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authorRonald G. Minnich <rminnich@google.com>2013-07-16 17:30:16 -0700
committerPatrick Georgi <patrick@georgi-clan.de>2013-12-21 18:00:00 +0100
commit88750cb3b60fa1d351a69b35ff10c739f4f4e8ce (patch)
tree5a1dee399cf34159e8938ff2060ae02a5aa472c5 /src/mainboard
parentea3a463460fcc679a25fd8d028fa01515164abae (diff)
downloadcoreboot-88750cb3b60fa1d351a69b35ff10c739f4f4e8ce.tar.xz
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@google.com> Reviewed-on: https://gerrit.chromium.org/gerrit/62279 Commit-Queue: David Hendricks <dhendrix@chromium.org> Reviewed-by: David Hendricks <dhendrix@chromium.org> Tested-by: David Hendricks <dhendrix@chromium.org> Reviewed-on: http://review.coreboot.org/4410 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Diffstat (limited to 'src/mainboard')
-rw-r--r--src/mainboard/google/pit/mainboard.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/mainboard/google/pit/mainboard.c b/src/mainboard/google/pit/mainboard.c
index 28704677a6..d0230e26f1 100644
--- a/src/mainboard/google/pit/mainboard.c
+++ b/src/mainboard/google/pit/mainboard.c
@@ -326,6 +326,15 @@ static void mainboard_init(device_t dev)
fb_addr = cbmem_find(CBMEM_ID_CONSOLE);
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();