soc/mediatek: dsi: Support sending MIPI init commands

For systems with real MIPI panels (8173/oak was using PS8640 eDP
bridge), we have to send DCS commands to initialize panel.

BUG=b:80501386,b:117254947
TEST=make -j # board = oak and boots

Change-Id: Ie7c824873465ac82a95bcb0ed67b8b9866987008
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34773
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/oak/mainboard.c

@@ -234,7 +234,7 @@ static void display_startup(void)
 	edid_set_framebuffer_bits_per_pixel(&edid, 32, 0);
 
 	mtk_ddp_init();
-	ret = mtk_dsi_init(mipi_dsi_flags, MIPI_DSI_FMT_RGB888, 4, &edid);
+	ret = mtk_dsi_init(mipi_dsi_flags, MIPI_DSI_FMT_RGB888, 4, &edid, NULL);
 	if (ret < 0) {
 		printk(BIOS_ERR, "dsi init fail\n");
 		return;

src/soc/mediatek/common/dsi.c

@@ -13,6 +13,7 @@
  * GNU General Public License for more details.
  */
 
+#include <assert.h>
 #include <device/mmio.h>
 #include <console/console.h>
 #include <device/mmio.h>
@@ -256,7 +257,124 @@ static void mtk_dsi_start(void)
 	write32(&dsi0->dsi_start, 1);
 }
 
-int mtk_dsi_init(u32 mode_flags, u32 format, u32 lanes, const struct edid *edid)
+static bool mtk_dsi_is_read_command(u32 type)
+{
+	switch (type) {
+	case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
+	case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
+	case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
+	case MIPI_DSI_DCS_READ:
+		return true;
+	}
+	return false;
+}
+
+static void mtk_dsi_cmdq(const u8 *data, u8 len, u32 type)
+{
+	const u8 *tx_buf = data;
+	u32 config;
+	int i, j;
+
+	if (!wait_ms(20, !(read32(&dsi0->dsi_intsta) & DSI_BUSY))) {
+		printk(BIOS_ERR, "%s: cannot get DSI ready for sending commands"
+		       " after 20ms and the panel may not work properly.\n",
+		       __func__);
+		return;
+	}
+	write32(&dsi0->dsi_intsta, 0);
+
+	if (mtk_dsi_is_read_command(type))
+		config = BTA;
+	else
+		config = (len > 2) ? LONG_PACKET : SHORT_PACKET;
+
+	if (len <= 2) {
+		uint32_t val = (type << 8) | config;
+		for (i = 0; i < len; i++)
+			val |= tx_buf[i] << (i + 2) * 8;
+		write32(&dsi0->dsi_cmdq[0], val);
+		write32(&dsi0->dsi_cmdq_size, 1);
+	} else {
+		/* TODO(hungte) Replace by buffer_to_fifo32_prefix */
+		write32(&dsi0->dsi_cmdq[0], (len << 16) | (type << 8) | config);
+		for (i = 0; i < len; i += 4) {
+			uint32_t val = 0;
+			for (j = 0; j < MIN(len - i, 4); j++)
+				val |= tx_buf[i + j] << j * 8;
+			write32(&dsi0->dsi_cmdq[i / 4 + 1], val);
+		}
+		write32(&dsi0->dsi_cmdq_size, 1 + DIV_ROUND_UP(len, 4));
+	}
+
+	mtk_dsi_start();
+
+	if (!wait_us(400, read32(&dsi0->dsi_intsta) & CMD_DONE_INT_FLAG)) {
+		printk(BIOS_ERR, "%s: failed sending DSI command, "
+		       "panel may not work.\n", __func__);
+		return;
+	}
+}
+
+static void mtk_dsi_send_init_commands(const struct lcm_init_command *init)
+{
+	if (!init)
+		return;
+
+	for (; init->cmd != LCM_END_CMD; init++) {
+		u32 cmd = init->cmd, len = init->len;
+		u32 type;
+
+		switch (cmd) {
+		case LCM_DELAY_CMD:
+			mdelay(len);
+			continue;
+
+		case LCM_DCS_CMD:
+			switch (len) {
+			case 0:
+				return;
+			case 1:
+				type = MIPI_DSI_DCS_SHORT_WRITE;
+				break;
+			case 2:
+				type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
+				break;
+			default:
+				type = MIPI_DSI_DCS_LONG_WRITE;
+				break;
+			}
+			break;
+
+		case LCM_GENERIC_CMD:
+			switch (len) {
+			case 0:
+				type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM;
+				break;
+			case 1:
+				type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM;
+				break;
+			case 2:
+				type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM;
+				break;
+			default:
+				type = MIPI_DSI_GENERIC_LONG_WRITE;
+				break;
+			}
+			break;
+
+		default:
+			printk(BIOS_ERR, "%s: Unknown cmd: %d, "
+			       "abort panel initialization.\n", __func__, cmd);
+			return;
+
+		}
+		assert(len <= sizeof(init->data));
+		mtk_dsi_cmdq(init->data, len, type);
+	}
+}
+
+int mtk_dsi_init(u32 mode_flags, u32 format, u32 lanes, const struct edid *edid,
+		 const struct lcm_init_command *init_commands)
 {
 	int data_rate;
 	u32 bits_per_pixel = mtk_dsi_get_bits_per_pixel(format);
@@ -272,9 +390,9 @@ int mtk_dsi_init(u32 mode_flags, u32 format, u32 lanes, const struct edid *edid)
 	mtk_dsi_rxtx_control(mode_flags, lanes);
 	mtk_dsi_clk_hs_mode_disable();
 	mtk_dsi_config_vdo_timing(mode_flags, format, lanes, edid, &phy_timing);
-	mtk_dsi_set_mode(mode_flags);
 	mtk_dsi_clk_hs_mode_enable();
-
+	mtk_dsi_send_init_commands(init_commands);
+	mtk_dsi_set_mode(mode_flags);
 	mtk_dsi_start();
 
