sc7180: Add display dsi interface programming

This change adds support for sc7180 dsi interface host programming.

Changes in V1:
- remove dual dsi config code.
- update register access using struct overlays.
- remove dsc config & command mode code.

Changes in V2:
- remove dsi read and write functions.
- remove target and panel related code.

Changes in V3:
- move prototypes to headers.
- define macros for constants.

Changes in V4:
- define register bits instead of hardcoded values.

Change-Id: Ie64354ce8bc2a64b891fb9478fbca38d6ec4c321
Signed-off-by: Vinod Polimera <vpolimer@codeaurora.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39614
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

3 files changed, 189 insertions, 0 deletions

diff --git a/src/soc/qualcomm/sc7180/Makefile.inc b/src/soc/qualcomm/sc7180/Makefile.inc
index bcb49657f7..ec6ab6c162 100644
--- a/src/soc/qualcomm/sc7180/Makefile.inc
+++ b/src/soc/qualcomm/sc7180/Makefile.inc
@@ -61,6 +61,7 @@ ramstage-y += qcom_qup_se.c
 ramstage-$(CONFIG_DRIVERS_UART) += qupv3_uart.c
 ramstage-$(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT) += display/dsi_phy_pll.c
 ramstage-$(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT) += display/dsi_phy.c
+ramstage-$(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT) += display/dsi.c
 
