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authorRonald G. Minnich <rminnich@gmail.com>2013-03-04 16:39:35 -0800
committerDavid Hendricks <dhendrix@chromium.org>2013-03-06 22:04:51 +0100
commitf4861df1e749885ec68ea0f17a3589aa6e79d13f (patch)
tree06f1222e4fc99f4aa34de96715129dee101e6edb /src/mainboard/google/snow
parent3914a316c3d3ab1ba45fe33394f37aaefdc62d61 (diff)
google/snow: Change MMC0 to work in 8 bit mode.
The MMC0 on google/snow can run in 8 bit mode. To simplify driver development, we thought disabling it (using zero, which runs in 1-bit / 4-bit mode) may help. However, after some experiments in payload drivers, setting pinmux to 8 bit mode can still allow MMC to run in 1-bit / 4-bit mode, so it's pretty safe to enable 8 bit mode by default for better performance. Verified to boot on google/snow, and got MMC0 working. Change-Id: Ic0acc723fe6a8aecf373429d3801beadd70815d9 Signed-off-by: Ronald G. Minnich <rminnich@gmail.com> Reviewed-on: http://review.coreboot.org/2585 Tested-by: build bot (Jenkins) Reviewed-by: David Hendricks <dhendrix@chromium.org>
Diffstat (limited to 'src/mainboard/google/snow')
-rw-r--r--src/mainboard/google/snow/romstage.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/src/mainboard/google/snow/romstage.c b/src/mainboard/google/snow/romstage.c
index 7e1cd5797b..25c0846a07 100644
--- a/src/mainboard/google/snow/romstage.c
+++ b/src/mainboard/google/snow/romstage.c
@@ -53,7 +53,7 @@ static int board_wakeup_permitted(void)
#endif
static void initialize_s5p_mshc(void) {
- /* MMC0: Fixed, support 8 bit mode, connected with GPIO. */
+ /* MMC0: Fixed, 8 bit mode, connected with GPIO. */
if (clock_set_mshci(PERIPH_ID_SDMMC0))
printk(BIOS_CRIT, "Failed to set clock for SDMMC0.\n");
if (gpio_direction_output(MMC0_GPIO_PIN, 1)) {
@@ -61,9 +61,7 @@ static void initialize_s5p_mshc(void) {
}
gpio_set_pull(MMC0_GPIO_PIN, EXYNOS_GPIO_PULL_NONE);
gpio_set_drv(MMC0_GPIO_PIN, EXYNOS_GPIO_DRV_4X);
- /* TODO(hungte) Change 0 to PINMUX_FLAG_8BIT_MODE when the s5p_mshc
- * driver is ready. */
- exynos_pinmux_config(PERIPH_ID_SDMMC0, 0);
+ exynos_pinmux_config(PERIPH_ID_SDMMC0, PINMUX_FLAG_8BIT_MODE);
/* MMC2: Removable, 4 bit mode, no GPIO. */
clock_set_mshci(PERIPH_ID_SDMMC2);