From 2f7ed8d775153db69d19c77cc79db9b0bb136c70 Mon Sep 17 00:00:00 2001 From: Lin Huang Date: Fri, 8 Apr 2016 18:56:20 +0800 Subject: rockchip: rk3399: configure emmc clk Select aclk_emmc and clk_emmc source from GPLL, and both to 198MHz, that is GPLL(594MHz) divided by 3. BRANCH=none BUG=chrome-os-partner:51537 TEST=boot kevin rev1 to chromeos prompt from both emmc and sdcard TEST=LoadKernel faster, more than twice as I measured manually. Change-Id: I2580c43b8c79049c3fe16bbf60bfa1a8e0559948 Signed-off-by: Martin Roth Original-Commit-Id: 5fd37b66dcce77354e1cafab0d6e806d832c08d2 Original-Change-Id: Id22815b302af3204e0e5537af99c1577b09b0877 Original-Signed-off-by: Lin Huang Original-Signed-off-by: Shunqian Zheng Original-Reviewed-on: https://chromium-review.googlesource.com/339152 Original-Commit-Ready: Vadim Bendebury Original-Tested-by: Vadim Bendebury Original-Reviewed-by: Vadim Bendebury Reviewed-on: https://review.coreboot.org/14855 Tested-by: build bot (Jenkins) Reviewed-by: Vadim Bendebury --- src/mainboard/google/gru/mainboard.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'src/mainboard') diff --git a/src/mainboard/google/gru/mainboard.c b/src/mainboard/google/gru/mainboard.c index 4a5ed4f687..6d2b4f4759 100644 --- a/src/mainboard/google/gru/mainboard.c +++ b/src/mainboard/google/gru/mainboard.c @@ -20,6 +20,20 @@ #include #include +static void configure_emmc(void) +{ + /* Host controller does not support programmable clock generator. + * If we don't do this setting, when we use phy to control the + * emmc clock(when clock exceed 50MHz), it will get wrong clock. + * + * Refer to TRM V0.3 Part 1 Chapter 15 PAGE 782 for this register. + * Please search "_CON11[7:0]" to locate register description. + */ + write32(&rk3399_grf->emmccore_con[11], RK_CLRSETBITS(0xff, 0)); + + rkclk_configure_emmc(); +} + static void configure_sdmmc(void) { gpio_output(GPIO(4, D, 5), 1); /* SDMMC_PWR_EN */ @@ -72,6 +86,7 @@ static void configure_sdmmc(void) static void mainboard_init(device_t dev) { configure_sdmmc(); + configure_emmc(); } static void mainboard_enable(device_t dev) -- cgit v1.2.3