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.skra...@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, \
--
2.16.2
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
