[PATCH 13/15] platform/x86/amd/pmf: Add PMF-AMDGPU set interface

[Shyam Sundar S K]

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.

Co-developed-by: Mario Limonciello <mario.limoncie...@amd.com>
Signed-off-by: Mario Limonciello <mario.limoncie...@amd.com>
Signed-off-by: Shyam Sundar S K <shyam-sundar....@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_pmf.c | 21 +++++++++++++++++++++
 drivers/platform/x86/amd/pmf/pmf.h      |  2 ++
 drivers/platform/x86/amd/pmf/tee-if.c   | 19 +++++++++++++++++--
 include/linux/amd-pmf-io.h              |  1 +
 4 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmf.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmf.c
index 232d11833ddc..5c567bff0548 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmf.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmf.c
@@ -68,3 +68,24 @@ int amd_pmf_get_gfx_data(struct amd_gpu_pmf_data *pmf)
        return 0;
 }
 EXPORT_SYMBOL_GPL(amd_pmf_get_gfx_data);
+
+int amd_pmf_set_gfx_data(struct amd_gpu_pmf_data *pmf)
+{
+       struct drm_device *drm_dev = pci_get_drvdata(pmf->gpu_dev);
+       struct amdgpu_device *adev = drm_to_adev(drm_dev);
+       struct backlight_device *bd;
+
+       if (!(adev->flags & AMD_IS_APU)) {
+               DRM_ERROR("PMF-AMDGPU interface not supported\n");
+               return -ENODEV;
+       }
+
+       bd = backlight_device_get_by_type(BACKLIGHT_RAW);
+       if (!bd)
+               return -ENODEV;
+
+       backlight_device_set_brightness(bd, pmf->brightness);
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(amd_pmf_set_gfx_data);
diff --git a/drivers/platform/x86/amd/pmf/pmf.h 
b/drivers/platform/x86/amd/pmf/pmf.h
index 9032df4ba48a..ce89cc0daa5a 100644
--- a/drivers/platform/x86/amd/pmf/pmf.h
+++ b/drivers/platform/x86/amd/pmf/pmf.h
@@ -73,6 +73,7 @@
 #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 */
@@ -480,6 +481,7 @@ enum ta_pmf_error_type {
 };
 
 struct pmf_action_table {
+       unsigned long display_brightness;
        enum system_state system_state;
        unsigned long spl; /* in mW */
        unsigned long sppt; /* in mW */
diff --git a/drivers/platform/x86/amd/pmf/tee-if.c 
b/drivers/platform/x86/amd/pmf/tee-if.c
index 1608996654e8..eefffff83a4c 100644
--- a/drivers/platform/x86/amd/pmf/tee-if.c
+++ b/drivers/platform/x86/amd/pmf/tee-if.c
@@ -79,10 +79,10 @@ 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)
 {
        u32 val, event = 0;
-       int idx;
+       int idx, ret;
 
        for (idx = 0; idx < out->actions_count; idx++) {
                val = out->actions_list[idx].value;
@@ -160,8 +160,23 @@ static void amd_pmf_apply_policies(struct amd_pmf_dev 
*dev, struct ta_pmf_enact_
                                dev->prev_data->system_state = 0;
                        }
                        break;
+
+               case PMF_POLICY_DISPLAY_BRIGHTNESS:
+                       ret = amd_pmf_get_gfx_data(&dev->gfx_data);
+                       if (ret)
+                               return ret;
+
+                       dev->prev_data->display_brightness = 
dev->gfx_data.brightness;
+                       if (dev->prev_data->display_brightness != val) {
+                               dev->gfx_data.brightness = val;
+                               amd_pmf_set_gfx_data(&dev->gfx_data);
+                               dev_dbg(dev->dev, "update DISPLAY_BRIGHTNESS : 
%d\n", val);
+                       }
+                       break;
                }
        }
+
+       return 0;
 }
 
 static int amd_pmf_invoke_cmd_enact(struct amd_pmf_dev *dev)
diff --git a/include/linux/amd-pmf-io.h b/include/linux/amd-pmf-io.h
index a2d4af231362..ecae387ddaa6 100644
--- a/include/linux/amd-pmf-io.h
+++ b/include/linux/amd-pmf-io.h
@@ -25,4 +25,5 @@ struct amd_gpu_pmf_data {
 };
 
 int amd_pmf_get_gfx_data(struct amd_gpu_pmf_data *pmf);
+int amd_pmf_set_gfx_data(struct amd_gpu_pmf_data *pmf);
 #endif
-- 
2.25.1