openwrt/target/linux/s3c24xx/patches-2.6.24/1231-fix-glamo-suspend-resume-dram-and-engines.patch.patch

From e1673170182af199be7c6a2a346d8bad7e4dc532 Mon Sep 17 00:00:00 2001
From: Andy Green <andy@openmoko.com>
Date: Tue, 15 Jul 2008 09:04:00 +0100
Subject: [PATCH] fix-glamo-suspend-resume-dram-and-engines.patch

Two issues... we never took care to take down engines in suspend
and bring them back in resume.  This was part of the display
corruption that could be seen briefly on resume.  The other issue
that made the "noise" corruption was bad ordering of resume steps.

This patch simplifies (removing needless re-init) resume actions
and makes explicit the suspend and resume steps.  It also adds
code to track which engines are up and push them down in suspend
and bring them back in resume.

The result is no more corruption of display buffer in suspend, it
comes back completely clean.

Signed-off-by: Andy Green <andy@openmoko.com>
---
 drivers/mfd/glamo/glamo-core.c |  266 +++++++++++++++++++---------------------
 drivers/mfd/glamo/glamo-core.h |    2 +
 drivers/mfd/glamo/glamo-regs.h |    6 +-
 3 files changed, 135 insertions(+), 139 deletions(-)

diff --git a/drivers/mfd/glamo/glamo-core.c b/drivers/mfd/glamo/glamo-core.c
index 2412b7d..bea0387 100644
--- a/drivers/mfd/glamo/glamo-core.c
+++ b/drivers/mfd/glamo/glamo-core.c
@@ -54,6 +54,8 @@
 
 #define RESSIZE(ressource) (((ressource)->end - (ressource)->start)+1)
 
+#define GLAMO_MEM_REFRESH_COUNT 0x100
+
 static struct glamo_core *glamo_handle;
 
 static inline void __reg_write(struct glamo_core *glamo,
@@ -381,9 +383,8 @@ out_unlock:
  * 'engine' support
  ***********************************************************************/
 
-int glamo_engine_enable(struct glamo_core *glamo, enum glamo_engine engine)
+int __glamo_engine_enable(struct glamo_core *glamo, enum glamo_engine engine)
 {
-	spin_lock(&glamo->lock);
 	switch (engine) {
 	case GLAMO_ENGINE_LCD:
 		__reg_set_bit_mask(glamo, GLAMO_REG_CLOCK_LCD,
@@ -432,27 +433,59 @@ int glamo_engine_enable(struct glamo_core *glamo, enum glamo_engine engine)
 	default:
 		break;
 	}
-	spin_unlock(&glamo->lock);
+
+	glamo->engine_enabled_bitfield |= 1 << engine;
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(glamo_engine_enable);
 
-int glamo_engine_disable(struct glamo_core *glamo, enum glamo_engine engine)
+int glamo_engine_enable(struct glamo_core *glamo, enum glamo_engine engine)
 {
+	int ret;
+
 	spin_lock(&glamo->lock);
+
+	ret = __glamo_engine_enable(glamo, engine);
+
+	spin_unlock(&glamo->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(glamo_engine_enable);
+
+int __glamo_engine_disable(struct glamo_core *glamo, enum glamo_engine engine)
+{
 	switch (engine) {
+	case GLAMO_ENGINE_LCD:
+		/* remove pixel clock to LCM */
+		__reg_set_bit_mask(glamo, GLAMO_REG_CLOCK_LCD,
+			    GLAMO_CLOCK_LCD_EN_DCLK, 0);
+		__reg_set_bit_mask(glamo, GLAMO_REG_CLOCK_LCD,
+			    GLAMO_CLOCK_LCD_EN_DHCLK |
+			    GLAMO_CLOCK_LCD_EN_DMCLK, 0);
+		/* kill memory clock */
+		__reg_set_bit_mask(glamo, GLAMO_REG_CLOCK_LCD,
+			    GLAMO_CLOCK_LCD_EN_M5CLK, 0);
+		/* stop dividing the clocks */
+		__reg_set_bit_mask(glamo, GLAMO_REG_CLOCK_GEN5_1,
+			    GLAMO_CLOCK_GEN51_EN_DIV_DHCLK |
+			    GLAMO_CLOCK_GEN51_EN_DIV_DMCLK |
+			    GLAMO_CLOCK_GEN51_EN_DIV_DCLK, 0);
+		__reg_set_bit_mask(glamo, GLAMO_REG_HOSTBUS(2),
+			    GLAMO_HOSTBUS2_MMIO_EN_LCD, 0);
+		break;
+
 	case GLAMO_ENGINE_MMC:
 		__reg_set_bit_mask(glamo, GLAMO_REG_CLOCK_MMC, 0,
 						   GLAMO_CLOCK_MMC_EN_M9CLK |
 						   GLAMO_CLOCK_MMC_EN_TCLK |
 						   GLAMO_CLOCK_MMC_DG_M9CLK |
 						   GLAMO_CLOCK_MMC_DG_TCLK);
-		__reg_set_bit_mask(glamo, GLAMO_REG_HOSTBUS(2), 0,
-						   GLAMO_HOSTBUS2_MMIO_EN_MMC);
 		/* disable the TCLK divider clk input */
 		__reg_set_bit_mask(glamo, GLAMO_REG_CLOCK_GEN5_1, 0,
 						GLAMO_CLOCK_GEN51_EN_DIV_TCLK);
+		__reg_set_bit_mask(glamo, GLAMO_REG_HOSTBUS(2), 0,
+						   GLAMO_HOSTBUS2_MMIO_EN_MMC);
 		/* good idea to hold the thing in reset when we power it off? */
 /*		writew(readw(glamo->base + GLAMO_REG_CLOCK_MMC) |
 		      GLAMO_CLOCK_MMC_RESET, glamo->base + GLAMO_REG_CLOCK_MMC);
@@ -461,10 +494,23 @@ int glamo_engine_disable(struct glamo_core *glamo, enum glamo_engine engine)
 	default:
 		break;
 	}
-	spin_unlock(&glamo->lock);
+
+	glamo->engine_enabled_bitfield &= ~(1 << engine);
 
