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; for (i = 0; i < mux->num_parents; i++) { if (clk_round_rate(mux->parents[i].src, rate) == rate) { new_parent = mux->parents[i].src; 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 (mux->safe_sel >= 0) { /* * 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, parent_to_src_sel(mux->parents, mux->num_parents, c->parent)), "Set rate failed for %s. Also in bad state!\n", c->dbg_name); 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; for (i = 0; i < mux->num_parents; i++) { if (clk_round_rate(mux->parents[i].src, rate) == rate) { new_parent = mux->parents[i].src; break; } } if (new_parent == NULL) return -EINVAL; if (mux->safe_sel >= 0) { 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, parent_to_src_sel(mux->parents, mux->num_parents, c->parent)), "Set rate failed for %s. Also in bad state!\n", c->dbg_name); 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; #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; }