[PATCH v5 14/17] platform/x86/amd/pmf: Add PMF-AMDGPU set interface

[Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>]

For the Smart PC Solution to fully work, it has to enact to the actions
coming from TA. Add the initial code path for set interface to AMDGPU.

Change amd_pmf_apply_policies() return type, so that it can return
errors when the call to retrieve information from amdgpu fails.

Co-developed-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>
---
 drivers/platform/x86/amd/pmf/pmf.h    |  2 ++
 drivers/platform/x86/amd/pmf/tee-if.c | 39 +++++++++++++++++++++++++--
 2 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/amd/pmf/pmf.h b/drivers/platform/x86/amd/pmf/pmf.h
index 525308519fa3..6e680637a631 100644
--- a/drivers/platform/x86/amd/pmf/pmf.h
+++ b/drivers/platform/x86/amd/pmf/pmf.h
@@ -78,6 +78,7 @@
 #define PMF_POLICY_STT_SKINTEMP_APU				7
 #define PMF_POLICY_STT_SKINTEMP_HS2				8
 #define PMF_POLICY_SYSTEM_STATE					9
+#define PMF_POLICY_DISPLAY_BRIGHTNESS				12
 #define PMF_POLICY_P3T						38
 
 /* TA macros */
@@ -503,6 +504,7 @@ enum ta_pmf_error_type {
 };
 
 struct pmf_action_table {
+	unsigned long display_brightness;
 	enum system_state system_state;
 	u32 spl;		/* in mW */
 	u32 sppt;		/* in mW */
diff --git a/drivers/platform/x86/amd/pmf/tee-if.c b/drivers/platform/x86/amd/pmf/tee-if.c
index 82ee2b1c627f..94a2afd84b56 100644
--- a/drivers/platform/x86/amd/pmf/tee-if.c
+++ b/drivers/platform/x86/amd/pmf/tee-if.c
@@ -77,8 +77,10 @@ static int amd_pmf_update_uevents(struct amd_pmf_dev *dev, u16 event)
 	return 0;
 }
 
-static void amd_pmf_apply_policies(struct amd_pmf_dev *dev, struct ta_pmf_enact_result *out)
+static int amd_pmf_apply_policies(struct amd_pmf_dev *dev, struct ta_pmf_enact_result *out)
 {
+	struct thermal_cooling_device *cdev = dev->gfx_data.cooling_dev;
+	unsigned long state;
 	u32 val;
 	int idx;
 
@@ -154,8 +156,21 @@ static void amd_pmf_apply_policies(struct amd_pmf_dev *dev, struct ta_pmf_enact_
 			dev_dbg(dev->dev, "update SYSTEM_STATE: %s\n",
 				amd_pmf_uevent_as_str(val));
 			break;
+
+		case PMF_POLICY_DISPLAY_BRIGHTNESS:
+			if (!dev->drm_dev)
+				return -ENODEV;
+
+			cdev->ops->get_cur_state(cdev, &state);
+			if (state != val) {
+				cdev->ops->set_cur_state(cdev, val);
+				dev_dbg(dev->dev, "update DISPLAY_BRIGHTNESS: %u\n", val);
+			}
+			break;
 		}
 	}
+
+	return 0;
 }
 
 static int amd_pmf_invoke_cmd_enact(struct amd_pmf_dev *dev)
@@ -192,7 +207,9 @@ static int amd_pmf_invoke_cmd_enact(struct amd_pmf_dev *dev)
 		amd_pmf_dump_ta_inputs(dev, in);
 		dev_dbg(dev->dev, "action count:%u result:%x\n", out->actions_count,
 			ta_sm->pmf_result);
-		amd_pmf_apply_policies(dev, out);
+		ret = amd_pmf_apply_policies(dev, out);
+		if (ret)
+			return ret;
 	}
 
 	return 0;
@@ -423,6 +440,23 @@ static void amd_pmf_tee_deinit(struct amd_pmf_dev *dev)
 	tee_client_close_context(dev->tee_ctx);
 }
 
+static int amd_pmf_gpu_set_cur_state(struct thermal_cooling_device *cooling_dev,
+				     unsigned long state)
+{
+	struct backlight_device *bd;
+
+	if (acpi_video_get_backlight_type() != acpi_backlight_native)
+		return -ENODEV;
+
+	bd = backlight_device_get_by_type(BACKLIGHT_RAW);
+	if (!bd)
+		return -ENODEV;
+
+	backlight_device_set_brightness(bd, state);
+
+	return 0;
+}
+
 static int amd_pmf_gpu_get_cur_state(struct thermal_cooling_device *cooling_dev,
 				     unsigned long *state)
 {
@@ -463,6 +497,7 @@ static int amd_pmf_gpu_get_max_state(struct thermal_cooling_device *cooling_dev,
 static const struct thermal_cooling_device_ops bd_cooling_ops = {
 	.get_max_state = amd_pmf_gpu_get_max_state,
 	.get_cur_state = amd_pmf_gpu_get_cur_state,
+	.set_cur_state = amd_pmf_gpu_set_cur_state,
 };
 
 static int amd_pmf_get_gpu_handle(struct pci_dev *pdev, void *data)
-- 
2.25.1