qualcomm/sc7180: Switch to common MIPI panel library

This patch changes the sc7180 boards to use the new common MIPI panel
framework, which allows more flexible initialization command packing and
sharing panel definitions between boards. (I'm taking the lane count
control back out again for now, since it seems we only ever want 4 for
now anyway, and if we ever have a need for a different lane count it's
not clear whether that should be a property of the board or the panel or
both. Better to leave that decision until we have a real use case.)

Also, the code was not written to deal with DCS commands that were not a
length divisible by 4 (it would read over the end of the command
buffer). The corresponding kernel driver seems to pad the command with
0xff instead, let's do the same here. (Also increase the maximum allowed
command length to 256 bytes, as per Qualcomm's recommendation.)

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I78f6efbaa9da88a3574d5c6a51061e308412340e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56966
Reviewed-by: Shelley Chen <shchen@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

3 files changed, 40 insertions, 69 deletions

diff --git a/src/soc/qualcomm/sc7180/display/dsi.c b/src/soc/qualcomm/sc7180/display/dsi.c
index 268200809a..e0aa0efd4d 100644
--- a/src/soc/qualcomm/sc7180/display/dsi.c
+++ b/src/soc/qualcomm/sc7180/display/dsi.c
@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <device/mipi_panel.h>
 #include <device/mmio.h>
 #include <console/console.h>
 #include <assert.h>
@@ -9,7 +10,6 @@
 #include <types.h>
 #include <string.h>
 #include <soc/display/mipi_dsi.h>
-#include <soc/display/panel.h>
 #include <soc/display/mdssreg.h>
 #include <soc/display/dsi_phy.h>
 
@@ -30,7 +30,7 @@
 
 #define HS_TX_TO 0xEA60
 #define TIMER_RESOLUTION 0x4
-#define DSI_PAYLOAD_BYTE_BOUND 8
+#define DSI_PAYLOAD_BYTE_BOUND 256
 #define DSI_PAYLOAD_SIZE_ALIGN 4
 #define DSI_CMD_DMA_TPG_EN  BIT(1)
 #define DSI_TPG_DMA_FIFO_MODE BIT(2)
@@ -210,56 +210,54 @@ static int mdss_dsi_cmd_dma_trigger_for_panel(void)
 	return status;
 }
 
-static int mdss_dsi_cmds_tx(struct mipi_dsi_cmd *cmds, int count)
+static cb_err_t mdss_dsi_send_init_cmd(enum panel_init_cmd cmd, const u8 *body, u8 len)
 {
-	struct mipi_dsi_cmd *cm;
 	uint8_t *pload = _dma_coherent;
 	uint32_t size;
+	cb_err_t ret = CB_SUCCESS;
 	int data = 0;
-	int ret = 0;
 	uint32_t *bp = NULL;
 
-	cm = cmds;
+	/* This implementation only supports DCS commands (I think?). */
+	assert(cmd == PANEL_CMD_DCS);
 
-	for (int i = 0; i < count; i++) {
-		/* The payload size has to be a multiple of 4 */
-		size = ALIGN_UP(cm->size, DSI_PAYLOAD_SIZE_ALIGN);
-		assert(size < DSI_PAYLOAD_BYTE_BOUND);
-		memcpy(pload, (cm[i].payload), size);
+	/* The payload size has to be a multiple of 4 */
+	memcpy(pload, body, len);
+	size = ALIGN_UP(len, DSI_PAYLOAD_SIZE_ALIGN);
+	memset(pload + len, 0xff, size - len);
+	assert(size < DSI_PAYLOAD_BYTE_BOUND);
 
-		bp = (uint32_t *)pload;
+	bp = (uint32_t *)pload;
 
-		/* Enable custom pattern stored in TPG DMA FIFO */
-		data = DSI_CMD_DMA_PATTERN_SEL;
+	/* Enable custom pattern stored in TPG DMA FIFO */
+	data = DSI_CMD_DMA_PATTERN_SEL;
 
-		/* select CMD_DMA_FIFO_MODE to 1 */
-		data |= DSI_TPG_DMA_FIFO_MODE;
-		data |= DSI_CMD_DMA_TPG_EN;
+	/* select CMD_DMA_FIFO_MODE to 1 */
+	data |= DSI_TPG_DMA_FIFO_MODE;
+	data |= DSI_CMD_DMA_TPG_EN;
 
-		write32(&dsi0->test_pattern_gen_ctrl, data);
-		for (int j = 0; j < size; j += 4) {
-			write32(&dsi0->test_pattern_gen_cmd_dma_init_val, *bp);
-			bp++;
-		}
+	write32(&dsi0->test_pattern_gen_ctrl, data);
+	for (int j = 0; j < size; j += 4) {
+		write32(&dsi0->test_pattern_gen_cmd_dma_init_val, *bp);
+		bp++;
+	}
 
-		if ((size % 8) != 0)
-			write32(&dsi0->test_pattern_gen_cmd_dma_init_val, 0x0);
+	if ((size % 8) != 0)
+		write32(&dsi0->test_pattern_gen_cmd_dma_init_val, 0x0);
 
