ARM: at91: clock: fix the GCK's clock source
Before enabling a generated clock whose source is from the UPLL
clock, check and enable the UPLL clock.
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Andreas Bießmann <andreas@biessmann.org>
diff --git a/arch/arm/mach-at91/armv7/clock.c b/arch/arm/mach-at91/armv7/clock.c
index 81e9f69..27372b3 100644
--- a/arch/arm/mach-at91/armv7/clock.c
+++ b/arch/arm/mach-at91/armv7/clock.c
@@ -162,6 +162,11 @@
if (div > 0xff)
return -EINVAL;
+ if (clk_source == GCK_CSS_UPLL_CLK) {
+ if (at91_upll_clk_enable())
+ return -ENODEV;
+ }
+
writel(id, &pmc->pcr);
regval = readl(&pmc->pcr);
regval &= ~AT91_PMC_PCR_GCKCSS;