1 files changed, 10 insertions, 0 deletions

diff --git a/arch/arc/plat-hsdk/platform.c b/arch/arc/plat-hsdk/platform.c
index 744e62e58788..fd0ae5e38639 100644
--- a/arch/arc/plat-hsdk/platform.c
+++ b/arch/arc/plat-hsdk/platform.c
@@ -74,6 +74,10 @@ static void __init hsdk_set_cpu_freq_1ghz(void)
                 pr_err("Failed to setup CPU frequency to 1GHz!");
 }
 
+#define SDIO_BASE               (ARC_PERIPHERAL_BASE + 0xA000)
+#define SDIO_UHS_REG_EXT        (SDIO_BASE + 0x108)
+#define SDIO_UHS_REG_EXT_DIV_2  (2 << 30)
+
 static void __init hsdk_init_early(void)
 {
         /*
@@ -90,6 +94,12 @@ static void __init hsdk_init_early(void)
         writel(1, (void __iomem *) CREG_PAE_UPDATE);
 
         /*
+         * Switch SDIO external ciu clock divider from default div-by-8 to
+         * minimum possible div-by-2.
+         */
+        iowrite32(SDIO_UHS_REG_EXT_DIV_2, (void __iomem *) SDIO_UHS_REG_EXT);
+
+        /*
          * Setup CPU frequency to 1GHz.
          * TODO: remove it after smart hsdk pll driver will be introduced.
          */