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### Shell environment set up for builds. ###

You can now run 'bitbake <target>'

Common targets are:
    core-image-minimal
    core-image-sato
    meta-toolchain
    meta-ide-support

You can also run generated qemu images with a command like 'runqemu qemux86'

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From 70cc896479d8491bb6892312b54613439af01316 Mon Sep 17 00:00:00 2001
From: Maruthi Srinivas Bayyavarapu <Maruthi.Bayyavarapu@amd.com>
Date: Fri, 23 Sep 2016 17:35:10 +0530
Subject: [PATCH 07/17] drm/amd: Power management related modifications in the

amdgpu ACP driver.

Signed-off-by: Maruthi Bayyavarapu <maruthi.bayyavarapu@amd.com>
Signed-off-by: Kalyan Alle <kalyan.alle@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c | 206 +++++++++++++++++++++++++++++++-
 1 file changed, 205 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
index cbbc31a8..37ecc36 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
@@ -24,6 +24,7 @@
  */
 
 #include <linux/irqdomain.h>
+#include <linux/pm_domain.h>
 #include <linux/platform_device.h>
 #include <sound/designware_i2s.h>
 #include <sound/pcm.h>
@@ -102,6 +103,155 @@ static int acp_sw_fini(void *handle)
 	return 0;
 }
 
+/* power off a tile/block within ACP */
+static int acp_suspend_tile(void *cgs_dev, int tile)
+{
+	u32 val = 0;
+	u32 count = 0;
+
+	if ((tile  < ACP_TILE_P1) || (tile > ACP_TILE_DSP2)) {
+		pr_err("Invalid ACP tile : %d to suspend\n", tile);
+		return -1;
+	}
+
+	val = cgs_read_register(cgs_dev, mmACP_PGFSM_READ_REG_0 + tile);
+	val &= ACP_TILE_ON_MASK;
+
+	if (val == 0x0) {
+		val = cgs_read_register(cgs_dev, mmACP_PGFSM_RETAIN_REG);
+		val = val | (1 << tile);
+		cgs_write_register(cgs_dev, mmACP_PGFSM_RETAIN_REG, val);
+		cgs_write_register(cgs_dev, mmACP_PGFSM_CONFIG_REG,
+					0x500 + tile);
+
+		count = ACP_TIMEOUT_LOOP;
+		while (true) {
+			val = cgs_read_register(cgs_dev, mmACP_PGFSM_READ_REG_0
+								+ tile);
+			val = val & ACP_TILE_ON_MASK;
+			if (val == ACP_TILE_OFF_MASK)
+				break;
+			if (--count == 0) {
+				pr_err("Timeout reading ACP PGFSM status\n");
+				return -ETIMEDOUT;
+			}
+			udelay(100);
+		}
+
+		val = cgs_read_register(cgs_dev, mmACP_PGFSM_RETAIN_REG);
+
+		val |= ACP_TILE_OFF_RETAIN_REG_MASK;
+		cgs_write_register(cgs_dev, mmACP_PGFSM_RETAIN_REG, val);
+	}
+	return 0;
+}
+
+/* power on a tile/block within ACP */
+static int acp_resume_tile(void *cgs_dev, int tile)
+{
+	u32 val = 0;
+	u32 count = 0;
+
+	if ((tile  < ACP_TILE_P1) || (tile > ACP_TILE_DSP2)) {
+		pr_err("Invalid ACP tile to resume\n");
+		return -1;
+	}
+
+	val = cgs_read_register(cgs_dev, mmACP_PGFSM_READ_REG_0 + tile);
+	val = val & ACP_TILE_ON_MASK;
+
+	if (val != 0x0) {
+		cgs_write_register(cgs_dev, mmACP_PGFSM_CONFIG_REG,
+					0x600 + tile);
+		count = ACP_TIMEOUT_LOOP;
+		while (true) {
+			val = cgs_read_register(cgs_dev, mmACP_PGFSM_READ_REG_0
+							+ tile);
+			val = val & ACP_TILE_ON_MASK;
+			if (val == 0x0)
+				break;
+			if (--count == 0) {
+				pr_err("Timeout reading ACP PGFSM status\n");
+				return -ETIMEDOUT;
+			}
+			udelay(100);
+		}
+		val = cgs_read_register(cgs_dev, mmACP_PGFSM_RETAIN_REG);
+		if (tile == ACP_TILE_P1)
+			val = val & (ACP_TILE_P1_MASK);
+		else if (tile == ACP_TILE_P2)
+			val = val & (ACP_TILE_P2_MASK);
+
+		cgs_write_register(cgs_dev, mmACP_PGFSM_RETAIN_REG, val);
+	}
+	return 0;
+}
+
+struct acp_pm_domain {
+	void *cgs_dev;
+	struct generic_pm_domain gpd;
+};
+
+static int acp_poweroff(struct generic_pm_domain *genpd)
+{
+	int i, ret;
+	struct acp_pm_domain *apd;
+
+	apd = container_of(genpd, struct acp_pm_domain, gpd);
+	if (apd != NULL) {
+		/* Donot return abruptly if any of power tile fails to suspend.
+		 * Log it and continue powering off other tile
+		 */
+		for (i = 4; i >= 0 ; i--) {
+			ret = acp_suspend_tile(apd->cgs_dev, ACP_TILE_P1 + i);
+			if (ret)
+				pr_err("ACP tile %d tile suspend failed\n", i);
+		}
+	}
+	return 0;
+}
+
+static int acp_poweron(struct generic_pm_domain *genpd)
+{
+	int i, ret;
+	struct acp_pm_domain *apd;
+
+	apd = container_of(genpd, struct acp_pm_domain, gpd);
+	if (apd != NULL) {
+		for (i = 0; i < 2; i++) {
+			ret = acp_resume_tile(apd->cgs_dev, ACP_TILE_P1 + i);
+			if (ret) {
+				pr_err("ACP tile %d resume failed\n", i);
+				break;
+			}
+		}
+
+		/* Disable DSPs which are not going to be used */
+		for (i = 0; i < 3; i++) {
+			ret = acp_suspend_tile(apd->cgs_dev, ACP_TILE_DSP0 + i);
+			/* Continue suspending other DSP, even if one fails */
+			if (ret)
+				pr_err("ACP DSP %d suspend failed\n", i);
+		}
+	}
+	return 0;
+}
+
+static struct device *get_mfd_cell_dev(const char *device_name, int r)
+{
+	char auto_dev_name[25];
+	char buf[8];
+	struct device *dev;
+
+	sprintf(buf, ".%d.auto", r);
+	strcpy(auto_dev_name, device_name);
+	strcat(auto_dev_name, buf);
+	dev = bus_find_device_by_name(&platform_bus_type, NULL, auto_dev_name);
+	dev_info(dev, "device %s added to pm domain\n", auto_dev_name);
+
+	return dev;
+}
+
 /**
  * acp_hw_init - start and test ACP block
  *
@@ -110,8 +260,9 @@ static int acp_sw_fini(void *handle)
  */
 static int acp_hw_init(void *handle)
 {
-	int r;
+	int r, i;
 	uint64_t acp_base;
+	struct device *dev;
 	struct i2s_platform_data *i2s_pdata;
 
