New patch to review for coreboot: rockchip/rk3399: display: Update edp initialization retry

[Martin Roth]

Martin Roth ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17642

-gerrit

commit 375705943d1024ea6a548ee1cfd62ff2ac8ae2a2
Author: Martin Roth 
Date:   Tue Nov 29 10:50:52 2016 -0700

rockchip/rk3399: display: Update edp initialization retry

Follow on patch to clean up the previous retry code.
    Previous patches:
    coreboot commit 079b5c65
    (rockchip/rk3399: display: Retry edp initialization if it fails
    cros commit 28c57a6e
    (rockchip/rk3399: display: retry edp initialization if edp initial fail)

- Get rid of the gotos that jump to the retry code from two separate
    locations in the switch statement, then return to just one.
    - Break the retry code out into a separate function that also
    prints the error messages.
    - Create a #define for the Max number of retries, since it's used
    in multiple locations.

BRANCH=gru
    BUG=chrome-os-partner:60150
    TEST=Rebuild Kevin and Gru

Change-Id: I3b6cf572073e4dcac83da09621bafde179af2613
    Signed-off-by: Martin Roth 
---
 src/soc/rockchip/rk3399/display.c | 56 ++++++++++++++++++++++++---------------
 1 file changed, 34 insertions(+), 22 deletions(-)

diff --git a/src/soc/rockchip/rk3399/display.c b/src/soc/rockchip/rk3399/display.c
index 4261b26..c2f83cb 100644
--- a/src/soc/rockchip/rk3399/display.c
+++ b/src/soc/rockchip/rk3399/display.c
@@ -36,6 +36,25 @@

#include "chip.h"

+#define MAX_EDP_RETRIES	3
+
+static int reset_edp(int retry_count)
+{
+	if (retry_count == MAX_EDP_RETRIES) {
+		printk(BIOS_WARNING, "Warning: epd initialization failed.\n");
+		return 1;
+	}
+
+	/* 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));
+	printk(BIOS_WARNING, "Retrying epd initialization.\n");
+	return 0;
+}
+
 void rk_display_init(device_t dev)
 {
    struct edid edid;
@@ -64,15 +83,17 @@ 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;
+		while (retry_count++ < MAX_EDP_RETRIES) {
+			rk_edp_init();
+			if (rk_edp_get_edid(&edid) != 0) {
+				detected_mode = VOP_MODE_EDP;
+				break;
+			}
+			if (reset_edp(retry_count))
+				return;
    	}
-		goto edp_error;
+		return;

-		/* fall thru */
    case VOP_MODE_HDMI:
    	printk(BIOS_WARNING, "HDMI display is NOT supported yet.\n");
    	return;
@@ -100,24 +121,15 @@ retry_edp:
    case VOP_MODE_EDP:
    default:
    	/* will enable edp in depthcharge */
-		if (rk_edp_prepare())
-			goto edp_error;
+		while (retry_count++ < MAX_EDP_RETRIES) {
+			if (rk_edp_prepare() == 0)
+				break;
+			if (reset_edp(retry_count))
+				return;
+		}
    	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");
 }