drm/amdgpu: save/restore backlight level in legacy dce code

Save/restore the backlight level scratch register in S3/S4 so the
backlight level comes back at the previously requested level.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=199047
Fixes: 4ec6ecf48c64d (drm/amdgpu: drop scratch regs save and restore from S3/S4 handling)
Acked-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
index d9533bb..588cf65 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
@@ -350,6 +350,7 @@ struct amdgpu_mode_info {
        u16 firmware_flags;
        /* pointer to backlight encoder */
        struct amdgpu_encoder *bl_encoder;
+       u8 bl_level; /* saved backlight level */
        struct amdgpu_audio     audio; /* audio stuff */
        int                     num_crtc; /* number of crtcs */
        int                     num_hpd; /* number of hpd pins */

diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
index 2af26d2..d702fb8 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
+++ b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
@@ -34,7 +34,7 @@
 #include <linux/backlight.h>
 #include "bif/bif_4_1_d.h"
 
-static u8
+u8
 amdgpu_atombios_encoder_get_backlight_level_from_reg(struct amdgpu_device *adev)
 {
        u8 backlight_level;
@@ -48,7 +48,7 @@ amdgpu_atombios_encoder_get_backlight_level_from_reg(struct amdgpu_device *adev)
        return backlight_level;
 }
 
-static void
+void
 amdgpu_atombios_encoder_set_backlight_level_to_reg(struct amdgpu_device *adev,
                                            u8 backlight_level)
 {

diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.h b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.h
index 2bdec40..f77cbde 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.h
+++ b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.h
@@ -25,6 +25,11 @@
 #define __ATOMBIOS_ENCODER_H__
 
 u8
+amdgpu_atombios_encoder_get_backlight_level_from_reg(struct amdgpu_device *adev);
+void
+amdgpu_atombios_encoder_set_backlight_level_to_reg(struct amdgpu_device *adev,
+                                                  u8 backlight_level);
+u8
 amdgpu_atombios_encoder_get_backlight_level(struct amdgpu_encoder *amdgpu_encoder);
 void
 amdgpu_atombios_encoder_set_backlight_level(struct amdgpu_encoder *amdgpu_encoder,

diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
index 7ea9000..452f88e 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
@@ -2862,6 +2862,11 @@ static int dce_v10_0_hw_fini(void *handle)
 
 static int dce_v10_0_suspend(void *handle)
 {
+       struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+       adev->mode_info.bl_level =
+               amdgpu_atombios_encoder_get_backlight_level_from_reg(adev);
+
        return dce_v10_0_hw_fini(handle);
 }
 
@@ -2870,6 +2875,9 @@ static int dce_v10_0_resume(void *handle)
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;
        int ret;
 
+       amdgpu_atombios_encoder_set_backlight_level_to_reg(adev,
+                                                          adev->mode_info.bl_level);
+
        ret = dce_v10_0_hw_init(handle);
 
        /* turn on the BL */

diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
index 158b92e..a7c1c58 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
@@ -2988,6 +2988,11 @@ static int dce_v11_0_hw_fini(void *handle)
 
 static int dce_v11_0_suspend(void *handle)
 {
+       struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+       adev->mode_info.bl_level =
+               amdgpu_atombios_encoder_get_backlight_level_from_reg(adev);
+
        return dce_v11_0_hw_fini(handle);
 }
 
@@ -2996,6 +3001,9 @@ static int dce_v11_0_resume(void *handle)
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;
        int ret;
 
+       amdgpu_atombios_encoder_set_backlight_level_to_reg(adev,
+                                                          adev->mode_info.bl_level);
+
        ret = dce_v11_0_hw_init(handle);
 
        /* turn on the BL */

diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
index ee2162e..9f67b7f 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
@@ -2730,6 +2730,11 @@ static int dce_v6_0_hw_fini(void *handle)
 
 static int dce_v6_0_suspend(void *handle)
 {
+       struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+       adev->mode_info.bl_level =
+               amdgpu_atombios_encoder_get_backlight_level_from_reg(adev);
+
        return dce_v6_0_hw_fini(handle);
 }
 
@@ -2738,6 +2743,9 @@ static int dce_v6_0_resume(void *handle)
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;
        int ret;
 
+       amdgpu_atombios_encoder_set_backlight_level_to_reg(adev,
+                                                          adev->mode_info.bl_level);
+
        ret = dce_v6_0_hw_init(handle);
 
        /* turn on the BL */

diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
index 8dbe97d..f55422c 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
@@ -2760,6 +2760,11 @@ static int dce_v8_0_hw_fini(void *handle)
 
 static int dce_v8_0_suspend(void *handle)
 {
+       struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+       adev->mode_info.bl_level =
+               amdgpu_atombios_encoder_get_backlight_level_from_reg(adev);
+
        return dce_v8_0_hw_fini(handle);
 }
 
@@ -2768,6 +2773,9 @@ static int dce_v8_0_resume(void *handle)
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;
        int ret;
 
+       amdgpu_atombios_encoder_set_backlight_level_to_reg(adev,
+                                                          adev->mode_info.bl_level);
+
        ret = dce_v8_0_hw_init(handle);
 
        /* turn on the BL */