 	return 0;
 }
+int glamo_engine_disable(struct glamo_core *glamo, enum glamo_engine engine)
+{
+	int ret;
+
+	spin_lock(&glamo->lock);
+
+	ret = __glamo_engine_disable(glamo, engine);
+
+	spin_unlock(&glamo->lock);
+
+	return ret;
+}
 EXPORT_SYMBOL_GPL(glamo_engine_disable);
 
 struct glamo_script reset_regs[] = {
@@ -618,7 +664,7 @@ int glamo_run_script(struct glamo_core *glamo, struct glamo_script *script,
 			if (may_sleep)
 				msleep(line->val);
 			else
-				mdelay(line->val);
+				mdelay(line->val * 4);
 			break;
 		case 0xfffd:
 			/* spin until PLLs lock */
@@ -717,111 +763,17 @@ static struct glamo_script glamo_init_script[] = {
 	{ GLAMO_REG_CLOCK_MEMORY,	0x000b },
 };
 
-static struct glamo_script glamo_resume_script[] = {
-	{ GLAMO_REG_IRQ_ENABLE,		0x01ff },
-	{ GLAMO_REG_CLOCK_GEN6,		0x2000 },
-	{ GLAMO_REG_CLOCK_GEN7,		0x0001 }, /* 0101 */
-	{ GLAMO_REG_CLOCK_GEN8,		0x0100 },
-	{ GLAMO_REG_CLOCK_HOST,		0x000d },
-	{ 0x200,	0x0ef0 },
-	{ 0x202, 	0x07ff },
-	{ 0x212,	0x0000 },
-	{ 0x214,	0x4000 },
-	{ 0x216,	0xf00e },
-	{ GLAMO_REG_MEM_TYPE,		0x0874 }, /* 8MB, 16 word pg wr+rd */
-	{ GLAMO_REG_MEM_GEN,		0xafaf }, /* 63 grants min + max */
-
-	{ GLAMO_REG_MEM_TIMING1,	0x0108 },
-	{ GLAMO_REG_MEM_TIMING2,	0x0010 }, /* Taa = 3 MCLK */
-	{ GLAMO_REG_MEM_TIMING3,	0x0000 },
-	{ GLAMO_REG_MEM_TIMING4,	0x0000 }, /* CE1# delay fall/rise */
-	{ GLAMO_REG_MEM_TIMING5,	0x0000 }, /* UB# LB# */
-	{ GLAMO_REG_MEM_TIMING6,	0x0000 }, /* OE# */
-	{ GLAMO_REG_MEM_TIMING7,	0x0000 }, /* WE# */
-	{ GLAMO_REG_MEM_TIMING8,	0x1002 }, /* MCLK delay, was 0x1000 */
-	{ GLAMO_REG_MEM_TIMING9,	0x6006 },
-	{ GLAMO_REG_MEM_TIMING10,	0x00ff },
-	{ GLAMO_REG_MEM_TIMING11,	0x0001 },
-	{ GLAMO_REG_MEM_POWER1,		0x0020 },
-	{ GLAMO_REG_MEM_POWER2,		0x0000 },
-	{ GLAMO_REG_MEM_DRAM1,		0x0000 },
-		{ 0xfffe, 1 },
-	{ GLAMO_REG_MEM_DRAM1,		0xc100 },
-		{ 0xfffe, 1 },
-	{ GLAMO_REG_MEM_DRAM1,		0xe100 },
-	{ GLAMO_REG_MEM_DRAM2,		0x01d6 },
-	{ GLAMO_REG_CLOCK_MEMORY,	0x000b },
-};
-
-#if 0 /* MM370 */
-static const struct glamo_script regs_vram_2mb = {
