static int mux_set_parent(struct clk *c, struct clk *p)
{
struct mux_clk *mux = to_mux_clk(c);
int sel = mux_parent_to_src_sel(mux, p);
struct clk *old_parent;
int rc = 0, i;
unsigned long flags;
if (sel < 0 && mux->rec_parents) {
for (i = 0; i < mux->num_rec_parents; i++) {
rc = clk_set_parent(mux->rec_parents[i], p);
if (!rc) {
/*
* This is necessary to ensure prepare/enable
* counts get propagated correctly.
*/
p = mux->rec_parents[i];
sel = mux_parent_to_src_sel(mux, p);
break;
}
}
}
if (sel < 0)
return sel;
rc = __clk_pre_reparent(c, p, &flags);
if (rc)
goto out;
rc = mux->ops->set_mux_sel(mux, sel);
if (rc)
goto set_fail;
old_parent = c->parent;
c->parent = p;
c->rate = clk_get_rate(p);
__clk_post_reparent(c, old_parent, &flags);
return 0;
set_fail:
__clk_post_reparent(c, p, &flags);
out:
return rc;
}
static enum handoff mux_handoff(struct clk *c)
{
struct mux_clk *mux = to_mux_clk(c);
c->rate = clk_get_rate(c->parent);
mux->safe_sel = mux_parent_to_src_sel(mux, mux->safe_parent);
if (mux->en_mask && mux->ops && mux->ops->is_enabled)
return mux->ops->is_enabled(mux)
? HANDOFF_ENABLED_CLK
: HANDOFF_DISABLED_CLK;
return HANDOFF_DISABLED_CLK;
}
static enum handoff mux_handoff(struct clk *c)
{
struct mux_clk *mux = to_mux_clk(c);
c->rate = clk_get_rate(c->parent);
mux->safe_sel = mux_parent_to_src_sel(mux, mux->safe_parent);
if (mux->en_mask && mux->ops && mux->ops->is_enabled)
return mux->ops->is_enabled(mux)
? HANDOFF_ENABLED_CLK
: HANDOFF_DISABLED_CLK;
/*
* If this function returns 'enabled' even when the clock downstream
* of this clock is disabled, then handoff code will unnecessarily
* enable the current parent of this clock. If this function always
* returns 'disabled' and a clock downstream is on, the clock handoff
* code will bump up the ref count for this clock and its current
* parent as necessary. So, clocks without an actual HW gate can
* always return disabled.
*/
return HANDOFF_DISABLED_CLK;
}
static int mux_set_rate(struct clk *c, unsigned long rate)
{
struct mux_clk *mux = to_mux_clk(c);
struct clk *new_parent = NULL;
int rc = 0, i;
unsigned long new_par_curr_rate;
unsigned long flags;
#if defined(CONFIG_HTC_DEBUG_FOOTPRINT)
set_acpuclk_footprint_by_clk(c, ACPU_BEFORE_SAFE_PARENT_INIT);
#endif
for (i = 0; i < mux->num_parents && mux->try_get_rate; i++) {
struct clk *p = mux->parents[i].src;
if (p->rate == rate && clk_round_rate(p, rate) == rate) {
new_parent = mux->parents[i].src;
break;
}
}
for (i = 0; i < mux->num_parents && !(!i && new_parent); i++) {
if (clk_round_rate(mux->parents[i].src, rate) == rate) {
new_parent = mux->parents[i].src;
if (!mux->try_new_parent)
break;
if (mux->try_new_parent && new_parent != c->parent)
break;
}
}
if (new_parent == NULL)
return -EINVAL;
#if defined(CONFIG_HTC_DEBUG_FOOTPRINT)
set_acpuclk_footprint_by_clk(c, ACPU_BEFORE_SET_SAFE_RATE);
#endif
if (mux->safe_sel >= 0 &&
!(mux->try_new_parent && (new_parent != c->parent))) {
if (mux->safe_freq) {
rc = clk_set_rate(mux->safe_parent, mux->safe_freq);
if (rc) {
pr_err("Failed to set safe rate on %s\n",
clk_name(mux->safe_parent));
return rc;
}
}
spin_lock_irqsave(&c->lock, flags);
rc = mux->ops->set_mux_sel(mux, mux->safe_sel);
spin_unlock_irqrestore(&c->lock, flags);
if (rc)
return rc;
}
#if defined(CONFIG_HTC_DEBUG_FOOTPRINT)
set_acpuclk_footprint_by_clk(c, ACPU_BEFORE_SET_PARENT_RATE);
