openwrt-xburst/target/linux/s3c24xx/patches-2.6.24/1195-fix-pcf50633-kill-white-splash-of-death-on-suspend.p.patch

From 358429b39b6801f4856e7c80d2c58ac7be4bd0bc Mon Sep 17 00:00:00 2001
From: Andy Green <andy@openmoko.com>
Date: Wed, 2 Jul 2008 22:41:14 +0100
Subject: [PATCH] fix-pcf50633-kill-white-splash-of-death-on-suspend.patch

mach-gta02 meddles with the regulator platform struct after
it is defined, leading to LCM power getting lost in suspend
despite I set it to be left up.  Fixing this finally removes
the incredibly stubborn white LCM on suspend "flash".

This is also going to be implicated in Sean McNeil's
experience of monochromatic LCM after resume, which was
previously attacked by resetting and re-initing the LCM
from scratch.

In addition, I realized that we take down core_1v3 in
pcf50633 suspend action, this is happening near the
start of suspend, so we are in a meta-race to finish
suspend in a controlled way before the caps on core_1v3
run out (I only saw 23.3uF total).  If it's true, this
is where the weirdo sensitivity to timing during
suspend is coming from.

Therefore in this patch we also remove sleeps and
dev_info() etc (which have to flush on serial console)
from the pc50633 isr workqueue if we are in pcf50633
driver suspend state 1, ie, suspending... because we
don't have time for it.

Signed-off-by: Andy Green <andy@openmoko.com>
---
 arch/arm/mach-s3c2440/mach-gta02.c |   43 ++++++++++++++++++++++++++----------
 drivers/i2c/chips/pcf50633.c       |   29 ++++++++++++-----------
 drivers/mfd/glamo/glamo-core.c     |    2 +
 drivers/video/display/jbt6k74.c    |    1 +
 4 files changed, 49 insertions(+), 26 deletions(-)

diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
index 654dc8f..0bacafa 100644
--- a/arch/arm/mach-s3c2440/mach-gta02.c
+++ b/arch/arm/mach-s3c2440/mach-gta02.c
@@ -485,6 +485,9 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
 		[1] = PCF50633_INT2_ONKEYF,
 		[2] = PCF50633_INT3_ONKEY1S
 	},
+	/* warning: these get rewritten during machine init below
+	 * depending on pcb variant
+	 */
 	.rails	= {
 		[PCF50633_REGULATOR_AUTO] = {
 			.name		= "io_3v3",
@@ -496,6 +499,12 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
 		},
 		[PCF50633_REGULATOR_DOWN1] = {
 			.name		= "core_1v3",
+			/* Wow, when we are going into suspend, after pcf50633
+			 * runs its suspend (which happens real early since it
+			 * is an i2c device) we are running out of the 22uF cap
+			 * on core_1v3 rail !!!!
+			 */
+			.flags		= PMU_VRAIL_F_SUSPEND_ON,
 			.voltage	= {
 				.init	= 1300,
 				.max	= 1600,
@@ -503,6 +512,7 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
 		},
 		[PCF50633_REGULATOR_DOWN2] = {
 			.name		= "core_1v8",
+			.flags		= PMU_VRAIL_F_SUSPEND_ON,
 			.voltage	= {
 				.init	= 1800,
 				.max	= 1800,
@@ -516,8 +526,7 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
 			},
 		},
 		[PCF50633_REGULATOR_LDO1] = {
-			.name		= "stby_1v3",
-			.flags		= PMU_VRAIL_F_SUSPEND_ON,
+			.name		= "gsensor_3v3",
 			.voltage	= {
 				.init	= 1300,
 				.max	= 1330,
@@ -531,7 +540,7 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
 			},
 		},
 		[PCF50633_REGULATOR_LDO3] = {
-			.name		= "lcm_3v",
+			.name		= "unused3",
 			.voltage	= {
 				.init	= 3000,
 				.max	= 3000,
@@ -545,20 +554,28 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
 			},
 		},
 		[PCF50633_REGULATOR_LDO5] = {
-			.name		= "gl_1v5",
+			.name		= "rf3v",
 			.voltage	= {
 				.init	= 1500,
 				.max	= 1500,
 			},
 		},
 		[PCF50633_REGULATOR_LDO6] = {
-			.name		= "user1",
+			.name		= "lcm_3v",
 			.flags = PMU_VRAIL_F_SUSPEND_ON,
 			.voltage	= {
 				.init	= 0,
 				.max	= 3300,
 			},
 		},
+		[PCF50633_REGULATOR_MEMLDO] = {
+			.name		= "memldo",
+			.flags = PMU_VRAIL_F_SUSPEND_ON,
+			.voltage	= {
+				.init	= 1800,
+				.max	= 1800,
+			},
+		},
 	},
 	.defer_resume_backlight = 1,
 };
@@ -611,13 +628,15 @@ static void mangle_pmu_pdata_by_system_rev(void)
 								.max = 3000,
 							}
 						});
-		gta02_pcf_pdata.rails[PCF50633_REGULATOR_LDO6] = ((struct pmu_voltage_rail) {
-							.name = "lcm_3v",
-							.voltage = {
-								.init = 3000,
-								.max = 3000,
-							}
-						});
+		gta02_pcf_pdata.rails[PCF50633_REGULATOR_LDO6] =
+					((struct pmu_voltage_rail) {
+						.name = "lcm_3v",
+						.flags = PMU_VRAIL_F_SUSPEND_ON,
+						.voltage = {
+							.init = 3000,
+							.max = 3000,
+						}
+					});
 		break;
 	default:
 		break;
diff --git a/drivers/i2c/chips/pcf50633.c b/drivers/i2c/chips/pcf50633.c
index 2f144bc..2e5981d 100644
--- a/drivers/i2c/chips/pcf50633.c
+++ b/drivers/i2c/chips/pcf50633.c
@@ -750,9 +750,6 @@ static void pcf50633_work(struct work_struct *work)
 	mutex_lock(&pcf->working_lock);
 	pcf->working = 1;
 
