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clock: 获取/设置clk时，不关闭中断（除改变arm clk），只关闭软中断（dsp会在timer中访问），避免断音。减小dsp变频时的delay

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This commit is contained in:
黄涛
2010-09-20 11:58:55 +08:00
parent 627911b0ec
commit 2b02c3c481
1 changed files with 25 additions and 27 deletions
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52
arch/arm/mach-rk2818/clock.c
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@@ -21,6 +21,7 @@
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/list.h>
@@ -405,7 +406,7 @@ static int rockchip_scu_set_arm_pllclk_hw(const struct rockchip_pll_set *ps)
.flags = _flags, \
}
struct rockchip_pll_set arm_pll[] = {
static const struct rockchip_pll_set arm_pll[] = {
// clk_hz = 24*clkf/(clkr*clkod) clkr clkf clkod hdiv pdiv flags (pdiv=1,2,4,no 3!!)
ARM_PLL(576 * SCU_CLK_MHZ, 4, 96, 1, 12, 31, 41, 1),
ARM_PLL(384 * SCU_CLK_MHZ, 3, 96, 2, 8, 21, 41, 1),
@@ -554,12 +555,11 @@ static int rockchip_scu_set_dsp_pllclk_hw(const struct rockchip_pll_set *ps)
const int delay = OTHER_PLL_DELAY;
if (ps->clk_hz == 24 * SCU_CLK_MHZ) {
unsigned long arm_freq_mhz = arm_clk.rate / SCU_CLK_MHZ;
dsp_pll_clk_slow_mode(1);
/* 20100615,HSL@RK,when power down,set pll out=300 M. */
scu_writel_force(ps->pll_con, SCU_DPLL_CON);
pr_debug("set 24M clk, dsp power down\n");
tcm_udelay(delay, arm_freq_mhz);
tcm_udelay(1, 600);
scu_writel_force(scu_readl(SCU_DPLL_CON) | PLL_PD, SCU_DPLL_CON);
} else {
u32 reg_val;
@@ -590,7 +590,7 @@ static int rockchip_scu_set_dsp_pllclk_hw(const struct rockchip_pll_set *ps)
.pll_con = PLL_SAT | PLL_FAST | PLL_CLKR(nr-1) | PLL_CLKF(nf-1) | PLL_CLKOD(od-1), \
}
struct rockchip_pll_set dsp_pll[] = {
static const struct rockchip_pll_set dsp_pll[] = {
// clk_hz = 24*clkf/(clkr*clkod) clkr clkf clkod
DSP_PLL(600 * SCU_CLK_MHZ, 6, 150, 1),
DSP_PLL(560 * SCU_CLK_MHZ, 6, 140, 1),
@@ -1258,14 +1258,14 @@ static int __clk_enable(struct clk *clk)
int clk_enable(struct clk *clk)
{
int ret = 0;
unsigned long flags;
if (clk == NULL || IS_ERR(clk))
return -EINVAL;
spin_lock_irqsave(&clockfw_lock, flags);
WARN_ON(in_irq());
spin_lock_bh(&clockfw_lock);
ret = __clk_enable(clk);
spin_unlock_irqrestore(&clockfw_lock, flags);
spin_unlock_bh(&clockfw_lock);
return ret;
}
@@ -1284,12 +1284,11 @@ static void __clk_disable(struct clk *clk)
void clk_disable(struct clk *clk)
{
unsigned long flags;
if (clk == NULL || IS_ERR(clk))
return;
spin_lock_irqsave(&clockfw_lock, flags);
WARN_ON(in_irq());
spin_lock_bh(&clockfw_lock);
if (clk->usecount == 0) {
printk(KERN_ERR "Trying disable clock %s with 0 usecount\n", clk->name);
WARN_ON(1);
@@ -1299,21 +1298,21 @@ void clk_disable(struct clk *clk)
__clk_disable(clk);
out:
spin_unlock_irqrestore(&clockfw_lock, flags);
spin_unlock_bh(&clockfw_lock);
}
EXPORT_SYMBOL(clk_disable);
unsigned long clk_get_rate(struct clk *clk)
{
unsigned long flags;
unsigned long ret;
if (clk == NULL || IS_ERR(clk))
return 0;
spin_lock_irqsave(&clockfw_lock, flags);
WARN_ON(in_irq());
spin_lock_bh(&clockfw_lock);
ret = clk->rate;
spin_unlock_irqrestore(&clockfw_lock, flags);
spin_unlock_bh(&clockfw_lock);
return ret;
}
@@ -1337,15 +1336,15 @@ static long __clk_round_rate(struct clk *clk, unsigned long rate)
long clk_round_rate(struct clk *clk, unsigned long rate)
{
unsigned long flags;
long ret = 0;
if (clk == NULL || IS_ERR(clk))
return ret;
spin_lock_irqsave(&clockfw_lock, flags);
WARN_ON(in_irq());
spin_lock_bh(&clockfw_lock);
ret = __clk_round_rate(clk, rate);
spin_unlock_irqrestore(&clockfw_lock, flags);
spin_unlock_bh(&clockfw_lock);
return ret;
}
@@ -1369,13 +1368,13 @@ static int __clk_set_rate(struct clk *clk, unsigned long rate)
int clk_set_rate(struct clk *clk, unsigned long rate)
{
unsigned long flags;
int ret = -EINVAL;
if (clk == NULL || IS_ERR(clk))
return ret;
spin_lock_irqsave(&clockfw_lock, flags);
WARN_ON(in_irq());
spin_lock_bh(&clockfw_lock);
if (rate == clk->rate) {
ret = 0;
goto out;
@@ -1387,7 +1386,7 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
propagate_rate(clk);
}
out:
spin_unlock_irqrestore(&clockfw_lock, flags);
spin_unlock_bh(&clockfw_lock);
return ret;
}
@@ -1395,7 +1394,6 @@ EXPORT_SYMBOL(clk_set_rate);
int clk_set_parent(struct clk *clk, struct clk *parent)
{
unsigned long flags;
int ret = -EINVAL;
if (clk == NULL || IS_ERR(clk) || parent == NULL || IS_ERR(parent))
@@ -1404,7 +1402,8 @@ int clk_set_parent(struct clk *clk, struct clk *parent)
if (clk->set_parent == NULL)
return ret;
spin_lock_irqsave(&clockfw_lock, flags);
WARN_ON(in_irq());
spin_lock_bh(&clockfw_lock);
if (clk->usecount == 0) {
ret = clk->set_parent(clk, parent);
if (ret == 0) {
@@ -1415,7 +1414,7 @@ int clk_set_parent(struct clk *clk, struct clk *parent)
}
} else
ret = -EBUSY;
spin_unlock_irqrestore(&clockfw_lock, flags);
spin_unlock_bh(&clockfw_lock);
return ret;
}
@@ -1473,11 +1472,10 @@ static void recalculate_root_clocks(void)
void clk_recalculate_root_clocks(void)
{
unsigned long flags;
spin_lock_irqsave(&clockfw_lock, flags);
WARN_ON(in_irq());
spin_lock_bh(&clockfw_lock);
recalculate_root_clocks();
spin_unlock_irqrestore(&clockfw_lock, flags);
spin_unlock_bh(&clockfw_lock);
}
/**