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openwrt/target/linux/s3c24xx/patches-2.6.24/1179-fix-pcf50633-suspend-r...

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From 83636af17dab41d313411543c57984b5834cfcf2 Mon Sep 17 00:00:00 2001
From: Andy Green <andy@openmoko.com>
Date: Wed, 2 Jul 2008 22:39:10 +0100
Subject: [PATCH] fix-pcf50633-suspend-resume-onehit-i2c-other-meddling.patch
- speed up suspend and resume by using one hit i2c bulk transactions
- don't bother storing int mask set on suspend, the default one is
what we use anyway
- put stack_trace() on pcf50633 low level access that fire if we
try to touch them before we resumed
- cosmetic source cleanup
- reduces resume time for pcf50633 from 450ms to 255ms
Signed-off-by: Andy Green <andy@openmoko.com>
---
arch/arm/mach-s3c2440/mach-gta02.c | 21 ++-------
drivers/i2c/chips/pcf50633.c | 83 +++++++++++++++++++----------------
2 files changed, 49 insertions(+), 55 deletions(-)
diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
index 9ba1036..22de181 100644
--- a/arch/arm/mach-s3c2440/mach-gta02.c
+++ b/arch/arm/mach-s3c2440/mach-gta02.c
@@ -477,24 +477,11 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
.r_fix_batt_par = 10000,
.r_sense_milli = 220,
.resumers = {
- [0] = /* PCF50633_INT1_ADPINS | */
- /* PCF50633_INT1_ADPREM | */
- PCF50633_INT1_USBINS |
- PCF50633_INT1_USBREM |
- PCF50633_INT1_ALARM,
+ [0] = PCF50633_INT1_USBINS |
+ PCF50633_INT1_USBREM |
+ PCF50633_INT1_ALARM,
[1] = PCF50633_INT2_ONKEYF,
- [2] = /* PCF50633_INT3_BATFULL | */
- /* PCF50633_INT3_CHGHALT | */
- /* PCF50633_INT3_THLIMON | */
- /* PCF50633_INT3_THLIMOFF | */
- /* PCF50633_INT3_USBLIMON | */
- /* PCF50633_INT3_USBLIMOFF | */
- PCF50633_INT3_ONKEY1S ,
- [3] = 0 /* |
- PCF50633_INT4_LOWSYS | */
- /* PCF50633_INT4_LOWBAT | */
- /* PCF50633_INT4_HIGHTMP */,
- [4] = 0
+ [2] = PCF50633_INT3_ONKEY1S
},
.rails = {
[PCF50633_REGULATOR_AUTO] = {
diff --git a/drivers/i2c/chips/pcf50633.c b/drivers/i2c/chips/pcf50633.c
index aabf412..8cb6156 100644
--- a/drivers/i2c/chips/pcf50633.c
+++ b/drivers/i2c/chips/pcf50633.c
@@ -163,10 +163,7 @@ struct pcf50633_data {
u_int8_t down2out, down2ena;
u_int8_t memldoout, memldoena;
u_int8_t ledout, ledena, leddim;
- struct {
- u_int8_t out;
- u_int8_t ena;
- } ldo[__NUM_PCF50633_REGS];
+ u_int8_t ldo[__NUM_PCF50633_REGS][2];
} standby_regs;
struct resume_dependency resume_dependency;
@@ -187,6 +184,10 @@ static struct platform_device *pcf50633_pdev;
static int __reg_write(struct pcf50633_data *pcf, u_int8_t reg, u_int8_t val)
{
+ if (pcf->have_been_suspended == 1) {
+ dev_err(&pcf->client.dev, "__reg_write while suspended\n");
+ dump_stack();
+ }
return i2c_smbus_write_byte_data(&pcf->client, reg, val);
}
@@ -205,6 +206,10 @@ static int32_t __reg_read(struct pcf50633_data *pcf, u_int8_t reg)
{
int32_t ret;
+ if (pcf->have_been_suspended == 1) {
+ dev_err(&pcf->client.dev, "__reg_read while suspended\n");
+ dump_stack();
+ }
ret = i2c_smbus_read_byte_data(&pcf->client, reg);
return ret;
@@ -2165,6 +2170,13 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
struct i2c_client *client = to_i2c_client(dev);
struct pcf50633_data *pcf = i2c_get_clientdata(client);
int i;
+ int ret;
+ u_int8_t tmp;
+
+ /* we suspend once (!) as late as possible in the suspend sequencing */
+
+ if ((state.event != PM_EVENT_SUSPEND) || (pcf->have_been_suspended))
+ return 0;
/* The general idea is to power down all unused power supplies,
* and then mask all PCF50606 interrup sources but EXTONR, ONKEYF
@@ -2186,25 +2198,25 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
pcf->standby_regs.ledout = __reg_read(pcf, PCF50633_REG_LEDOUT);