-	{ GLAMO_REG_CLOCK_MEMORY,	0x3aaa },
-		{ 0xfffe, 50 },
-	{ GLAMO_REG_CLOCK_MEMORY,	0x0aaa },
-		{ 0xfffe, 3 },
-	{ GLAMO_REG_MEM_POWER1,		0x0020 },
-	{ 0x033a,			0x0000 },
-	{ 0x033c,			0x0000 },
-	{ 0x033e,			0x0000 },
-	{ 0x0340,			0x0000 },
-	{ 0x0342,			0x0000 },
-	{ 0x0344,			0x0000 },
-	{ 0x0346,			0x0240 },
-	{ GLAMO_REG_MEM_TIMING8,	0x1016 },
-	{ GLAMO_REG_MEM_TIMING9,	0x6067 },
-	{ GLAMO_REG_MEM_TIMING10,	0x00ff },
-	{ GLAMO_REG_MEM_TIMING11,	0x0030 },
-	{ GLAMO_REG_MEM_GEN,		0x3fff },
-	{ GLAMO_REG_MEM_GEN,		0xafaf },
-	{ GLAMO_REG_MEM_TIMING1,	0x0108 },
-	{ GLAMO_REG_MEM_TIMING2,	0x0010 },
-	{ GLAMO_REG_MEM_DRAM1,		0x0a00 },
-		{ 0xfffe, 3 },
-	{ GLAMO_REG_MEM_DRAM1,		0xe200 },
-		{ 0xfffe, 1 },
-};
-
-static const struct glamo_script regs_vram_8mb = {
-	{ GLAMO_REG_CLOCK_MEMORY,	0x3aaa },
-		{ 0xfffe, 50 },
-	{ GLAMO_REG_CLOCK_MEMORY,	0x0aaa },
-		{ 0xfffe, 3 },
-	{ GLAMO_REG_MEM_POWER1,		0x0020 },
-	{ 0x033a,			0x45cf },
-	{ 0x033c, 			0x4240 },
-	{ 0x033e,			0x53e0 },
-	{ 0x0340,			0x1401 },
-	{ 0x0342,			0x0c44 },
-	{ 0x0344,			0x1d0b },
-	{ 0x0346,			0x25ac },
-	{ 0x0348,			0x1953 },
-		{ 0xfffe, 1 },
-	{ GLAMO_REG_MEM_TYPE,		0x087a },
-	{ GLAMO_REG_MEM_DRAM2,		0x01d6 },
-	{ GLAMO_REG_MEM_TIMING8,	0x1060 },
-	{ GLAMO_REG_MEM_TIMING9,	0x6067 },
-	{ GLAMO_REG_MEM_TIMING10,	0x00ff },
-	{ GLAMO_REG_MEM_TIMING11,	0x0030 },
-	{ GLAMO_REG_MEM_GEN,		0x3fff },
-	{ GLAMO_REG_MEM_GEN,		0xafaf },
-	{ GLAMO_REG_MEM_TIMING1,	0x3108 },
-	{ GLAMO_REG_MEM_TIMING2,	0x0010 },
-	{ GLAMO_REG_MEM_DRAM1,		0x0a00 },
-		{ 0xfffe, 3 },
-	{ GLAMO_REG_MEM_DRAM1,		0xe200 },
-		{ 0xfffe, 1 },
-};
-#endif
 
 enum glamo_power {
 	GLAMO_POWER_ON,
-	GLAMO_POWER_STANDBY,
 	GLAMO_POWER_SUSPEND,
 };
 
 static void glamo_power(struct glamo_core *glamo,
 			enum glamo_power new_state)
 {
+	int n;
+
 	spin_lock(&glamo->lock);
 
 	dev_dbg(&glamo->pdev->dev, "***** glamo_power -> %d\n", new_state);
@@ -836,37 +788,76 @@ static void glamo_power(struct glamo_core *glamo,
 		while ((__reg_read(glamo, GLAMO_REG_PLL_GEN5) & 3) != 3)
 			;
 
