drm/radeon: add backlight control for atom devices (v2)

On systems that use the build in GPU backlight controller,
we can use atom tables to change the brightness level.

v2: use firmware flags

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index 6e8803a..f3645e1 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -28,9 +28,238 @@
 #include "radeon_drm.h"
 #include "radeon.h"
 #include "atom.h"
+#include <linux/backlight.h>
 
 extern int atom_debug;
 
+#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
+
+static u8
+radeon_atom_get_backlight_level_from_reg(struct radeon_device *rdev)
+{
+       u8 backlight_level;
+       u32 bios_2_scratch;
+
+       if (rdev->family >= CHIP_R600)
+               bios_2_scratch = RREG32(R600_BIOS_2_SCRATCH);
+       else
+               bios_2_scratch = RREG32(RADEON_BIOS_2_SCRATCH);
+
+       backlight_level = ((bios_2_scratch & ATOM_S2_CURRENT_BL_LEVEL_MASK) >>
+                          ATOM_S2_CURRENT_BL_LEVEL_SHIFT);
+
+       return backlight_level;
+}
+
+static void
+radeon_atom_set_backlight_level_to_reg(struct radeon_device *rdev,
+                                      u8 backlight_level)
+{
+       u32 bios_2_scratch;
+
+       if (rdev->family >= CHIP_R600)
+               bios_2_scratch = RREG32(R600_BIOS_2_SCRATCH);
+       else
+               bios_2_scratch = RREG32(RADEON_BIOS_2_SCRATCH);
+
+       bios_2_scratch &= ~ATOM_S2_CURRENT_BL_LEVEL_MASK;
+       bios_2_scratch |= ((backlight_level << ATOM_S2_CURRENT_BL_LEVEL_SHIFT) &
+                          ATOM_S2_CURRENT_BL_LEVEL_MASK);
+
+       if (rdev->family >= CHIP_R600)
+               WREG32(R600_BIOS_2_SCRATCH, bios_2_scratch);
+       else
+               WREG32(RADEON_BIOS_2_SCRATCH, bios_2_scratch);
+}
+
+static void
+atombios_set_panel_brightness(struct radeon_encoder *radeon_encoder)
+{
+       struct drm_encoder *encoder = &radeon_encoder->base;
+       struct drm_device *dev = radeon_encoder->base.dev;
+       struct radeon_device *rdev = dev->dev_private;
+       struct radeon_encoder_atom_dig *dig;
+       DISPLAY_DEVICE_OUTPUT_CONTROL_PS_ALLOCATION args;
+       int index;
+
+       if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) {
+               dig = radeon_encoder->enc_priv;
+               radeon_atom_set_backlight_level_to_reg(rdev, dig->backlight_level);
+
+               switch (radeon_encoder->encoder_id) {
+               case ENCODER_OBJECT_ID_INTERNAL_LVDS:
+               case ENCODER_OBJECT_ID_INTERNAL_LVTM1:
+                       index = GetIndexIntoMasterTable(COMMAND, LCD1OutputControl);
+                       if (dig->backlight_level == 0) {
+                               args.ucAction = ATOM_LCD_BLOFF;
+                               atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
+                       } else {
+                               args.ucAction = ATOM_LCD_BL_BRIGHTNESS_CONTROL;
+                               atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
+                               args.ucAction = ATOM_LCD_BLON;
+                               atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
+                       }
+                       break;
+               case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
+               case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:
+               case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1:
+               case ENCODER_OBJECT_ID_INTERNAL_UNIPHY2:
+                       if (dig->backlight_level == 0)
+                               atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_LCD_BLOFF, 0, 0);
+                       else {
+                               atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_BL_BRIGHTNESS_CONTROL, 0, 0);
+                               atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_LCD_BLON, 0, 0);
+                       }
+                       break;
+               default:
+                       break;
+               }
+       }
+}
+
+static u8 radeon_atom_bl_level(struct backlight_device *bd)
+{
+       u8 level;
+
+       /* Convert brightness to hardware level */
+       if (bd->props.brightness < 0)
+               level = 0;
+       else if (bd->props.brightness > RADEON_MAX_BL_LEVEL)
+               level = RADEON_MAX_BL_LEVEL;
+       else
+               level = bd->props.brightness;
+
+       return level;
+}
+
+static int radeon_atom_backlight_update_status(struct backlight_device *bd)
+{
