From: Marek Szyprowski <m.szyprowski@samsung.com>
Date: Thu, 17 Sep 2015 10:53:16 +0000 (+0200)
Subject: OdroidXU3: add workaround for MFC crash issue
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8791489a2e7d8ecfcbccc797bb90b344b0d34e6c;p=platform%2Fkernel%2Fu-boot.git

OdroidXU3: add workaround for MFC crash issue

Most versions of MFC v8 firmware suffer from various hang and crash
issues. Most of those issues has been fixed in updated MFC v8 firmware
available for Exynos 5433, however using it on Odroid XU3 sometimes
causes random crashes. In our experiments it turned out that such
firmware works stable after increasing the MFC sclk rate from default
333MHz to 480MHz. This has been achieved by setting ACLK333 clock
divider to 1 (from 2) and setting CPLL rate to 480MHz (from 666MHz).

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Change-Id: Id38d914fddea7fa8fe7144e25cc47948184f9579
---

diff --git a/board/samsung/common/exynos5-dt.c b/board/samsung/common/exynos5-dt.c
index 4d9e151756..1f284fd4a0 100644
--- a/board/samsung/common/exynos5-dt.c
+++ b/board/samsung/common/exynos5-dt.c
@@ -66,6 +66,18 @@ int exynos_init(void)
 {
 	board_enable_audio_codec();
 
+#ifdef EXYNOS5422_MFC_CPLL_FIX
+	/*
+	 * A workaround for MFC crash on Odroid XU3:
+	 * 1. set ACLK333 divider to 1
+	 * 2. set CPLL rate to 480MHz
+	 */
+	writel(0xa0500201, 0x10020120);
+	udelay(10);
+
+	writel(0x03100900, 0x10020504);
+	udelay(10);
+#endif
 	return 0;
 }
 
diff --git a/include/configs/odroid_xu3.h b/include/configs/odroid_xu3.h
index dce2d0681f..b2b8aaef47 100644
--- a/include/configs/odroid_xu3.h
+++ b/include/configs/odroid_xu3.h
@@ -163,4 +163,7 @@
 	"dfu_alt_system="CONFIG_DFU_ALT_SYSTEM \
 	"dfu_alt_info=Autoset by THOR/DFU command run.\0"
 
+/* Hacking */
+#define EXYNOS5422_MFC_CPLL_FIX
+
 #endif	/* __CONFIG_H */