When the system suspends to LP1, the CPU clock source is switched to
CLK_M (12MHz Oscillator) during suspend/resume flow. The CPU clock
source is controlled by the CCLKG_BURST_POLICY register, and hence this
register must be restored during LP1 resume.
Cc: Mike Turquette <mturquette@xxxxxxxxxx>
Signed-off-by: Joseph Lo <josephl@xxxxxxxxxx>
---
V3:
* move the CCLKG burst policy resume code to tegra_cpu_car_ops
V2:
* update the commit message
---
drivers/clk/tegra/clk-tegra114.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/clk/tegra/clk-tegra114.c b/drivers/clk/tegra/clk-tegra114.c
index f74ed19..806d803 100644
--- a/drivers/clk/tegra/clk-tegra114.c
+++ b/drivers/clk/tegra/clk-tegra114.c
@@ -293,6 +293,8 @@
#ifdef CONFIG_PM_SLEEP
static struct cpu_clk_suspend_context {
u32 clk_csite_src;
+ u32 cclkg_burst;
+ u32 cclkg_divider;
} tegra114_cpu_clk_sctx;
#endif
@@ -2155,12 +2157,22 @@ static void tegra114_cpu_clock_suspend(void)
tegra114_cpu_clk_sctx.clk_csite_src =
readl(clk_base + CLK_SOURCE_CSITE);
writel(3 << 30, clk_base + CLK_SOURCE_CSITE);
+
+ tegra114_cpu_clk_sctx.cclkg_burst =
+ readl(clk_base + CCLKG_BURST_POLICY);
+ tegra114_cpu_clk_sctx.cclkg_divider =
+ readl(clk_base + CCLKG_BURST_POLICY + 4);
}
static void tegra114_cpu_clock_resume(void)
{
writel(tegra114_cpu_clk_sctx.clk_csite_src,
clk_base + CLK_SOURCE_CSITE);
+
+ writel(tegra114_cpu_clk_sctx.cclkg_burst,
+ clk_base + CCLKG_BURST_POLICY);
+ writel(tegra114_cpu_clk_sctx.cclkg_divider,
+ clk_base + CCLKG_BURST_POLICY + 4);
}
#endif
--
1.8.3.4
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