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rk: ddr_freq: restore ddr freq when shutdown/reboot

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version 2.2
This commit is contained in:
黄涛
2013-02-04 11:32:37 +08:00
parent 50c21e8e19
commit a2b6f33b9a
1 changed files with 30 additions and 5 deletions
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35
arch/arm/plat-rk/ddr_freq.c
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@@ -9,6 +9,7 @@
#include <linux/kthread.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
@@ -37,6 +38,7 @@ enum SYS_STATUS {
SYS_STATUS_RGA, // 0x08
SYS_STATUS_CIF0, // 0x10
SYS_STATUS_CIF1, // 0x20
SYS_STATUS_REBOOT, // 0x40
};
struct ddr {
@@ -49,6 +51,7 @@ struct ddr {
unsigned long video_rate;
unsigned long idle_rate;
unsigned long suspend_rate;
unsigned long reboot_rate;
char video_state;
bool auto_self_refresh;
char *mode;
@@ -102,7 +105,9 @@ static noinline void ddrfreq_work(unsigned long sys_status)
if (!gpu)
gpu = clk_get(NULL, "gpu");
dprintk(DEBUG_VERBOSE, "sys_status %02lx\n", sys_status);
if (ddr.suspend_rate && (s & (1 << SYS_STATUS_SUSPEND))) {
if (ddr.reboot_rate && (s & (1 << SYS_STATUS_REBOOT))) {
ddrfreq_mode(false, &ddr.reboot_rate, "shutdown/reboot");
} else if (ddr.suspend_rate && (s & (1 << SYS_STATUS_SUSPEND))) {
ddrfreq_mode(true, &ddr.suspend_rate, "suspend");
} else if (ddr.video_rate && (s & (1 << SYS_STATUS_VIDEO))) {
ddrfreq_mode(false, &ddr.video_rate, "video");
@@ -303,6 +308,23 @@ CLK_NOTIFIER(pd_rga, RGA);
CLK_NOTIFIER(pd_cif0, CIF0);
CLK_NOTIFIER(pd_cif1, CIF1);
static int ddrfreq_reboot_notifier_event(struct notifier_block *this, unsigned long event, void *ptr)
{
u32 timeout = 1000; // 10s
ddrfreq_set_sys_status(SYS_STATUS_REBOOT);
while (clk_get_rate(ddr.clk) != ddr.reboot_rate && --timeout) {
msleep(10);
}
if (!timeout) {
pr_err("failed to set ddr clk from %luMHz to %luMHz when shutdown/reboot\n", clk_get_rate(ddr.clk) / MHZ, ddr.reboot_rate / MHZ);
}
return NOTIFY_OK;
}
static struct notifier_block ddrfreq_reboot_notifier = {
.notifier_call = ddrfreq_reboot_notifier_event,
};
static int ddr_scale_rate_for_dvfs(struct clk *clk, unsigned long rate, dvfs_set_rate_callback set_rate)
{
ddr_set_rate(rate/(1000*1000));
@@ -328,9 +350,10 @@ static int ddrfreq_init(void)
pr_err("failed to get ddr clk, error %d\n", ret);
return ret;
}
dvfs_clk_register_set_rate_callback(ddr.clk, ddr_scale_rate_for_dvfs);
dvfs_clk_register_set_rate_callback(ddr.clk, ddr_scale_rate_for_dvfs);
ddr.normal_rate = clk_get_rate(ddr.clk);
ddr.reboot_rate = ddr.normal_rate;
table = dvfs_get_freq_volt_table(ddr.clk);
if (!table) {
@@ -416,9 +439,11 @@ static int ddrfreq_late_init(void)
kthread_bind(ddr.task, 0);
wake_up_process(ddr.task);
pr_info("verion 2.1\n");
dprintk(DEBUG_DDR, "normal %luMHz video %luMHz idle %luMHz suspend %luMHz\n",
ddr.normal_rate / MHZ, ddr.video_rate / MHZ, ddr.idle_rate / MHZ, ddr.suspend_rate / MHZ);
register_reboot_notifier(&ddrfreq_reboot_notifier);
pr_info("verion 2.2\n");
dprintk(DEBUG_DDR, "normal %luMHz video %luMHz idle %luMHz suspend %luMHz reboot %luMHz\n",
ddr.normal_rate / MHZ, ddr.video_rate / MHZ, ddr.idle_rate / MHZ, ddr.suspend_rate / MHZ, ddr.reboot_rate / MHZ);
return 0;