From b66758eeb96ed3aff035a58a3305315d1ff82103 Mon Sep 17 00:00:00 2001
From: Mohammed Mirza Mandayappurath Manzoor <mmandaya@codeaurora.org>
Date: Mon, 22 Jun 2020 17:11:55 -0700
Subject: [PATCH] msm: kgsl: Add Battery Current Limiting support for A6xx

Battery Current Limiting (BCL) prevents voltage droops and peak currents
on battery packs preventing under voltage lockout and over current.

Change-Id: Ie6c3753bbe21a801b9c6ee1ac9aec03c0de156b7
Signed-off-by: Mohammed Mirza Mandayappurath Manzoor <mmandaya@codeaurora.org>
---
 drivers/gpu/msm/adreno.h          |  4 ++++
 drivers/gpu/msm/adreno_a6xx_gmu.c |  3 +++
 drivers/gpu/msm/adreno_a6xx_hfi.c | 16 ++++++++++++++++
 drivers/gpu/msm/adreno_sysfs.c    | 17 +++++++++++++++++
 4 files changed, 40 insertions(+)

diff --git a/drivers/gpu/msm/adreno.h b/drivers/gpu/msm/adreno.h
index 7ee2dbc8e4d0..fff4dc267c30 100644
--- a/drivers/gpu/msm/adreno.h
+++ b/drivers/gpu/msm/adreno.h
@@ -109,6 +109,8 @@
 #define ADRENO_DEPRECATED BIT(19)
 /* The target supports ringbuffer level APRIV */
 #define ADRENO_APRIV BIT(20)
+/* The GMU supports Battery Current Limiting */
+#define ADRENO_BCL BIT(21)
 /*
  * Adreno GPU quirks - control bits for various workarounds
  */
@@ -528,6 +530,8 @@ struct adreno_device {
 	bool throttling_enabled;
 	/** @sptp_pc_enabled: True if SPTP power collapse is enabled on a5xx */
 	bool sptp_pc_enabled;
+	/** @bcl_enabled: True if BCL is enabled */
+	bool bcl_enabled;
 	struct kgsl_memdesc *profile_buffer;
 	unsigned int profile_index;
 	struct kgsl_memdesc *pwrup_reglist;
diff --git a/drivers/gpu/msm/adreno_a6xx_gmu.c b/drivers/gpu/msm/adreno_a6xx_gmu.c
index ecc5461e2ee7..b4d54880adad 100644
--- a/drivers/gpu/msm/adreno_a6xx_gmu.c
+++ b/drivers/gpu/msm/adreno_a6xx_gmu.c
@@ -2627,6 +2627,9 @@ static int a6xx_gmu_probe(struct kgsl_device *device,
 	else
 		gmu->idle_level = GPU_HW_ACTIVE;
 
+	if (ADRENO_FEATURE(adreno_dev, ADRENO_BCL))
+		adreno_dev->bcl_enabled = true;
+
 	a6xx_gmu_acd_probe(device, gmu, pdev->dev.of_node);
 
 	set_bit(GMU_ENABLED, &device->gmu_core.flags);
diff --git a/drivers/gpu/msm/adreno_a6xx_hfi.c b/drivers/gpu/msm/adreno_a6xx_hfi.c
index 06bbe3561e04..e16d6e6ee064 100644
--- a/drivers/gpu/msm/adreno_a6xx_hfi.c
+++ b/drivers/gpu/msm/adreno_a6xx_hfi.c
@@ -635,6 +635,18 @@ static int a6xx_hfi_verify_fw_version(struct adreno_device *adreno_dev)
 	return 0;
 }
 
+static int a6xx_hfi_send_bcl_feature_ctrl(struct adreno_device *adreno_dev)
+{
+	int ret;
+
+	if (!adreno_dev->bcl_enabled)
+		return 0;
+
+	ret = a6xx_hfi_send_feature_ctrl(adreno_dev, HFI_FEATURE_BCL, 1, 0);
+
+	return ret;
+}
+
 static int a6xx_hfi_send_lm_feature_ctrl(struct adreno_device *adreno_dev)
 {
 	struct kgsl_device *device = KGSL_DEVICE(adreno_dev);
@@ -739,6 +751,10 @@ int a6xx_hfi_start(struct adreno_device *adreno_dev)
 		if (result)
 			goto err;
 
+		result = a6xx_hfi_send_bcl_feature_ctrl(adreno_dev);
+		if (result)
+			goto err;
+
 		result = a6xx_hfi_send_core_fw_start(adreno_dev);
 		if (result)
 			goto err;
diff --git a/drivers/gpu/msm/adreno_sysfs.c b/drivers/gpu/msm/adreno_sysfs.c
index 72f314257605..40c11c7d715b 100644
--- a/drivers/gpu/msm/adreno_sysfs.c
+++ b/drivers/gpu/msm/adreno_sysfs.c
@@ -264,6 +264,21 @@ static int _acd_store(struct adreno_device *adreno_dev, bool val)
 	return gmu_core_dev_acd_set(KGSL_DEVICE(adreno_dev), val);
 }
 
+static bool _bcl_show(struct adreno_device *adreno_dev)
+{
+	return adreno_dev->bcl_enabled;
+}
+
+static int _bcl_store(struct adreno_device *adreno_dev, bool val)
+{
+	if (!ADRENO_FEATURE(adreno_dev, ADRENO_BCL) ||
+				adreno_dev->bcl_enabled == val)
+		return 0;
+
+	return adreno_power_cycle_bool(adreno_dev, &adreno_dev->bcl_enabled,
+					val);
+}
+
 static ssize_t _sysfs_store_u32(struct device *dev,
 		struct device_attribute *attr,
 		const char *buf, size_t count)
@@ -376,6 +391,7 @@ static ADRENO_SYSFS_BOOL(throttling);
 static ADRENO_SYSFS_BOOL(ifpc);
 static ADRENO_SYSFS_RO_U32(ifpc_count);
 static ADRENO_SYSFS_BOOL(acd);
+static ADRENO_SYSFS_BOOL(bcl);
 
 
 static const struct attribute *_attr_list[] = {
@@ -399,6 +415,7 @@ static const struct attribute *_attr_list[] = {
 	&adreno_attr_ifpc_count.attr.attr,
 	&adreno_attr_preempt_count.attr.attr,
 	&adreno_attr_acd.attr.attr,
+	&adreno_attr_bcl.attr.attr,
 	NULL,
 };