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

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