-		write32(&dsi0->dma_cmd_length, size);
-		write32(&dsi0->cmd_mode_dma_sw_trigger, 0x1);
-		ret += mdss_dsi_cmd_dma_trigger_for_panel();
+	write32(&dsi0->dma_cmd_length, size);
+	write32(&dsi0->cmd_mode_dma_sw_trigger, 0x1);
+	if (mdss_dsi_cmd_dma_trigger_for_panel())
+		ret = CB_ERR;
+
+	/* Reset the DMA TPG FIFO */
+	write32(&dsi0->tpg_dma_fifo_reset, 0x1);
+	write32(&dsi0->tpg_dma_fifo_reset, 0x0);
 
-		/* Reset the DMA TPG FIFO */
-		write32(&dsi0->tpg_dma_fifo_reset, 0x1);
-		write32(&dsi0->tpg_dma_fifo_reset, 0x0);
+	/* Disable CMD_DMA_TPG */
+	write32(&dsi0->test_pattern_gen_ctrl, 0x0);
 
-		/* Disable CMD_DMA_TPG */
-		write32(&dsi0->test_pattern_gen_ctrl, 0x0);
-		if (cm[i].delay_us)
-			udelay(cm[i].delay_us);
-		else
-			udelay(80);
-	}
+	udelay(80);
 
 	return ret;
 }
@@ -274,22 +272,19 @@ static void mdss_dsi_clear_intr(void)
 	write32(&dsi0->err_int_mask0, 0x13FF3BFF);
 }
 
-int mdss_dsi_panel_initialize(const struct panel_data *pinfo)
+cb_err_t mdss_dsi_panel_initialize(const u8 *init_cmds)
 {
-	int status = 0;
 	uint32_t ctrl_mode = 0;
-	struct mipi_dsi_cmd *cmds;
 
-	assert((pinfo != NULL) && (pinfo->init_cmd != NULL));
-	cmds = pinfo->init_cmd;
+	assert(init_cmds != NULL);
 	ctrl_mode = read32(&dsi0->ctrl);
 
 	/* Enable command mode before sending the commands */
 	write32(&dsi0->ctrl, ctrl_mode | 0x04);
 
-	status = mdss_dsi_cmds_tx(cmds, pinfo->init_cmd_count);
+	cb_err_t ret = mipi_panel_parse_init_commands(init_cmds, mdss_dsi_send_init_cmd);
 	write32(&dsi0->ctrl, ctrl_mode);
 	mdss_dsi_clear_intr();
 
-	return status;
+	return ret;
 }
diff --git a/src/soc/qualcomm/sc7180/include/soc/display/mipi_dsi.h b/src/soc/qualcomm/sc7180/include/soc/display/mipi_dsi.h
index 3b3dc513ab..a7c9b6e4af 100644
--- a/src/soc/qualcomm/sc7180/include/soc/display/mipi_dsi.h
+++ b/src/soc/qualcomm/sc7180/include/soc/display/mipi_dsi.h
@@ -3,7 +3,6 @@
 #ifndef _SOC_DISPLAY_MIPI_DSI_H_
 #define _SOC_DISPLAY_MIPI_DSI_H_
 
-#include <soc/display/panel.h>
 /**********************************************************
   DSI register configuration options
  **********************************************************/
@@ -15,12 +14,6 @@
 #define DSI_VIDEO_DST_FORMAT_RGB666_LOOSE	2
 #define DSI_VIDEO_DST_FORMAT_RGB888		3
 
-struct mipi_dsi_cmd {
-	char payload[4];
-	uint32_t size;
-	int delay_us;
-};
-
 enum {
 	DSI_VIDEO_MODE,
 	DSI_CMD_MODE,
@@ -29,6 +22,6 @@ enum {
 enum cb_err mdss_dsi_config(struct edid *edid, uint32_t num_of_lanes, uint32_t bpp);
 void mdss_dsi_clock_config(void);
 void mdss_dsi_video_mode_config(struct edid *edid, uint32_t bpp);
-int mdss_dsi_panel_initialize(const struct panel_data *pinfo);
+cb_err_t mdss_dsi_panel_initialize(const u8 *init_cmds);
 
 #endif
diff --git a/src/soc/qualcomm/sc7180/include/soc/display/panel.h b/src/soc/qualcomm/sc7180/include/soc/display/panel.h
deleted file mode 100644
index 04a7a6ab06..0000000000
--- a/src/soc/qualcomm/sc7180/include/soc/display/panel.h
+++ /dev/null
@@ -1,17 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-
-#ifndef _PANEL_H_
-#define _PANEL_H_
-
-#include <types.h>
-
-struct panel_data {
-	uint8_t lanes;
-	struct mipi_dsi_cmd *init_cmd;
-	uint32_t init_cmd_count;
-};
-
-void panel_power_on(void);
-const struct panel_data *get_panel_config(struct edid *edid);
-
-#endif /*_PANEL_H_ */