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openwrt/target/linux/s3c24xx/patches-2.6.24/1187-fix-pcf50633-use-i2c-bulk-autoincrement.patch.patch

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From 8a2d04c222684e3278dd28d11f57a05fe0865183 Mon Sep 17 00:00:00 2001
From: Andy Green <andy@openmoko.com>
Date: Wed, 2 Jul 2008 22:40:12 +0100
Subject: [PATCH] fix-pcf50633-use-i2c-bulk-autoincrement.patch
Simplify and speed up bulk sequential I2C actions in pcf50633
the time savings are pretty considerable and so is the simplification
Signed-off-by: Andy Green <andy@openmoko.com>
---
drivers/i2c/chips/pcf50633.c | 117 +++++++++++++++++++++++++-----------------
1 files changed, 70 insertions(+), 47 deletions(-)
diff --git a/drivers/i2c/chips/pcf50633.c b/drivers/i2c/chips/pcf50633.c
index 1f88c32..96857a3 100644
--- a/drivers/i2c/chips/pcf50633.c
+++ b/drivers/i2c/chips/pcf50633.c
@@ -156,14 +156,14 @@ struct pcf50633_data {
#ifdef CONFIG_PM
struct {
- u_int8_t int1m, int2m, int3m, int4m, int5m;
u_int8_t ooctim2;
- u_int8_t autoout, autoena, automxc;
- u_int8_t down1out, down1mxc;
- u_int8_t down2out, down2ena;
- u_int8_t memldoout, memldoena;
- u_int8_t ledout, ledena, leddim;
- u_int8_t ldo[__NUM_PCF50633_REGS][2];
+ /* enables are always [1] below
+ * I2C has limit of 32 sequential regs, so done in two lumps
+ * because it covers 33 register extent otherwise
+ */
+ u_int8_t misc[PCF50633_REG_LEDDIM - PCF50633_REG_AUTOOUT + 1];
+ /* skip 1 reserved reg here */
+ u_int8_t ldo[PCF50633_REG_HCLDOENA - PCF50633_REG_LDO1OUT + 1];
} standby_regs;
struct resume_dependency resume_dependency;
@@ -1737,6 +1737,8 @@ static int pcf50633bl_set_intensity(struct backlight_device *bd)
int old_intensity = reg_read(pcf, PCF50633_REG_LEDOUT);
int ret;
+ dev_info(&pcf->client.dev, "pcf50633bl_set_intensity\n");
+
if (!(reg_read(pcf, PCF50633_REG_LEDENA) & 1))
old_intensity = 0;
@@ -2221,6 +2223,9 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
int i;
int ret;
u_int8_t tmp;
+ u_int8_t res[5];
+
+ dev_err(dev, "pcf50633_suspend\n");
/* we suspend once (!) as late as possible in the suspend sequencing */
@@ -2228,30 +2233,26 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
return 0;
/* The general idea is to power down all unused power supplies,
- * and then mask all PCF50606 interrup sources but EXTONR, ONKEYF
+ * and then mask all PCF50633 interrupt sources but EXTONR, ONKEYF
* and ALARM */
mutex_lock(&pcf->lock);
/* Save all registers that don't "survive" standby state */
pcf->standby_regs.ooctim2 = __reg_read(pcf, PCF50633_REG_OOCTIM2);
- pcf->standby_regs.autoout = __reg_read(pcf, PCF50633_REG_AUTOOUT);
- pcf->standby_regs.autoena = __reg_read(pcf, PCF50633_REG_AUTOENA);
- pcf->standby_regs.automxc = __reg_read(pcf, PCF50633_REG_AUTOMXC);
- pcf->standby_regs.down1out = __reg_read(pcf, PCF50633_REG_DOWN1OUT);
- pcf->standby_regs.down1mxc = __reg_read(pcf, PCF50633_REG_DOWN1MXC);
- pcf->standby_regs.down2out = __reg_read(pcf, PCF50633_REG_DOWN2OUT);
- pcf->standby_regs.down2ena = __reg_read(pcf, PCF50633_REG_DOWN2ENA);
- pcf->standby_regs.memldoout = __reg_read(pcf, PCF50633_REG_MEMLDOOUT);
- pcf->standby_regs.memldoena = __reg_read(pcf, PCF50633_REG_MEMLDOENA);
- 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);
+
+ ret = i2c_smbus_read_i2c_block_data(&pcf->client,
+ PCF50633_REG_AUTOOUT,
+ sizeof(pcf->standby_regs.misc),
+ &pcf->standby_regs.misc[0]);
+ if (ret != 18)
+ dev_err(dev, "Failed to save misc levels and enables :-(\n");
/* regulator voltages and enable states */
ret = i2c_smbus_read_i2c_block_data(&pcf->client,
- PCF50633_REG_LDO1OUT, 14,
- &pcf->standby_regs.ldo[0][0]);
+ PCF50633_REG_LDO1OUT,
+ sizeof(pcf->standby_regs.ldo),
+ &pcf->standby_regs.ldo[0]);
if (ret != 14)
dev_err(dev, "Failed to save LDO levels and enables :-(\n");
@@ -2261,11 +2262,16 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
