clk: nomadik: set all timers to use 2.4 MHz TIMCLK

This fixes a regression for the Nomadik on the main system
timers.

The Nomadik seemed a bit slow and its heartbeat wasn't looking
healthy. And it was not strange, because it has been connected
to the 32768 Hz clock at boot, while being told by the clock driver
that it was 2.4MHz. Actually connect the TIMCLK to 2.4MHz by
default as this is what we want for nice scheduling, clocksource
and clock event.

Cc: stable@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

diff --git a/drivers/clk/clk-nomadik.c b/drivers/clk/clk-nomadik.c
index 51410c2ac2cb617b9a98b9c0fd869e1ddd541870..4d978a3c88f743faac72af94b27cd72070507bf9 100644 (file)
--- a/drivers/clk/clk-nomadik.c
+++ b/drivers/clk/clk-nomadik.c
@@ -27,6 +27,14 @@
  */
 
 #define SRC_CR                 0x00U
+#define SRC_CR_T0_ENSEL                BIT(15)
+#define SRC_CR_T1_ENSEL                BIT(17)
+#define SRC_CR_T2_ENSEL                BIT(19)
+#define SRC_CR_T3_ENSEL                BIT(21)
+#define SRC_CR_T4_ENSEL                BIT(23)
+#define SRC_CR_T5_ENSEL                BIT(25)
+#define SRC_CR_T6_ENSEL                BIT(27)
+#define SRC_CR_T7_ENSEL                BIT(29)
 #define SRC_XTALCR             0x0CU
 #define SRC_XTALCR_XTALTIMEN   BIT(20)
 #define SRC_XTALCR_SXTALDIS    BIT(19)
@@ -543,6 +551,19 @@ void __init nomadik_clk_init(void)
                       __func__, np->name);
                return;
        }
+
+       /* Set all timers to use the 2.4 MHz TIMCLK */
+       val = readl(src_base + SRC_CR);
+       val |= SRC_CR_T0_ENSEL;
+       val |= SRC_CR_T1_ENSEL;
+       val |= SRC_CR_T2_ENSEL;
+       val |= SRC_CR_T3_ENSEL;
+       val |= SRC_CR_T4_ENSEL;
+       val |= SRC_CR_T5_ENSEL;
+       val |= SRC_CR_T6_ENSEL;
+       val |= SRC_CR_T7_ENSEL;
+       writel(val, src_base + SRC_CR);
+
        val = readl(src_base + SRC_XTALCR);
        pr_info("SXTALO is %s\n",
                (val & SRC_XTALCR_SXTALDIS) ? "disabled" : "enabled");