[PATCH 05/12] drm/radeon: add backlight control for atom devices (v2)
Alex Hung
alex.hung at canonical.com
Tue Feb 5 19:06:26 UTC 2013
From: Alex Deucher <alexander.deucher at amd.com>
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 at amd.com>
---
drivers/gpu/drm/radeon/atombios_encoders.c | 231 ++++++++++++++++++++++++++++
drivers/gpu/drm/radeon/radeon_connectors.c | 15 --
drivers/gpu/drm/radeon/radeon_encoders.c | 18 ++-
3 files changed, 248 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index 6e8803a..f3645e1 100644
--- 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
--- 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
--- 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);
+ }
+ }
}
}
}
--
1.7.9.5
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