-		/* enable memory clock and get it out of deep pwrdown */
-		__reg_set_bit_mask(glamo, GLAMO_REG_CLOCK_MEMORY,
-				   GLAMO_CLOCK_MEM_EN_MOCACLK, 0xffff);
-		__reg_set_bit_mask(glamo, GLAMO_REG_MEM_DRAM2,
-				   GLAMO_MEM_DRAM2_DEEP_PWRDOWN, 0x0000);
-		__reg_set_bit_mask(glamo, GLAMO_REG_MEM_DRAM1,
-				   GLAMO_MEM_DRAM1_SELF_REFRESH, 0x0000);
-
-		glamo_run_script(glamo, glamo_resume_script,
-				 ARRAY_SIZE(glamo_resume_script), 0);
-
-		break;
-
-	case GLAMO_POWER_STANDBY:
-		/* enable memory self-refresh */
-		__reg_set_bit_mask(glamo, GLAMO_REG_MEM_DRAM1,
-				   GLAMO_MEM_DRAM1_SELF_REFRESH, 0xffff);
-		/* stop memory clock */
-		__reg_set_bit_mask(glamo, GLAMO_REG_CLOCK_MEMORY,
-				   GLAMO_CLOCK_MEM_EN_MOCACLK, 0x0000);
-		/* power down PLL2 and then PLL1 */
-		__reg_set_bit_mask(glamo, GLAMO_REG_PLL_GEN3, 0x2000, 0xffff);
-		__reg_set_bit_mask(glamo, GLAMO_REG_DFT_GEN5, 0x0001, 0xffff);
+		/* Get memory out of deep powerdown */
+
+		__reg_write(glamo, GLAMO_REG_MEM_DRAM2,
+					(7 << 6) | /* tRC */
+					(1 << 4) | /* tRP */
+					(1 << 2) | /* tRCD */
+					2); /* CAS latency */
+
+		/* Stop self-refresh */
+
+		__reg_write(glamo, GLAMO_REG_MEM_DRAM1,
+					GLAMO_MEM_DRAM1_EN_DRAM_REFRESH |
+					GLAMO_MEM_DRAM1_EN_GATE_CKE |
+					GLAMO_MEM_REFRESH_COUNT);
+		__reg_write(glamo, GLAMO_REG_MEM_DRAM1,
+					GLAMO_MEM_DRAM1_EN_MODEREG_SET |
+					GLAMO_MEM_DRAM1_EN_DRAM_REFRESH |
+					GLAMO_MEM_DRAM1_EN_GATE_CKE |
+					GLAMO_MEM_REFRESH_COUNT);
+
+		/* re-enable clocks to memory */
+
+		__reg_write(glamo, GLAMO_REG_CLOCK_MEMORY,
+					GLAMO_CLOCK_MEM_EN_MOCACLK |
+					GLAMO_CLOCK_MEM_EN_M1CLK |
+					GLAMO_CLOCK_MEM_DG_M1CLK);
+
+		/* restore each engine that was up before suspend */
+		for (n = 0; n < __NUM_GLAMO_ENGINES; n++)
+			if (glamo->engine_enabled_bitfield_suspend & (1 << n))
+				__glamo_engine_enable(glamo, n);
 		break;
 
