[coreboot-gerrit] New patch to review for coreboot: 1c97210 google/pit: disable SYSMMU for graphics
Stefan Reinauer (stefan.reinauer@coreboot.org)
gerrit at coreboot.org
Tue Dec 3 23:55:36 CET 2013
Stefan Reinauer (stefan.reinauer at coreboot.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/4410
-gerrit
commit 1c97210037b63e4df4369a875270a2c3805cef99
Author: Ronald G. Minnich <rminnich at google.com>
Date: Tue Jul 16 17:30:16 2013 -0700
google/pit: disable SYSMMU for graphics
It's not needed and it's a potential problem source.
Change-Id: Ic4cafe74e7fc3a9031d852895ad7fd5e5cd64d11
Signed-off-by: Ronald G. Minnich <rminnich at google.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/62279
Commit-Queue: David Hendricks <dhendrix at chromium.org>
Reviewed-by: David Hendricks <dhendrix at chromium.org>
Tested-by: David Hendricks <dhendrix at chromium.org>
---
src/mainboard/google/pit/mainboard.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/src/mainboard/google/pit/mainboard.c b/src/mainboard/google/pit/mainboard.c
index 042ced0..04010ac 100644
--- a/src/mainboard/google/pit/mainboard.c
+++ b/src/mainboard/google/pit/mainboard.c
@@ -325,6 +325,15 @@ static void mainboard_init(device_t dev)
set_vbe_mode_info_valid(&edid, (uintptr_t)fb_addr);
+ /*
+ * The reset value for FIMD SYSMMU register MMU_CTRL:0x14640000
+ * should be 0 according to the datasheet, but has experimentally
+ * been found to come up as 3. This means FIMD SYSMMU is on by
+ * default on Exynos5420. For now we are disabling FIMD SYSMMU.
+ */
+ writel(0x0, (void *)0x14640000);
+ writel(0x0, (void *)0x14680000);
+
lcd_vdd();
parade_dp_bridge_setup();
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