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);
+
+ /* we can save ourselves the read part of a read-modify-write
+ * here because we captured all these already
+ */
+ if (i < 4)
+ tmp = pcf->standby_regs.misc[i * 4 + 1];
+ else
+ tmp = pcf->standby_regs.ldo[(i - 4) * 2 + 1];
+
+ __reg_write(pcf, regulator_registers[i] + 1, tmp & 0xfe);
}
/* turn off the backlight */
@@ -2276,11 +2282,14 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
/* 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]);
- __reg_write(pcf, PCF50633_REG_INT4M, ~pcf->pdata->resumers[3]);
- __reg_write(pcf, PCF50633_REG_INT5M, ~pcf->pdata->resumers[4]);
+ for (i = 0; i < 5; i++)
+ res[i] = ~pcf->pdata->resumers[i];
+
+ ret = i2c_smbus_write_i2c_block_data(&pcf->client,
+ PCF50633_REG_INT1M,
+ 5, &res[0]);
+ if (ret)
+ dev_err(dev, "Failed to set wake masks :-( %d\n", ret);
pcf->have_been_suspended = 1;
@@ -2312,9 +2321,12 @@ EXPORT_SYMBOL_GPL(pcf50633_ready);
void pcf50633_backlight_resume(struct pcf50633_data *pcf)
{
/* we force the backlight on in fact */
- __reg_write(pcf, PCF50633_REG_LEDOUT, pcf->standby_regs.ledout);
- __reg_write(pcf, PCF50633_REG_LEDENA, pcf->standby_regs.ledena | 0x01);
- __reg_write(pcf, PCF50633_REG_LEDDIM, pcf->standby_regs.leddim);
+ __reg_write(pcf, PCF50633_REG_LEDOUT, pcf->standby_regs.misc[
+ PCF50633_REG_LEDOUT - PCF50633_REG_AUTOOUT]);
+ __reg_write(pcf, PCF50633_REG_LEDENA, pcf->standby_regs.misc[
+ PCF50633_REG_LEDENA - PCF50633_REG_AUTOOUT] | 1);
+ __reg_write(pcf, PCF50633_REG_LEDDIM, pcf->standby_regs.misc[
+ PCF50633_REG_LEDDIM - PCF50633_REG_AUTOOUT]);
}
EXPORT_SYMBOL_GPL(pcf50633_backlight_resume);
@@ -2324,7 +2336,10 @@ static int pcf50633_resume(struct device *dev)
struct i2c_client *client = to_i2c_client(dev);
struct pcf50633_data *pcf = i2c_get_clientdata(client);
int ret;
+ u8 res[5];
+ dev_info(dev, "pcf50633_resume suspended on entry = %d\n",
+ pcf->have_been_suspended);
mutex_lock(&pcf->lock);
pcf->have_been_suspended = 2; /* resuming */
@@ -2332,14 +2347,14 @@ static int pcf50633_resume(struct device *dev)
/* 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);
- __reg_write(pcf, PCF50633_REG_AUTOMXC, pcf->standby_regs.automxc);
- __reg_write(pcf, PCF50633_REG_DOWN1OUT, pcf->standby_regs.down1out);
- __reg_write(pcf, PCF50633_REG_DOWN1MXC, pcf->standby_regs.down1mxc);
- __reg_write(pcf, PCF50633_REG_DOWN2OUT, pcf->standby_regs.down2out);
- __reg_write(pcf, PCF50633_REG_DOWN2ENA, pcf->standby_regs.down2ena);
- __reg_write(pcf, PCF50633_REG_MEMLDOOUT, pcf->standby_regs.memldoout);
- __reg_write(pcf, PCF50633_REG_MEMLDOENA, pcf->standby_regs.memldoena);
+
+ /* regulator voltages and enable states */
+ ret = i2c_smbus_write_i2c_block_data(&pcf->client,
+ PCF50633_REG_AUTOOUT,
+ sizeof(pcf->standby_regs.misc) - 4,
+ &pcf->standby_regs.misc[0]);
+ if (ret)
+ dev_err(dev, "Failed to restore misc :-( %d\n", ret);
/* platform can choose to defer backlight bringup */
if (!pcf->pdata->defer_resume_backlight)
@@ -2347,14 +2362,22 @@ static int pcf50633_resume(struct device *dev)
/* regulator voltages and enable states */
ret = i2c_smbus_write_i2c_block_data(&pcf->client,
- PCF50633_REG_LDO1OUT, 14,
- &pcf->standby_regs.ldo[0][0]);
+ PCF50633_REG_LDO1OUT,
+ sizeof(pcf->standby_regs.ldo),
+ &pcf->standby_regs.ldo[0]);
if (ret)
dev_err(dev, "Failed to restore LDOs :-( %d\n", ret);
- mutex_unlock(&pcf->lock);
+ memset(res, 0, sizeof(res));
+ ret = i2c_smbus_write_i2c_block_data(&pcf->client,
+ PCF50633_REG_INT1M,
+ 5, &res[0]);
+ if (ret)
+ dev_err(dev, "Failed to set int masks :-( %d\n", ret);
- pcf50633_irq(pcf->irq, pcf);
+ pcf->have_been_suspended = 3; /* resume completed */
+
+ mutex_unlock(&pcf->lock);
callback_all_resume_dependencies(&pcf->resume_dependency);
--
1.5.6.5
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