pcf->standby_regs.ledena = __reg_read(pcf, PCF50633_REG_LEDENA);
pcf->standby_regs.leddim = __reg_read(pcf, PCF50633_REG_LEDDIM);
- /* FIXME: one big read? */
- for (i = 0; i < 7; i++) {
- u_int8_t reg_out = PCF50633_REG_LDO1OUT + 2*i;
- pcf->standby_regs.ldo[i].out = __reg_read(pcf, reg_out);
- pcf->standby_regs.ldo[i].ena = __reg_read(pcf, reg_out+1);
- }
+
+ /* regulator voltages and enable states */
+ ret = i2c_smbus_read_i2c_block_data(&pcf->client,
+ PCF50633_REG_LDO1OUT, 14,
+ &pcf->standby_regs.ldo[0][0]);
+ if (ret != 14)
+ dev_err(dev, "Failed to save LDO levels and enables :-(\n");
/* switch off power supplies that are not needed during suspend */
for (i = 0; i < __NUM_PCF50633_REGULATORS; i++) {
- if (!(pcf->pdata->rails[i].flags & PMU_VRAIL_F_SUSPEND_ON)) {
- u_int8_t tmp;
-
- DEBUGP("disabling pcf50633 regulator %u\n", i);
- /* we cannot use pcf50633_onoff_set() because we're
- * already under the mutex */
- tmp = __reg_read(pcf, regulator_registers[i]+1);
- tmp &= 0xfe;
- __reg_write(pcf, regulator_registers[i]+1, tmp);
- }
+ if ((pcf->pdata->rails[i].flags & PMU_VRAIL_F_SUSPEND_ON))
+ continue;
+
+ dev_dbg(dev, "disabling regulator %u\n", i);
+ /* we cannot use pcf50633_onoff_set() because we're
+ * already under the mutex */
+ tmp = __reg_read(pcf, regulator_registers[i]+1);
+ tmp &= 0xfe;
+ __reg_write(pcf, regulator_registers[i]+1, tmp);
}
/* turn off the backlight */
@@ -2212,11 +2224,9 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
__reg_write(pcf, PCF50633_REG_LEDOUT, 2);
__reg_write(pcf, PCF50633_REG_LEDENA, 0x00);
- pcf->standby_regs.int1m = __reg_read(pcf, PCF50633_REG_INT1M);
- pcf->standby_regs.int2m = __reg_read(pcf, PCF50633_REG_INT2M);
- pcf->standby_regs.int3m = __reg_read(pcf, PCF50633_REG_INT3M);
- pcf->standby_regs.int4m = __reg_read(pcf, PCF50633_REG_INT4M);
- pcf->standby_regs.int5m = __reg_read(pcf, PCF50633_REG_INT5M);
+ /* set interrupt masks so only those sources we want to wake
+ * us are able to
+ */
__reg_write(pcf, PCF50633_REG_INT1M, ~pcf->pdata->resumers[0]);
__reg_write(pcf, PCF50633_REG_INT2M, ~pcf->pdata->resumers[1]);
__reg_write(pcf, PCF50633_REG_INT3M, ~pcf->pdata->resumers[2]);
@@ -2250,16 +2260,13 @@ static int pcf50633_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct pcf50633_data *pcf = i2c_get_clientdata(client);
- int i;
+ int ret;
mutex_lock(&pcf->lock);
- /* Resume all saved registers that don't "survive" standby state */
- __reg_write(pcf, PCF50633_REG_INT1M, pcf->standby_regs.int1m);
- __reg_write(pcf, PCF50633_REG_INT2M, pcf->standby_regs.int2m);
- __reg_write(pcf, PCF50633_REG_INT3M, pcf->standby_regs.int3m);
- __reg_write(pcf, PCF50633_REG_INT4M, pcf->standby_regs.int4m);
- __reg_write(pcf, PCF50633_REG_INT5M, pcf->standby_regs.int5m);
+ pcf->have_been_suspended = 2; /* resuming */
+
+ /* these guys get reset while pcf50633 is suspend state, refresh */
__reg_write(pcf, PCF50633_REG_OOCTIM2, pcf->standby_regs.ooctim2);
__reg_write(pcf, PCF50633_REG_AUTOOUT, pcf->standby_regs.autoout);
@@ -2275,12 +2282,12 @@ static int pcf50633_resume(struct device *dev)
if (!pcf->pdata->defer_resume_backlight)
pcf50633_backlight_resume(pcf);
- /* FIXME: one big read? */
- for (i = 0; i < 7; i++) {
- u_int8_t reg_out = PCF50633_REG_LDO1OUT + 2*i;
- __reg_write(pcf, reg_out, pcf->standby_regs.ldo[i].out);
- __reg_write(pcf, reg_out+1, pcf->standby_regs.ldo[i].ena);
- }
+ /* regulator voltages and enable states */
+ ret = i2c_smbus_write_i2c_block_data(&pcf->client,
+ PCF50633_REG_LDO1OUT, 14,
+ &pcf->standby_regs.ldo[0][0]);
+ if (ret)
+ dev_err(dev, "Failed to restore LDOs :-( %d\n", ret);
mutex_unlock(&pcf->lock);
--
1.5.6.5
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