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