#endif
new_par_curr_rate = clk_get_rate(new_parent);
rc = clk_set_rate(new_parent, rate);
if (rc)
goto set_rate_fail;
#if defined(CONFIG_HTC_DEBUG_FOOTPRINT)
set_acpuclk_footprint_by_clk(c, ACPU_BEFORE_CLK_UNPREPARE);
#endif
rc = mux_set_parent(c, new_parent);
if (rc)
goto set_par_fail;
#if defined(CONFIG_HTC_DEBUG_FOOTPRINT)
set_acpuclk_cpu_freq_footprint_by_clk(FT_CUR_RATE, c, rate);
set_acpuclk_l2_freq_footprint_by_clk(FT_CUR_RATE, c, rate);
#endif
#if defined(CONFIG_HTC_DEBUG_FOOTPRINT)
set_acpuclk_footprint_by_clk(c, ACPU_BEFORE_RETURN);
#endif
return 0;
set_par_fail:
#if defined(CONFIG_HTC_DEBUG_FOOTPRINT)
set_acpuclk_footprint_by_clk(c, ACPU_BEFORE_ERR_CLK_UNPREPARE);
#endif
clk_set_rate(new_parent, new_par_curr_rate);
set_rate_fail:
#if defined(CONFIG_HTC_DEBUG_FOOTPRINT)
set_acpuclk_footprint_by_clk(c, ACPU_BEFORE_ERR_SET_PARENT_RATE);
#endif
WARN(mux->ops->set_mux_sel(mux,
mux_parent_to_src_sel(mux, c->parent)),
"Set rate failed for %s. Also in bad state!\n", c->dbg_name);
#if defined(CONFIG_HTC_DEBUG_FOOTPRINT)
set_acpuclk_footprint_by_clk(c, ACPU_BEFORE_ERR_RETURN);
#endif
return rc;
}
static int mux_set_rate(struct clk *c, unsigned long rate)
{
struct mux_clk *mux = to_mux_clk(c);
struct clk *new_parent = NULL;
int rc = 0, i;
unsigned long new_par_curr_rate;
unsigned long flags;
/*
* Check if one of the possible parents is already at the requested
* rate.
*/
for (i = 0; i < mux->num_parents && mux->try_get_rate; i++) {
struct clk *p = mux->parents[i].src;
if (p->rate == rate && clk_round_rate(p, rate) == rate) {
new_parent = mux->parents[i].src;
break;
}
}
for (i = 0; i < mux->num_parents && !(!i && new_parent); i++) {
if (clk_round_rate(mux->parents[i].src, rate) == rate) {
new_parent = mux->parents[i].src;
if (!mux->try_new_parent)
break;
if (mux->try_new_parent && new_parent != c->parent)
break;
}
}
if (new_parent == NULL)
return -EINVAL;
/*
* Switch to safe parent since the old and new parent might be the
* same and the parent might temporarily turn off while switching
* rates. If the mux can switch between distinct sources safely
* (indicated by try_new_parent), and the new source is not the current
* parent, do not switch to the safe parent.
*/
if (mux->safe_sel >= 0 &&
!(mux->try_new_parent && (new_parent != c->parent))) {
/*
* The safe parent might be a clock with multiple sources;
* to select the "safe" source, set a safe frequency.
*/
if (mux->safe_freq) {
rc = clk_set_rate(mux->safe_parent, mux->safe_freq);
if (rc) {
pr_err("Failed to set safe rate on %s\n",
clk_name(mux->safe_parent));
return rc;
}
}
/*
* Some mux implementations might switch to/from a low power
* parent as part of their disable/enable ops. Grab the
* enable lock to avoid racing with these implementations.
*/
spin_lock_irqsave(&c->lock, flags);
rc = mux->ops->set_mux_sel(mux, mux->safe_sel);
spin_unlock_irqrestore(&c->lock, flags);
if (rc)
return rc;
}
new_par_curr_rate = clk_get_rate(new_parent);
rc = clk_set_rate(new_parent, rate);
if (rc)
goto set_rate_fail;
rc = mux_set_parent(c, new_parent);
if (rc)
goto set_par_fail;
return 0;
set_par_fail:
clk_set_rate(new_parent, new_par_curr_rate);
set_rate_fail:
WARN(mux->ops->set_mux_sel(mux,
mux_parent_to_src_sel(mux, c->parent)),
"Set rate failed for %s. Also in bad state!\n", c->dbg_name);
return rc;
}
