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@amarulasolutions.com Acked-by: Stephen Boyd sboyd@kernel.org Tested-by: Jagan Teki jagan@amarulasolutions.com --- 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; };