+       struct radeon_backlight_privdata *pdata = bl_get_data(bd);
+       struct radeon_encoder *radeon_encoder = pdata->encoder;
+
+       if (radeon_encoder->enc_priv) {
+               struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
+               dig->backlight_level = radeon_atom_bl_level(bd);
+               atombios_set_panel_brightness(radeon_encoder);
+       }
+
+       return 0;
+}
+
+static int radeon_atom_backlight_get_brightness(struct backlight_device *bd)
+{
+       struct radeon_backlight_privdata *pdata = bl_get_data(bd);
+       struct radeon_encoder *radeon_encoder = pdata->encoder;
+       struct drm_device *dev = radeon_encoder->base.dev;
+       struct radeon_device *rdev = dev->dev_private;
+
+       return radeon_atom_get_backlight_level_from_reg(rdev);
+}
+
+static const struct backlight_ops radeon_atom_backlight_ops = {
+       .get_brightness = radeon_atom_backlight_get_brightness,
+       .update_status  = radeon_atom_backlight_update_status,
+};
+
+void radeon_atom_backlight_init(struct radeon_encoder *radeon_encoder,
+                               struct drm_connector *drm_connector)
+{
+       struct drm_device *dev = radeon_encoder->base.dev;
+       struct radeon_device *rdev = dev->dev_private;
+       struct backlight_device *bd;
+       struct backlight_properties props;
+       struct radeon_backlight_privdata *pdata;
+       struct radeon_encoder_atom_dig *dig;
+       u8 backlight_level;
+
+       if (!radeon_encoder->enc_priv)
+               return;
+
+       if (!rdev->is_atom_bios)
+               return;
+
+       if (!(rdev->mode_info.firmware_flags & ATOM_BIOS_INFO_BL_CONTROLLED_BY_GPU))
+               return;
+
+       pdata = kmalloc(sizeof(struct radeon_backlight_privdata), GFP_KERNEL);
+       if (!pdata) {
+               DRM_ERROR("Memory allocation failed\n");
+               goto error;
+       }
+
+       memset(&props, 0, sizeof(props));
+       props.max_brightness = RADEON_MAX_BL_LEVEL;
+       props.type = BACKLIGHT_RAW;
+       bd = backlight_device_register("radeon_bl", &drm_connector->kdev,
+                                      pdata, &radeon_atom_backlight_ops, &props);
+       if (IS_ERR(bd)) {
+               DRM_ERROR("Backlight registration failed\n");
+               goto error;
+       }
+
+       pdata->encoder = radeon_encoder;
+
+       backlight_level = radeon_atom_get_backlight_level_from_reg(rdev);
+
+       dig = radeon_encoder->enc_priv;
+       dig->bl_dev = bd;
+
+       bd->props.brightness = radeon_atom_backlight_get_brightness(bd);
+       bd->props.power = FB_BLANK_UNBLANK;
+       backlight_update_status(bd);
+
+       DRM_INFO("radeon atom DIG backlight initialized\n");
+
+       return;
+
+error:
+       kfree(pdata);
+       return;
+}
+
+static void radeon_atom_backlight_exit(struct radeon_encoder *radeon_encoder)
+{
+       struct drm_device *dev = radeon_encoder->base.dev;
+       struct radeon_device *rdev = dev->dev_private;
+       struct backlight_device *bd = NULL;
+       struct radeon_encoder_atom_dig *dig;
+
+       if (!radeon_encoder->enc_priv)
+               return;
+
+       if (!rdev->is_atom_bios)
+               return;
+
+       if (!(rdev->mode_info.firmware_flags & ATOM_BIOS_INFO_BL_CONTROLLED_BY_GPU))
+               return;
+
+       dig = radeon_encoder->enc_priv;
+       bd = dig->bl_dev;
+       dig->bl_dev = NULL;
+
+       if (bd) {
+               struct radeon_legacy_backlight_privdata *pdata;
+
+               pdata = bl_get_data(bd);
+               backlight_device_unregister(bd);
+               kfree(pdata);
+
+               DRM_INFO("radeon atom LVDS backlight unloaded\n");
+       }
+}
+
+#else /* !CONFIG_BACKLIGHT_CLASS_DEVICE */
+
+void radeon_atom_backlight_init(struct radeon_encoder *encoder)
+{
+}
+
+static void radeon_atom_backlight_exit(struct radeon_encoder *encoder)
+{
+}
+
+#endif
+
 /* evil but including atombios.h is much worse */
 bool radeon_atom_get_tv_timings(struct radeon_device *rdev, int index,
                                struct drm_display_mode *mode);
@@ -2286,6 +2515,8 @@ static const struct drm_encoder_helper_funcs radeon_atom_dac_helper_funcs = {
 void radeon_enc_destroy(struct drm_encoder *encoder)
 {
        struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
+       if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT))
+               radeon_atom_backlight_exit(radeon_encoder);
        kfree(radeon_encoder->enc_priv);
        drm_encoder_cleanup(encoder);
        kfree(radeon_encoder);