-	dev_info(&pcf->client.dev, "pcf50633_work called with suspended = %d\n",
-				   pcf->have_been_suspended);
-
 	/*
 	 * If we are inside suspend -> resume completion time we don't attempt
 	 * service until we have fully resumed.  Although we could talk to the
@@ -763,11 +760,8 @@ static void pcf50633_work(struct work_struct *work)
 	 * completed.
 	 */
 
-	if (pcf->have_been_suspended && (pcf->have_been_suspended < 3)) {
-		dev_info(&pcf->client.dev, "rescheduling,  suspended = %d\n",
-					   pcf->have_been_suspended);
+	if (pcf->have_been_suspended && (pcf->have_been_suspended < 3))
 		goto reschedule;
-	}
 
 	/*
 	 * datasheet says we have to read the five IRQ
@@ -1158,9 +1152,13 @@ static void pcf50633_work(struct work_struct *work)
 
 reschedule:
 	/* don't spew, delaying whatever else is happening */
-	msleep(100);
-
-	dev_info(&pcf->client.dev, "rescheduling interrupt service\n");
+	/* EXCEPTION: if we are in the middle of suspending, we don't have
+	 * time to hang around since we may be turned off core 1V3 already
+	 */
+	if (pcf->have_been_suspended != 1) {
+		msleep(50);
+		dev_info(&pcf->client.dev, "rescheduling interrupt service\n");
+	}
 	if (!schedule_work(&pcf->work))
 		dev_err(&pcf->client.dev, "int service reschedule failed\n");
 
@@ -2340,7 +2338,7 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 					    PCF50633_REG_AUTOOUT,
 					    sizeof(pcf->standby_regs.misc),
 					    &pcf->standby_regs.misc[0]);
-	if (ret != 18)
+	if (ret != sizeof(pcf->standby_regs.misc))
 		dev_err(dev, "Failed to save misc levels and enables :-(\n");
 
 	/* regulator voltages and enable states */
@@ -2348,7 +2346,7 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 					    PCF50633_REG_LDO1OUT,
 					    sizeof(pcf->standby_regs.ldo),
 					    &pcf->standby_regs.ldo[0]);
-	if (ret != 14)
+	if (ret != sizeof(pcf->standby_regs.ldo))
 		dev_err(dev, "Failed to save LDO levels and enables :-(\n");
 
 	/* switch off power supplies that are not needed during suspend */
@@ -2356,8 +2354,6 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 		if ((pcf->pdata->rails[i].flags & PMU_VRAIL_F_SUSPEND_ON))
 			continue;
 
-		dev_dbg(dev, "disabling regulator %u\n", i);
-
 		/* we can save ourselves the read part of a read-modify-write
 		 * here because we captured all these already
 		 */
@@ -2366,6 +2362,11 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 		else
 			tmp = pcf->standby_regs.ldo[(i - 4) * 2 + 1];
 
+		dev_info(dev, "disabling reg %s by setting ENA %d to 0x%02X\n",
+			      pcf->pdata->rails[i].name,
+			      regulator_registers[i] + 1, tmp & 0xfe);
+
+		/* associated enable is always +1 from OUT reg */
 		__reg_write(pcf, regulator_registers[i] + 1, tmp & 0xfe);
 	}
 
diff --git a/drivers/mfd/glamo/glamo-core.c b/drivers/mfd/glamo/glamo-core.c
index 2a02f9c..2412b7d 100644
--- a/drivers/mfd/glamo/glamo-core.c
+++ b/drivers/mfd/glamo/glamo-core.c
@@ -848,6 +848,7 @@ static void glamo_power(struct glamo_core *glamo,
 				 ARRAY_SIZE(glamo_resume_script), 0);
 
 		break;
+
 	case GLAMO_POWER_STANDBY:
 		/* enable memory self-refresh */
 		__reg_set_bit_mask(glamo, GLAMO_REG_MEM_DRAM1,
@@ -859,6 +860,7 @@ static void glamo_power(struct glamo_core *glamo,
 		__reg_set_bit_mask(glamo, GLAMO_REG_PLL_GEN3, 0x2000, 0xffff);
 		__reg_set_bit_mask(glamo, GLAMO_REG_DFT_GEN5, 0x0001, 0xffff);
 		break;
+
 	case GLAMO_POWER_SUSPEND:
 		__reg_set_bit_mask(glamo, GLAMO_REG_MEM_DRAM2,
 				   GLAMO_MEM_DRAM2_DEEP_PWRDOWN, 0xffff);
diff --git a/drivers/video/display/jbt6k74.c b/drivers/video/display/jbt6k74.c
index 6fa1fe7..b406298 100644
--- a/drivers/video/display/jbt6k74.c
+++ b/drivers/video/display/jbt6k74.c
@@ -634,6 +634,7 @@ static int jbt_suspend(struct spi_device *spi, pm_message_t state)
 
 	/* Save mode for resume */
 	jbt->last_state = jbt->state;
+
 	jbt6k74_enter_state(jbt, JBT_STATE_DEEP_STANDBY);
 
 	jbt->have_resumed = 0;
-- 
1.5.6.5