imx8m: clock: improve irq response latency

Improve the IRQ response latency by setting GIC root clock source to
sys_pll2_200m from osc.

Signed-off-by: Peng Fan <peng.fan@nxp.com>

diff --git a/arch/arm/mach-imx/imx8m/clock_imx8mq.c b/arch/arm/mach-imx/imx8m/clock_imx8mq.c
index 5c3f780127b6ac3abff7d653a208510fc5b8f32d..04903510f07e0d5e7e903ab741c1362f7c001c49 100644 (file)
--- a/arch/arm/mach-imx/imx8m/clock_imx8mq.c
+++ b/arch/arm/mach-imx/imx8m/clock_imx8mq.c
@@ -806,6 +806,12 @@ int clock_init(void)
        clock_enable(CCGR_TSENSOR, 1);
        clock_enable(CCGR_OCOTP, 1);
 
+       /* config GIC ROOT to sys_pll2_200m */
+       clock_enable(CCGR_GIC, 0);
+       clock_set_target_val(GIC_CLK_ROOT,
+                            CLK_ROOT_ON | CLK_ROOT_SOURCE_SEL(1));
+       clock_enable(CCGR_GIC, 1);
+
        return 0;
 }
 #endif