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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>
This commit is contained in:
Ronald G. Minnich 2013-07-16 17:30:16 -07:00 committed by Patrick Georgi
parent ea3a463460
commit 88750cb3b6
1 changed files with 9 additions and 0 deletions
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9
src/mainboard/google/pit/mainboard.c
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@ -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();