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openwrt/target/linux/s3c24xx/patches-2.6.24/1327-jbt6k74_no_deep_sleep....

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From 62b3330f97b940c715a8931abc7161c99362abaa Mon Sep 17 00:00:00 2001
From: Nicolas Dufresne <nicolas.dufresne@gmail.com>
Date: Thu, 4 Dec 2008 17:49:02 +0000
Subject: [PATCH] jbt6k74_no_deep_sleep.patch
This patch from
https://docs.openmoko.org/trac/ticket/1841
defeats deep sleep on the LCM ASIC and is reported to stop the WSOD
behaviour on LCMs that exhibit it.
---
drivers/video/display/jbt6k74.c | 114 ++++++++++++++++++++++-----------------
1 files changed, 65 insertions(+), 49 deletions(-)
diff --git a/drivers/video/display/jbt6k74.c b/drivers/video/display/jbt6k74.c
index 9570543..0635823 100644
--- a/drivers/video/display/jbt6k74.c
+++ b/drivers/video/display/jbt6k74.c
@@ -252,22 +252,36 @@ static int jbt_init_regs(struct jbt_info *jbt, int qvga)
return rc ? -EIO : 0;
}
-static int standby_to_sleep(struct jbt_info *jbt)
+int jbt6k74_display_onoff(struct jbt_info *jbt, int on)
{
- int rc;
-
- /* three times command zero */
- rc = jbt_reg_write_nodata(jbt, 0x00);
- mdelay(1);
- rc |= jbt_reg_write_nodata(jbt, 0x00);
- mdelay(1);
- rc |= jbt_reg_write_nodata(jbt, 0x00);
- mdelay(1);
-
- /* deep standby out */
- rc |= jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x17);
+ if (on)
+ return jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_ON);
+ else
+ return jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_OFF);
+}
+EXPORT_SYMBOL_GPL(jbt6k74_display_onoff);
- return rc ? -EIO : 0;
+static int standby_to_sleep(struct jbt_info *jbt)
+{
+ static int once = 0;
+ if (!once++) {
+ int rc;
+
+ /* three times command zero */
+ rc = jbt_reg_write_nodata(jbt, 0x00);
+ mdelay(1);
+ rc |= jbt_reg_write_nodata(jbt, 0x00);
+ mdelay(1);
+ rc |= jbt_reg_write_nodata(jbt, 0x00);
+ mdelay(1);
+
+ /* deep standby out */
+ rc |= jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x17);
+
+ return rc ? -EIO : 0;
+ }
+ else
+ return 0;
}
static int sleep_to_normal(struct jbt_info *jbt)
@@ -292,6 +306,9 @@ static int sleep_to_normal(struct jbt_info *jbt)
/* initialize register set */
rc |= jbt_init_regs(jbt, 0);
+ /* Turn on display */
+ rc |= jbt6k74_display_onoff(jbt, 1);
+
return rc ? -EIO : 0;
}
@@ -317,6 +334,9 @@ static int sleep_to_qvga_normal(struct jbt_info *jbt)
/* initialize register set for qvga*/
rc |= jbt_init_regs(jbt, 1);
+ /* Turn on display */
+ rc |= jbt6k74_display_onoff(jbt, 1);
+
return rc ? -EIO : 0;
}
@@ -324,7 +344,8 @@ static int normal_to_sleep(struct jbt_info *jbt)
{
int rc;
- rc = jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_OFF);
+ rc = jbt6k74_display_onoff(jbt, 0);
+ rc |= jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_OFF);
rc |= jbt_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0x8002);
rc |= jbt_reg_write_nodata(jbt, JBT_REG_SLEEP_IN);
@@ -333,7 +354,11 @@ static int normal_to_sleep(struct jbt_info *jbt)
static int sleep_to_standby(struct jbt_info *jbt)
{
+#if 0
return jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x00);
+#else
+ return 0;
+#endif
}
/* frontend function */
@@ -436,6 +461,7 @@ int jbt6k74_enter_state(struct jbt_info *jbt, enum jbt_state new_state)
}
break;
}
+
if (rc == 0)
jbt->state = new_state;
@@ -443,15 +469,6 @@ int jbt6k74_enter_state(struct jbt_info *jbt, enum jbt_state new_state)
}
EXPORT_SYMBOL_GPL(jbt6k74_enter_state);
-int jbt6k74_display_onoff(struct jbt_info *jbt, int on)
-{
- if (on)
- return jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_ON);
- else
- return jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_OFF);
-}
-EXPORT_SYMBOL_GPL(jbt6k74_display_onoff);
-
static ssize_t state_read(struct device *dev, struct device_attribute *attr,
char *buf)
{
@@ -475,17 +492,6 @@ static ssize_t state_write(struct device *dev, struct device_attribute *attr,
rc = jbt6k74_enter_state(jbt, i);
if (rc)
return rc;
- switch (i) {
