Some NM PLLs doesn't work well when their output clock rate is set below certain rate.
Add support for that constrain.
Signed-off-by: Jernej Skrabec jernej.skrabec@siol.net --- drivers/clk/sunxi-ng/ccu_nm.c | 7 +++++++ drivers/clk/sunxi-ng/ccu_nm.h | 27 +++++++++++++++++++++++++++ 2 files changed, 34 insertions(+)
diff --git a/drivers/clk/sunxi-ng/ccu_nm.c b/drivers/clk/sunxi-ng/ccu_nm.c index a16de092bf94..4e2073307f34 100644 --- a/drivers/clk/sunxi-ng/ccu_nm.c +++ b/drivers/clk/sunxi-ng/ccu_nm.c @@ -117,6 +117,13 @@ static long ccu_nm_round_rate(struct clk_hw *hw, unsigned long rate, if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV) rate *= nm->fixed_post_div;
+ if (rate < nm->min_rate) { + rate = nm->min_rate; + if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV) + rate /= nm->fixed_post_div; + return rate; + } + if (ccu_frac_helper_has_rate(&nm->common, &nm->frac, rate)) { if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV) rate /= nm->fixed_post_div; diff --git a/drivers/clk/sunxi-ng/ccu_nm.h b/drivers/clk/sunxi-ng/ccu_nm.h index eba586b4c7d0..1d8b459c50b7 100644 --- a/drivers/clk/sunxi-ng/ccu_nm.h +++ b/drivers/clk/sunxi-ng/ccu_nm.h @@ -37,6 +37,7 @@ struct ccu_nm { struct ccu_sdm_internal sdm;
unsigned int fixed_post_div; + unsigned int min_rate;
struct ccu_common common; }; @@ -88,6 +89,32 @@ struct ccu_nm { }, \ }
+#define SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN(_struct, _name, _parent, \ + _reg, _min_rate, \ + _nshift, _nwidth, \ + _mshift, _mwidth, \ + _frac_en, _frac_sel, \ + _frac_rate_0, _frac_rate_1,\ + _gate, _lock, _flags) \ + struct ccu_nm _struct = { \ + .enable = _gate, \ + .lock = _lock, \ + .n = _SUNXI_CCU_MULT(_nshift, _nwidth), \ + .m = _SUNXI_CCU_DIV(_mshift, _mwidth), \ + .frac = _SUNXI_CCU_FRAC(_frac_en, _frac_sel, \ + _frac_rate_0, \ + _frac_rate_1), \ + .min_rate = _min_rate, \ + .common = { \ + .reg = _reg, \ + .features = CCU_FEATURE_FRACTIONAL, \ + .hw.init = CLK_HW_INIT(_name, \ + _parent, \ + &ccu_nm_ops, \ + _flags), \ + }, \ + } + #define SUNXI_CCU_NM_WITH_GATE_LOCK(_struct, _name, _parent, _reg, \ _nshift, _nwidth, \ _mshift, _mwidth, \