 ################################################################################
 
diff --git a/src/soc/qualcomm/sc7180/display/dsi.c b/src/soc/qualcomm/sc7180/display/dsi.c
new file mode 100644
index 0000000000..016531bda3
--- /dev/null
+++ b/src/soc/qualcomm/sc7180/display/dsi.c
@@ -0,0 +1,161 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/mmio.h>
+#include <console/console.h>
+#include <edid.h>
+#include <types.h>
+#include <soc/display/mdssreg.h>
+#include <soc/display/mipi_dsi.h>
+#include <soc/display/dsi_phy.h>
+
+#define DSI_DMA_STREAM1 0x0
+#define DSI_EMBED_MODE1 0x1
+#define DSI_POWER_MODE2 0x1
+#define DSI_PACK_TYPE1 0x0
+#define DSI_VC1 0x0
+#define DSI_DT1 0x0
+#define DSI_WC1 0x0
+#define DSI_EOF_BLLP_PWR 0x9
+#define DSI_DMA_TRIGGER_SEL 0x4
+
+#define DSI_EN 0x1
+#define DSI_CLKLN_EN 0x1
+#define DSI_VIDEO_EN 0x1
+
+#define HS_TX_TO 0xEA60
+#define TIMER_RESOLUTION 0x4
+
+static void mdss_dsi_host_init(int num_of_lanes)
+{
+	uint8_t dlnx_en;
+	uint32_t ctrl_mode = BIT(8) | BIT(0); /* Enable DSI and CLKlane. */
+
+	switch (num_of_lanes) {
+	default:
+	case 1:
+		dlnx_en = 1;
+		break;
+
+	case 2:
+		dlnx_en = 3;
+		break;
+
+	case 3:
+		dlnx_en = 7;
+		break;
+
+	case 4:
+		dlnx_en = 0x0F;
+		break;
+	}
+
+	/*
+	 * Need to send pixel data before sending the ON commands
+	 * so need to configure controller to VIDEO MODE.
+	 */
+	ctrl_mode |= BIT(1);
+
+	write32(&dsi0->trig_ctrl, DSI_DMA_STREAM1 << 8 | DSI_DMA_TRIGGER_SEL);
+	write32(&dsi0->ctrl, dlnx_en << 4 | ctrl_mode);
+	write32(&dsi0->cmd_mode_dma_ctrl,
+		   DSI_EMBED_MODE1 << 28 | DSI_POWER_MODE2 << 26 |
+	       DSI_PACK_TYPE1 << 24 | DSI_VC1 << 22 | DSI_DT1 << 16 | DSI_WC1);
+}
+
+static void mdss_dsi_reset(void)
+{
+	/*
+	 * Disable DSI Controller, DSI lane states,
+	 * DSI command-mode and DSI video-mode engines
+	 */
+	write32(&dsi0->ctrl, 0x0);
+
+	/* DSI soft reset */
+	write32(&dsi0->soft_reset, 0x1);
+	write32(&dsi0->soft_reset, 0x0);
+
+	/* set hs timer count speed */
+	write32(&dsi0->hs_timer_ctrl, HS_TX_TO | TIMER_RESOLUTION << 16);
+
+	/* dma fifo reset */
+	write32(&dsi0->tpg_dma_fifo_reset, 0x1);
+	write32(&dsi0->tpg_dma_fifo_reset, 0x0);
+}
+
+void mdss_dsi_video_mode_config(struct edid *edid, uint32_t bpp)
+{
+	uint16_t dst_format;
+	uint8_t lane_en = 15; /* Enable 4 lanes by default */
+	uint16_t hfp, hbp, vfp, vbp;
+
+	switch (bpp) {
+	case 16:
+		dst_format = DSI_VIDEO_DST_FORMAT_RGB565;
+		break;
+	case 18:
+		dst_format = DSI_VIDEO_DST_FORMAT_RGB666;
+		break;
+	case 24:
+	default:
+		dst_format = DSI_VIDEO_DST_FORMAT_RGB888;
+		break;
+	}
+
+	hfp = edid->mode.hso;
+	hbp = edid->mode.hbl - edid->mode.hso;
+	vfp = edid->mode.vso;
+	vbp = edid->mode.vbl - edid->mode.vso;
+
+	mdss_dsi_clock_config();
+
+	write32(&dsi0->video_mode_active_h,
+		((edid->mode.ha + hbp) << 16) |
+		hbp);
+
+	write32(&dsi0->video_mode_active_v,
+		((edid->mode.va + vbp) << 16) | (vbp));
+
+	write32(&dsi0->video_mode_active_total,
+		((edid->mode.va + vfp +
+		 vbp - 1) << 16) |
+		(edid->mode.ha + hfp +
+		 hbp - 1));
+
+	write32(&dsi0->video_mode_active_hsync, (edid->mode.hspw << 16) | 0);
+	write32(&dsi0->video_mode_active_vsync, 0x0);
+	write32(&dsi0->video_mode_active_vsync_vpos, edid->mode.vspw << 16 | 0);
+
+	write32(&dsi0->video_mode_ctrl,
+			DSI_EOF_BLLP_PWR << 12 | dst_format << 4);
+
+	write32(&dsi0->hs_timer_ctrl, HS_TX_TO | TIMER_RESOLUTION << 16);
+
+	write32(&dsi0->ctrl, lane_en << 4 | DSI_VIDEO_EN << 1 | DSI_EN | DSI_CLKLN_EN << 8);
+}
+
+enum cb_err mdss_dsi_config(struct edid *edid, uint32_t num_of_lanes, uint32_t bpp)
+{
+	mdss_dsi_reset();
+	if ((mdss_dsi_phy_10nm_init(edid, num_of_lanes, bpp)) != 0) {
+		printk(BIOS_ERR, "dsi phy setup returned error\n");
+		return CB_ERR;
+	}
+
+	mdss_dsi_host_init(num_of_lanes);
+
+	return CB_SUCCESS;
+}
+
+void mdss_dsi_clock_config(void)
+{
+	/* Clock for AHI Bus Master, for DMA out from memory */
+	write32(&dsi0->clk_ctrl, 0);
+	setbits32(&dsi0->clk_ctrl, DSI_AHBM_SCLK_ON | DSI_FORCE_ON_DYN_AHBM_HCLK);
+
+	/* Clock for MDP/DSI, for DMA out from MDP */
+	setbits32(&dsi0->clk_ctrl, DSI_FORCE_ON_DYN_AHBM_HCLK);
+
+	/* Clock for rest of DSI */
+	setbits32(&dsi0->clk_ctrl, DSI_AHBS_HCLK_ON | DSI_DSICLK_ON |
+		  DSI_BYTECLK_ON | DSI_ESCCLK_ON);
+}
diff --git a/src/soc/qualcomm/sc7180/include/soc/display/mipi_dsi.h b/src/soc/qualcomm/sc7180/include/soc/display/mipi_dsi.h
new file mode 100644
index 0000000000..47fd3084c6
--- /dev/null
+++ b/src/soc/qualcomm/sc7180/include/soc/display/mipi_dsi.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _SOC_DISPLAY_MIPI_DSI_H_
+#define _SOC_DISPLAY_MIPI_DSI_H_
+
+/**********************************************************
+  DSI register configuration options
+ **********************************************************/
+#define MIPI_DSI_MRPS			0x04	/* Maximum Return Packet Size */
+#define MIPI_DSI_REG_LEN		16	/* 4 x 4 bytes register */
+
+#define DSI_VIDEO_DST_FORMAT_RGB565		0
+#define DSI_VIDEO_DST_FORMAT_RGB666		1
+#define DSI_VIDEO_DST_FORMAT_RGB666_LOOSE	2
+#define DSI_VIDEO_DST_FORMAT_RGB888		3
+
+enum {
+	DSI_VIDEO_MODE,
+	DSI_CMD_MODE,
+};
+
+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);
+
+#endif