 4;
+			reg |= 1;
+
+			reg_ctrl |= reg;
+			reg_ctrl2 |= bytes_in_slice;
+
+			dsi_write(msm_host, REG_DSI_COMMAND_COMPRESSION_MODE_CTRL, reg);
+			dsi_write(msm_host, REG_DSI_COMMAND_COMPRESSION_MODE_CTRL2, reg_ctrl2);
+		}
+
 		/* image data and 1 byte write_memory_start cmd */
-		wc = hdisplay * dsi_get_bpp(msm_host->format) / 8 + 1;
+		if (!msm_host->dsc)
+			wc = hdisplay * dsi_get_bpp(msm_host->format) / 8 + 1;
+		else
+			wc = mode->hdisplay / 2 + 1;
 
-		dsi_write(msm_host, REG_DSI_CMD_MDP_STREAM0_CTRL,
-			DSI_CMD_MDP_STREAM0_CTRL_WORD_COUNT(wc) |
-			DSI_CMD_MDP_STREAM0_CTRL_VIRTUAL_CHANNEL(
-					msm_host->channel) |
-			DSI_CMD_MDP_STREAM0_CTRL_DATA_TYPE(
-					MIPI_DSI_DCS_LONG_WRITE));
+		data = DSI_CMD_MDP_STREAM0_CTRL_WORD_COUNT(wc) |
+		       DSI_CMD_MDP_STREAM0_CTRL_VIRTUAL_CHANNEL(msm_host->channel) |
+			DSI_CMD_MDP_STREAM0_CTRL_DATA_TYPE(MIPI_DSI_DCS_LONG_WRITE);
 
-		dsi_write(msm_host, REG_DSI_CMD_MDP_STREAM0_TOTAL,
-			DSI_CMD_MDP_STREAM0_TOTAL_H_TOTAL(hdisplay) |
-			DSI_CMD_MDP_STREAM0_TOTAL_V_TOTAL(mode->vdisplay));
+		dsi_write(msm_host, REG_DSI_CMD_MDP_STREAM0_CTRL, data);
+
+		data = DSI_CMD_MDP_STREAM0_TOTAL_H_TOTAL(hdisplay) |
+			DSI_CMD_MDP_STREAM0_TOTAL_V_TOTAL(mode->vdisplay);
+		dsi_write(msm_host, REG_DSI_CMD_MDP_STREAM0_TOTAL, data);
 	}
 }
 
@@ -2074,6 +2192,7 @@ int msm_dsi_host_modeset_init(struct mipi_dsi_host *host,
 	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
 	const struct msm_dsi_cfg_handler *cfg_hnd = msm_host->cfg_hnd;
 	struct platform_device *pdev = msm_host->pdev;
+	struct msm_drm_private *priv;
 	int ret;
 
 	msm_host->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
@@ -2093,6 +2212,9 @@ int msm_dsi_host_modeset_init(struct mipi_dsi_host *host,
 	}
 
 	msm_host->dev = dev;
+	priv = dev->dev_private;
+	priv->dsc = msm_host->dsc;
+
 	ret = cfg_hnd->ops->tx_buf_alloc(msm_host, SZ_4K);
 	if (ret) {
 		pr_err("%s: alloc tx gem obj failed, %d\n", __func__, ret);