Some NKM PLLs doesn't work well when their output clock rate is set below
certain rate.
So, add support for minimal rate for relevant PLLs.
Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
Acked-by: Stephen Boyd <sboyd@xxxxxxxxxx>
Tested-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
---
Changes for v3:
- collect Stephen Ack
- add tested credit
Changes for v2:
- none
drivers/clk/sunxi-ng/ccu_nkm.c | 7 +++++++
drivers/clk/sunxi-ng/ccu_nkm.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
index 841840e35e61..d17539dc88dd 100644
--- a/drivers/clk/sunxi-ng/ccu_nkm.c
+++ b/drivers/clk/sunxi-ng/ccu_nkm.c
@@ -125,6 +125,13 @@ static unsigned long ccu_nkm_round_rate(struct ccu_mux_internal *mux,
if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
rate *= nkm->fixed_post_div;
+ if (rate < nkm->min_rate) {
+ rate = nkm->min_rate;
+ if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
+ rate /= nkm->fixed_post_div;
+ return rate;
+ }
+
ccu_nkm_find_best(*parent_rate, rate, &_nkm);
rate = *parent_rate * _nkm.n * _nkm.k / _nkm.m;
diff --git a/drivers/clk/sunxi-ng/ccu_nkm.h b/drivers/clk/sunxi-ng/ccu_nkm.h
index cc6efb70a102..ff5bd00f429f 100644
--- a/drivers/clk/sunxi-ng/ccu_nkm.h
+++ b/drivers/clk/sunxi-ng/ccu_nkm.h
@@ -35,6 +35,7 @@ struct ccu_nkm {
struct ccu_mux_internal mux;
unsigned int fixed_post_div;
+ unsigned int min_rate;
struct ccu_common common;
};
--
2.18.0.321.gffc6fa0e3
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