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
@@ -137,6 +288,19 @@ static int acp_hw_init(void *handle)
 	else if (r)
 		return r;
 
+	adev->acp.acp_genpd = kzalloc(sizeof(struct acp_pm_domain), GFP_KERNEL);
+	if (adev->acp.acp_genpd == NULL)
+		return -ENOMEM;
+
+	adev->acp.acp_genpd->gpd.name = "ACP_AUDIO";
+	adev->acp.acp_genpd->gpd.power_off = acp_poweroff;
+	adev->acp.acp_genpd->gpd.power_on = acp_poweron;
+
+
+	adev->acp.acp_genpd->cgs_dev = adev->acp.cgs_device;
+
+	pm_genpd_init(&adev->acp.acp_genpd->gpd, NULL, false);
+
 	adev->acp.acp_cell = kzalloc(sizeof(struct mfd_cell) * ACP_DEVS,
 							GFP_KERNEL);
 
@@ -211,6 +375,15 @@ static int acp_hw_init(void *handle)
 	if (r)
 		return r;
 
+	for (i = 0; i < ACP_DEVS ; i++) {
+		dev = get_mfd_cell_dev(adev->acp.acp_cell[i].name, i);
+		r = pm_genpd_add_device(&adev->acp.acp_genpd->gpd, dev);
+		if (r) {
+			dev_err(dev, "Failed to add dev to genpd\n");
+			return r;
+		}
+	}
+
 	return 0;
 }
 
@@ -222,10 +395,22 @@ static int acp_hw_init(void *handle)
  */
 static int acp_hw_fini(void *handle)
 {
+	int i, ret;
+	struct device *dev;
+
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
+	for (i = 0; i < ACP_DEVS ; i++) {
+		dev = get_mfd_cell_dev(adev->acp.acp_cell[i].name, i);
+		ret = pm_genpd_remove_device(&adev->acp.acp_genpd->gpd, dev);
+		/* If removal fails, dont giveup and try rest */
+		if (ret)
+			dev_err(dev, "remove dev from genpd failed\n");
+	}
+
 	mfd_remove_devices(adev->acp.parent);
 	kfree(adev->acp.acp_res);
+	kfree(adev->acp.acp_genpd);
 	kfree(adev->acp.acp_cell);
 
 	return 0;
@@ -238,6 +423,25 @@ static int acp_suspend(void *handle)
 
 static int acp_resume(void *handle)
 {
+	int i, ret;
+	struct acp_pm_domain *apd;
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	/* SMU block will power on ACP irrespective of ACP runtime status.
+	 * Power off explicitly based on genpd ACP runtime status so that ACP
+	 * hw and ACP-genpd status are in sync.
+	 * 'suspend_power_off' represents "Power status before system suspend"
+	*/
+	if (adev->acp.acp_genpd->gpd.suspend_power_off == true) {
+		apd = container_of(&adev->acp.acp_genpd->gpd,
+					struct acp_pm_domain, gpd);
+
+		for (i = 4; i >= 0 ; i--) {
+			ret = acp_suspend_tile(apd->cgs_dev, ACP_TILE_P1 + i);
+			if (ret)
+				pr_err("ACP tile %d tile suspend failed\n", i);
+		}
+	}
 	return 0;
 }
 
-- 
2.7.4