New patch to review for coreboot: rockchip/rk3399: display: retry edp initialization if edp initial fail

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17626

-gerrit

commit d96e4b1a9635bed868d08b43022b8c3aa96626ca
Author: Lin Huang 
Date:   Mon Nov 21 17:35:20 2016 +0800

rockchip/rk3399: display: retry edp initialization if edp initial fail

we found sometime edp get the edid or config video fail on kevin
    board after reboot. Now we will retry 3 times to initial edp if
    we found there are error happen in edp initial process.

BRANCH=gru
    BUG=chrome-os-partner:60150
    TEST=reboot on kevin, not found edp initialization error again.

Change-Id: I96e20e526294fbc856fbdffcbd63accdc7371ef6
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 28c57a6e5b89c7b3a96204ec19a080067460544a
    Original-Change-Id: I1382cdf4119fc4eeae5c2b36485030e3a38c2d91
    Original-Signed-off-by: Lin Huang 
    Original-Reviewed-on: https://chromium-review.googlesource.com/412622
    Original-Reviewed-by: Julius Werner 
---
 src/soc/rockchip/rk3399/display.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/src/soc/rockchip/rk3399/display.c b/src/soc/rockchip/rk3399/display.c
index 671e518..4261b26 100644
--- a/src/soc/rockchip/rk3399/display.c
+++ b/src/soc/rockchip/rk3399/display.c
@@ -41,6 +41,7 @@ void rk_display_init(device_t dev)
    struct edid edid;
    struct soc_rockchip_rk3399_config *conf = dev->chip_info;
    enum vop_modes detected_mode = VOP_MODE_UNKNOWN;
+	int retry_count = 0;

/* let's use vop0 in rk3399 */
    uint32_t vop_id = 0;
@@ -63,15 +64,14 @@ void rk_display_init(device_t dev)
    	 */
    	write32(&rk3399_grf->soc_con25, RK_SETBITS(1 << 11));

+retry_edp:
    	rk_edp_init();
-
    	if (rk_edp_get_edid(&edid) == 0) {
    		detected_mode = VOP_MODE_EDP;
    		break;
    	}
-		printk(BIOS_WARNING, "Cannot get EDID from EDP.\n");
-		if (conf->vop_mode == VOP_MODE_EDP)
-			return;
+		goto edp_error;
+
    	/* fall thru */
    case VOP_MODE_HDMI:
    	printk(BIOS_WARNING, "HDMI display is NOT supported yet.\n");
@@ -100,13 +100,24 @@ void rk_display_init(device_t dev)
    case VOP_MODE_EDP:
    default:
    	/* will enable edp in depthcharge */
-		if (rk_edp_prepare()) {
-			printk(BIOS_WARNING, "edp prepare error\n");
-			return;
-		}
+		if (rk_edp_prepare())
+			goto edp_error;
    	mainboard_power_on_backlight();
    	break;
    }

set_vbe_mode_info_valid(&edid, (uintptr_t)0);
+	return;
+
+edp_error:
+	if (retry_count++ < 3) {
+		/* rst edp */
+		write32(&cru_ptr->softrst_con[17],
+			RK_SETBITS(1 << 12 | 1 << 13));
+			udelay(1);
+		write32(&cru_ptr->softrst_con[17],
+			RK_CLRBITS(1 << 12 | 1 << 13));
+		goto retry_edp;
+	}
+	printk(BIOS_WARNING, "epd initial error\n");
 }