- case JBT_STATE_NORMAL:
- case JBT_STATE_QVGA_NORMAL:
- /* Enable display again after deep-standby */
- rc = jbt6k74_display_onoff(jbt, 1);
- if (rc)
- return rc;
- break;
- default:
- break;
- }
return count;
}
}
@@ -528,6 +534,8 @@ static ssize_t gamma_write(struct device *dev, struct device_attribute *attr,
int reg = reg_by_string(attr->attr.name);
unsigned long val = simple_strtoul(buf, NULL, 10);
+ dev_info(dev, "**** jbt6k74 writing gama %lu\n", val & 0xff);
+
jbt_reg_write(jbt, reg, val & 0xff);
return count;
@@ -567,19 +575,27 @@ static int fb_notifier_callback(struct notifier_block *self,
switch (fb_blank) {
case FB_BLANK_UNBLANK:
+ dev_info(&jbt->spi_dev->dev, "**** jbt6k74 unblank\n");
+ break;
case FB_BLANK_NORMAL:
- jbt6k74_enter_state(jbt, JBT_STATE_NORMAL);
- jbt6k74_display_onoff(jbt, 1);
+ dev_info(&jbt->spi_dev->dev, "**** jbt6k74 normal\n");
+ /*jbt6k74_enter_state(jbt, JBT_STATE_NORMAL);
+ jbt6k74_display_onoff(jbt, 1); */
break;
case FB_BLANK_VSYNC_SUSPEND:
+ dev_info(&jbt->spi_dev->dev, "**** jbt6k74 vsync suspend\n");
+ break;
case FB_BLANK_HSYNC_SUSPEND:
+ dev_info(&jbt->spi_dev->dev, "**** jbt6k74 hsync suspend\n");
/* FIXME: we disable SLEEP since it would result in
* a visible artefact (white screen) before the backlight
* is dimmed to a dark enough level */
/* jbt6k74_enter_state(jbt, JBT_STATE_SLEEP); */
+ /*jbt6k74_display_onoff(jbt, 0);*/
break;
case FB_BLANK_POWERDOWN:
- jbt6k74_enter_state(jbt, JBT_STATE_DEEP_STANDBY);
+ dev_info(&jbt->spi_dev->dev, "**** jbt6k74 powerdown\n");
+ /*jbt6k74_enter_state(jbt, JBT_STATE_DEEP_STANDBY);*/
break;
}
@@ -621,16 +637,10 @@ static int __devinit jbt_probe(struct spi_device *spi)
goto err_free_drvdata;
}
- rc = jbt6k74_display_onoff(jbt, 1);
- if (rc < 0) {
- dev_err(&spi->dev, "cannot switch display on\n");
- goto err_standby;
- }
-
rc = sysfs_create_group(&spi->dev.kobj, &jbt_attr_group);
if (rc < 0) {
dev_err(&spi->dev, "cannot create sysfs group\n");
- goto err_off;
+ goto err_standby;
}
jbt->fb_notif.notifier_call = fb_notifier_callback;
@@ -644,8 +654,6 @@ static int __devinit jbt_probe(struct spi_device *spi)
err_sysfs:
sysfs_remove_group(&spi->dev.kobj, &jbt_attr_group);
-err_off:
- jbt6k74_display_onoff(jbt, 0);
err_standby:
jbt6k74_enter_state(jbt, JBT_STATE_DEEP_STANDBY);
err_free_drvdata:
@@ -676,6 +684,8 @@ static int jbt_suspend(struct spi_device *spi, pm_message_t state)
struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
struct jbt6k74_platform_data *jbt6k74_pdata = spi->dev.platform_data;
+ dev_info(&spi->dev, "**** jbt6k74 suspend start\n");
+
/* platform can register resume dependencies here, if any */
if (jbt6k74_pdata->suspending)
(jbt6k74_pdata->suspending)(0, spi);
@@ -689,6 +699,8 @@ static int jbt_suspend(struct spi_device *spi, pm_message_t state)
/* (jbt6k74_pdata->reset)(0, 0); */
+ dev_info(&spi->dev, "**** jbt6k74 suspend end\n");
+
return 0;
}
@@ -697,6 +709,7 @@ int jbt6k74_resume(struct spi_device *spi)
struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
struct jbt6k74_platform_data *jbt6k74_pdata = spi->dev.platform_data;
+ dev_info(&spi->dev, "**** jbt6k74 resume start\n");
if (jbt6k74_pdata->all_dependencies_resumed)
if (!(jbt6k74_pdata->all_dependencies_resumed)(0))
return 0;
@@ -704,8 +717,10 @@ int jbt6k74_resume(struct spi_device *spi)
/* we can get called twice with all dependencies resumed if our core
* resume callback is last of all. Protect against doing anything twice
*/
- if (jbt->have_resumed)
+ if (jbt->have_resumed) {
+ dev_info(&spi->dev, "**** jbt6k74 already resumed\n");
return 0;
+ }
jbt->have_resumed |= 1;
@@ -717,11 +732,12 @@ int jbt6k74_resume(struct spi_device *spi)
jbt6k74_enter_state(jbt, JBT_STATE_NORMAL);
break;
}
- jbt6k74_display_onoff(jbt, 1);
if (jbt6k74_pdata->resuming)
(jbt6k74_pdata->resuming)(0);
+ dev_info(&spi->dev, "**** jbt6k74 resume end\n");
+
return 0;
}
EXPORT_SYMBOL_GPL(jbt6k74_resume);
--
1.5.6.5
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