 	case GLAMO_POWER_SUSPEND:
-		__reg_set_bit_mask(glamo, GLAMO_REG_MEM_DRAM2,
-				   GLAMO_MEM_DRAM2_DEEP_PWRDOWN, 0xffff);
-		/* stop memory clock */
-		__reg_set_bit_mask(glamo, GLAMO_REG_CLOCK_MEMORY,
-				   GLAMO_CLOCK_MEM_EN_MOCACLK, 0x0000);
+		/* stash a copy of which engines were running */
+		glamo->engine_enabled_bitfield_suspend =
+						 glamo->engine_enabled_bitfield;
+
+		/* take down each engine before we kill mem and pll */
+		for (n = 0; n < __NUM_GLAMO_ENGINES; n++)
+			if (glamo->engine_enabled_bitfield & (1 << n))
+				__glamo_engine_disable(glamo, n);
+
+		/* enable self-refresh */
+
+		__reg_write(glamo, GLAMO_REG_MEM_DRAM1,
+					GLAMO_MEM_DRAM1_EN_DRAM_REFRESH |
+					GLAMO_MEM_DRAM1_EN_GATE_CKE |
+					GLAMO_MEM_DRAM1_SELF_REFRESH |
+					GLAMO_MEM_REFRESH_COUNT);
+		__reg_write(glamo, GLAMO_REG_MEM_DRAM1,
+					GLAMO_MEM_DRAM1_EN_MODEREG_SET |
+					GLAMO_MEM_DRAM1_EN_DRAM_REFRESH |
+					GLAMO_MEM_DRAM1_EN_GATE_CKE |
+					GLAMO_MEM_DRAM1_SELF_REFRESH |
+					GLAMO_MEM_REFRESH_COUNT);
+
+		/* force RAM into deep powerdown */
+
+		__reg_write(glamo, GLAMO_REG_MEM_DRAM2,
+					GLAMO_MEM_DRAM2_DEEP_PWRDOWN |
+					(7 << 6) | /* tRC */
+					(1 << 4) | /* tRP */
+					(1 << 2) | /* tRCD */
+					2); /* CAS latency */
+
+		/* kill clocks to memory */
+
+		__reg_write(glamo, GLAMO_REG_CLOCK_MEMORY, 0);
+
 		/* power down PLL2 and then PLL1 */
 		__reg_set_bit_mask(glamo, GLAMO_REG_PLL_GEN3, 0x2000, 0xffff);
 		__reg_set_bit_mask(glamo, GLAMO_REG_DFT_GEN5, 0x0001, 0xffff);
@@ -1016,9 +1007,9 @@ static ssize_t regs_read(struct device *dev, struct device_attribute *attr,
 		char * name;
 	};
 	struct reg_range reg_range[] = {
-		{ 0x0000, 0x200, "General" },
+		{ 0x0000, 0x76, "General" },
 		{ 0x0200, 0x100, "Host Bus" },
-		{ 0x0300, 0x100, "Memory" },
+		{ 0x0300, 0x38, "Memory" },
 /*		{ 0x0400, 0x100, "Sensor" },
 		{ 0x0500, 0x300, "ISP" },
 		{ 0x0800, 0x400, "JPEG" },
@@ -1037,12 +1028,11 @@ static ssize_t regs_read(struct device *dev, struct device_attribute *attr,
 
 	for (r = 0; r < ARRAY_SIZE(reg_range); r++) {
 		n1 = 0;
-		end += sprintf(end, "\n%s\n\n", reg_range[r].name);
+		end += sprintf(end, "\n%s\n", reg_range[r].name);
 		for (n = reg_range[r].start;
 		     n < reg_range[r].start + reg_range[r].count; n += 2) {
 			if (((n1++) & 7) == 0)
-				end += sprintf(end, "\n%04X:  ",
-					       n + reg_range[r].start);
+				end += sprintf(end, "\n%04X:  ", n);
 			end += sprintf(end, "%04x ", __reg_read(glamo, n));
 		}
 		end += sprintf(end, "\n");
diff --git a/drivers/mfd/glamo/glamo-core.h b/drivers/mfd/glamo/glamo-core.h
index 82b95f5..8d647ec 100644
--- a/drivers/mfd/glamo/glamo-core.h
+++ b/drivers/mfd/glamo/glamo-core.h
@@ -30,6 +30,8 @@ struct glamo_core {
 	u_int16_t revision;
 	spinlock_t lock;
 	struct resume_dependency resume_dependency;
+	u32 engine_enabled_bitfield;
+	u32 engine_enabled_bitfield_suspend;
 };
 
 struct glamo_script {
diff --git a/drivers/mfd/glamo/glamo-regs.h b/drivers/mfd/glamo/glamo-regs.h
index 32411e3..2328b8a 100644
--- a/drivers/mfd/glamo/glamo-regs.h
+++ b/drivers/mfd/glamo/glamo-regs.h
@@ -142,8 +142,12 @@ enum glamo_register_mem {
 #define GLAMO_MEM_TYPE_MASK	0x03
 
 enum glamo_reg_mem_dram1 {
-	GLAMO_MEM_DRAM1_EN_SDRAM_CLK	= (1 << 11),
+	/* b0 - b10 == refresh period, 1 -> 2048 clocks */
+	GLAMO_MEM_DRAM1_EN_GATE_CLK	= (1 << 11),
 	GLAMO_MEM_DRAM1_SELF_REFRESH	= (1 << 12),
+	GLAMO_MEM_DRAM1_EN_GATE_CKE	= (1 << 13),
+	GLAMO_MEM_DRAM1_EN_DRAM_REFRESH	= (1 << 14),
+	GLAMO_MEM_DRAM1_EN_MODEREG_SET	= (1 << 15),
 };
 
 enum glamo_reg_mem_dram2 {
-- 
1.5.6.5