i.MX6 USDHC: Use the ESDHC clock

The commit "i.mx: fsl_esdhc: add the i.mx6q support" (4692708d) introduces
support for the i.MX6Q MMC host controller USDHC.

MXC_IPG_PERCLK sets the clock to 66MHz. This seems to be the default clock
of the ESDHC IP found in < i.MX6 silicon. However, the default clock for the USDHC
IP found in i.MX6 is 200MHz (MXC_ESDHC_CLK). This difference will cause a 3 times
higher clock on SD_CLK than expected (see fsl_esdh.c -> set_sysctl()).

Signed-off-by: Michael Langer <[email protected]>
CC: Stefano Babic <[email protected]>
CC: Jason Liu <[email protected]>
Acked-by: Stefano Babic <[email protected]>

diff --git a/arch/arm/cpu/armv7/imx-common/speed.c b/arch/arm/cpu/armv7/imx-common/speed.c
index 2187e8ee5deb5d334c0308342aa3caad98a6f78f..80989c49837a3714701df8bf10112cceace4347a 100644 (file)
--- a/arch/arm/cpu/armv7/imx-common/speed.c
+++ b/arch/arm/cpu/armv7/imx-common/speed.c
@@ -35,7 +35,11 @@ DECLARE_GLOBAL_DATA_PTR;
 int get_clocks(void)
 {
 #ifdef CONFIG_FSL_ESDHC
+#ifdef CONFIG_FSL_USDHC
+       gd->sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK);
+#else
        gd->sdhc_clk = mxc_get_clock(MXC_IPG_PERCLK);
+#endif
 #endif
        return 0;
 }