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index 895e628..748c5f2 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -40,10 +40,6 @@ radeon_atombios_connected_scratch_regs(struct drm_connector *connector,
                                       struct drm_encoder *encoder,
                                       bool connected);
 
-extern void
-radeon_legacy_backlight_init(struct radeon_encoder *radeon_encoder,
-                            struct drm_connector *drm_connector);
-
 void radeon_connector_hotplug(struct drm_connector *connector)
 {
        struct drm_device *dev = connector->dev;
@@ -2008,15 +2004,4 @@ radeon_add_legacy_connector(struct drm_device *dev,
                connector->polled = DRM_CONNECTOR_POLL_HPD;
        connector->display_info.subpixel_order = subpixel_order;
        drm_sysfs_connector_add(connector);
-       if (connector_type == DRM_MODE_CONNECTOR_LVDS) {
-               struct drm_encoder *drm_encoder;
-
-               list_for_each_entry(drm_encoder, &dev->mode_config.encoder_list, head) {
-                       struct radeon_encoder *radeon_encoder;
-
-                       radeon_encoder = to_radeon_encoder(drm_encoder);
-                       if (radeon_encoder->encoder_id == ENCODER_OBJECT_ID_INTERNAL_LVDS)
-                               radeon_legacy_backlight_init(radeon_encoder, connector);
-               }
-       }
 }

diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index 7467069..93b0d64 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -29,6 +29,14 @@
 #include "radeon.h"
 #include "atom.h"
 
+extern void
+radeon_legacy_backlight_init(struct radeon_encoder *radeon_encoder,
+                            struct drm_connector *drm_connector);
+extern void
+radeon_atom_backlight_init(struct radeon_encoder *radeon_encoder,
+                          struct drm_connector *drm_connector);
+
+
 static uint32_t radeon_encoder_clones(struct drm_encoder *encoder)
 {
        struct drm_device *dev = encoder->dev;
@@ -153,6 +161,7 @@ radeon_get_encoder_enum(struct drm_device *dev, uint32_t supported_device, uint8
 void
 radeon_link_encoder_connector(struct drm_device *dev)
 {
+       struct radeon_device *rdev = dev->dev_private;
        struct drm_connector *connector;
        struct radeon_connector *radeon_connector;
        struct drm_encoder *encoder;
@@ -163,8 +172,15 @@ radeon_link_encoder_connector(struct drm_device *dev)
                radeon_connector = to_radeon_connector(connector);
                list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
                        radeon_encoder = to_radeon_encoder(encoder);
-                       if (radeon_encoder->devices & radeon_connector->devices)
+                       if (radeon_encoder->devices & radeon_connector->devices) {
                                drm_mode_connector_attach_encoder(connector, encoder);
+                               if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) {
+                                       if (rdev->is_atom_bios)
+                                               radeon_atom_backlight_init(radeon_encoder, connector);
+                                       else
+                                               radeon_legacy_backlight_init(radeon_encoder, connector);
+                               }
+                       }
                }
        }
 }