 	return 0;

src/soc/mediatek/common/include/soc/dsi_common.h

@@ -85,14 +85,14 @@ struct dsi_regs {
 	u8 reserved4[16];
 	u32 dsi_vm_cmd_con;
 	u8 reserved5[204];
-	u32 dsi_cmdq0;
+	u32 dsi_cmdq[128];
 };
 static struct dsi_regs *const dsi0 = (void *)DSI0_BASE;
 
 check_member(dsi_regs, dsi_phy_lccon, 0x104);
 check_member(dsi_regs, dsi_phy_timecon3, 0x11c);
 check_member(dsi_regs, dsi_vm_cmd_con, 0x130);
-check_member(dsi_regs, dsi_cmdq0, 0x200);
+check_member(dsi_regs, dsi_cmdq, 0x200);
 
 /* DSI_INTSTA */
 enum {
@@ -324,6 +324,18 @@ struct mtk_phy_timing {
 	u32 d_phy;
 };
 
+/* Definitions for cmd in lcm_init_command */
+#define LCM_END_CMD 0
+#define LCM_DELAY_CMD 1
+#define LCM_GENERIC_CMD 2
+#define LCM_DCS_CMD 3
+
+struct lcm_init_command {
+	u16 cmd;
+	u16 len;
+	u8 data[8];
+};
+
 /* Functions that each SOC should provide. */
 void mtk_dsi_reset(void);
 void mtk_dsi_configure_mipi_tx(int data_rate, u32 lanes);
@@ -332,7 +344,8 @@ void mtk_dsi_configure_mipi_tx(int data_rate, u32 lanes);
 void mtk_dsi_override_phy_timing(struct mtk_phy_timing *timing);
 
 /* Public API provided in common/dsi.c */
-int mtk_dsi_init(u32 mode_flags, u32 format, u32 lanes,
+int mtk_dsi_bpp_from_format(u32 format);
-		 const struct edid *edid);
+int mtk_dsi_init(u32 mode_flags, u32 format, u32 lanes, const struct edid *edid,
+		 const struct lcm_init_command *init_commands);
 
 #endif /* SOC_MEDIATEK_DSI_COMMON_H */