From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Garrett Subject: [PATCH] radeon: Expose backlight class device for legacy LVDS encoder Date: Wed, 8 Sep 2010 12:32:19 -0400 Message-ID: <1283963539-4039-3-git-send-email-mjg@redhat.com> References: <1283963539-4039-1-git-send-email-mjg@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <1283963539-4039-1-git-send-email-mjg@redhat.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org Cc: =?UTF-8?q?Michel=20D=C3=A4nzer?= , =?UTF-8?q?Michel=20D=C3=A4nzer?= , Matthew Garrett , dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org =46rom: Michel D=C3=A4nzer Allows e.g. power management daemons to control the backlight level. In= spired by the corresponding code in radeonfb. (Updated to add backlight type and make the connector the parent device= - mjg) Signed-off-by: Michel D=C3=A4nzer Signed-off-by: Matthew Garrett Cc: dri-devel@lists.freedesktop.org --- drivers/gpu/drm/radeon/Kconfig | 1 + drivers/gpu/drm/radeon/radeon_legacy_encoders.c | 257 +++++++++++++++= +++++++- drivers/gpu/drm/radeon/radeon_mode.h | 10 + 3 files changed, 262 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/radeon/Kconfig b/drivers/gpu/drm/radeon/Kc= onfig index 1c02d23..9746fee 100644 --- a/drivers/gpu/drm/radeon/Kconfig +++ b/drivers/gpu/drm/radeon/Kconfig @@ -1,6 +1,7 @@ config DRM_RADEON_KMS bool "Enable modesetting on radeon by default - NEW DRIVER" depends on DRM_RADEON + select BACKLIGHT_CLASS_DEVICE help Choose this option if you want kernel modesetting enabled by defaul= t. =20 diff --git a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c b/drivers/= gpu/drm/radeon/radeon_legacy_encoders.c index 0b83970..e873935 100644 --- a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c +++ b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c @@ -28,6 +28,7 @@ #include "radeon_drm.h" #include "radeon.h" #include "atom.h" +#include =20 static void radeon_legacy_encoder_disable(struct drm_encoder *encoder) { @@ -39,7 +40,7 @@ static void radeon_legacy_encoder_disable(struct drm_= encoder *encoder) radeon_encoder->active_device =3D 0; } =20 -static void radeon_legacy_lvds_dpms(struct drm_encoder *encoder, int m= ode) +static void radeon_legacy_lvds_update(struct drm_encoder *encoder, int= mode) { struct drm_device *dev =3D encoder->dev; struct radeon_device *rdev =3D dev->dev_private; @@ -47,15 +48,23 @@ static void radeon_legacy_lvds_dpms(struct drm_enco= der *encoder, int mode) uint32_t lvds_gen_cntl, lvds_pll_cntl, pixclks_cntl, disp_pwr_man; int panel_pwr_delay =3D 2000; bool is_mac =3D false; + uint8_t backlight_level; DRM_DEBUG_KMS("\n"); =20 + lvds_gen_cntl =3D RREG32(RADEON_LVDS_GEN_CNTL); + backlight_level =3D (lvds_gen_cntl >> RADEON_LVDS_BL_MOD_LEVEL_SHIFT)= & 0xff; + if (radeon_encoder->enc_priv) { if (rdev->is_atom_bios) { struct radeon_encoder_atom_dig *lvds =3D radeon_encoder->enc_priv; panel_pwr_delay =3D lvds->panel_pwr_delay; + if (lvds->bl_dev) + backlight_level =3D lvds->backlight_level; } else { struct radeon_encoder_lvds *lvds =3D radeon_encoder->enc_priv; panel_pwr_delay =3D lvds->panel_pwr_delay; + if (lvds->bl_dev) + backlight_level =3D lvds->backlight_level; } } =20 @@ -82,11 +91,13 @@ static void radeon_legacy_lvds_dpms(struct drm_enco= der *encoder, int mode) lvds_pll_cntl &=3D ~RADEON_LVDS_PLL_RESET; WREG32(RADEON_LVDS_PLL_CNTL, lvds_pll_cntl); =20 - lvds_gen_cntl =3D RREG32(RADEON_LVDS_GEN_CNTL); - lvds_gen_cntl |=3D (RADEON_LVDS_ON | RADEON_LVDS_EN | RADEON_LVDS_DI= GON | RADEON_LVDS_BLON); + lvds_gen_cntl &=3D ~(RADEON_LVDS_DISPLAY_DIS | + RADEON_LVDS_BL_MOD_LEVEL_MASK); + lvds_gen_cntl |=3D (RADEON_LVDS_ON | RADEON_LVDS_EN | + RADEON_LVDS_DIGON | RADEON_LVDS_BLON | + (backlight_level << RADEON_LVDS_BL_MOD_LEVEL_SHIFT)); if (is_mac) lvds_gen_cntl |=3D RADEON_LVDS_BL_MOD_EN; - lvds_gen_cntl &=3D ~(RADEON_LVDS_DISPLAY_DIS); udelay(panel_pwr_delay * 1000); WREG32(RADEON_LVDS_GEN_CNTL, lvds_gen_cntl); break; @@ -95,7 +106,6 @@ static void radeon_legacy_lvds_dpms(struct drm_encod= er *encoder, int mode) case DRM_MODE_DPMS_OFF: pixclks_cntl =3D RREG32_PLL(RADEON_PIXCLKS_CNTL); WREG32_PLL_P(RADEON_PIXCLKS_CNTL, 0, ~RADEON_PIXCLK_LVDS_ALWAYS_ONb)= ; - lvds_gen_cntl =3D RREG32(RADEON_LVDS_GEN_CNTL); lvds_gen_cntl |=3D RADEON_LVDS_DISPLAY_DIS; if (is_mac) { lvds_gen_cntl &=3D ~RADEON_LVDS_BL_MOD_EN; @@ -119,6 +129,25 @@ static void radeon_legacy_lvds_dpms(struct drm_enc= oder *encoder, int mode) =20 } =20 +static void radeon_legacy_lvds_dpms(struct drm_encoder *encoder, int m= ode) +{ + struct radeon_device *rdev =3D encoder->dev->dev_private; + struct radeon_encoder *radeon_encoder =3D to_radeon_encoder(encoder); + DRM_DEBUG("\n"); + + if (radeon_encoder->enc_priv) { + if (rdev->is_atom_bios) { + struct radeon_encoder_atom_dig *lvds =3D radeon_encoder->enc_priv; + lvds->dpms_mode =3D mode; + } else { + struct radeon_encoder_lvds *lvds =3D radeon_encoder->enc_priv; + lvds->dpms_mode =3D mode; + } + } + + radeon_legacy_lvds_update(encoder, mode); +} + static void radeon_legacy_lvds_prepare(struct drm_encoder *encoder) { struct radeon_device *rdev =3D encoder->dev->dev_private; @@ -237,9 +266,224 @@ static const struct drm_encoder_helper_funcs rade= on_legacy_lvds_helper_funcs =3D { .disable =3D radeon_legacy_encoder_disable, }; =20 +#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE + +#define MAX_RADEON_LEVEL 0xFF + +struct radeon_backlight_privdata { + struct radeon_encoder *encoder; + uint8_t negative; +}; + +static uint8_t radeon_legacy_lvds_level(struct backlight_device *bd) +{ + struct radeon_backlight_privdata *pdata =3D bl_get_data(bd); + uint8_t level; + + /* Convert brightness to hardware level */ + if (bd->props.brightness < 0) + level =3D 0; + else if (bd->props.brightness > MAX_RADEON_LEVEL) + level =3D MAX_RADEON_LEVEL; + else + level =3D bd->props.brightness; + + if (pdata->negative) + level =3D MAX_RADEON_LEVEL - level; + + return level; +} + +static int radeon_legacy_backlight_update_status(struct backlight_devi= ce *bd) +{ + struct radeon_backlight_privdata *pdata =3D bl_get_data(bd); + struct radeon_encoder *radeon_encoder =3D pdata->encoder; + struct drm_device *dev =3D radeon_encoder->base.dev; + struct radeon_device *rdev =3D dev->dev_private; + int dpms_mode =3D DRM_MODE_DPMS_ON; + + if (radeon_encoder->enc_priv) { + if (rdev->is_atom_bios) { + struct radeon_encoder_atom_dig *lvds =3D radeon_encoder->enc_priv; + dpms_mode =3D lvds->dpms_mode; + lvds->backlight_level =3D radeon_legacy_lvds_level(bd); + } else { + struct radeon_encoder_lvds *lvds =3D radeon_encoder->enc_priv; + dpms_mode =3D lvds->dpms_mode; + lvds->backlight_level =3D radeon_legacy_lvds_level(bd); + } + } + + if (bd->props.brightness > 0) + radeon_legacy_lvds_update(&radeon_encoder->base, dpms_mode); + else + radeon_legacy_lvds_update(&radeon_encoder->base, DRM_MODE_DPMS_OFF); + + return 0; +} + +static int radeon_legacy_backlight_get_brightness(struct backlight_dev= ice *bd) +{ + struct radeon_backlight_privdata *pdata =3D bl_get_data(bd); + struct radeon_encoder *radeon_encoder =3D pdata->encoder; + struct drm_device *dev =3D radeon_encoder->base.dev; + struct radeon_device *rdev =3D dev->dev_private; + uint8_t backlight_level; + + backlight_level =3D (RREG32(RADEON_LVDS_GEN_CNTL) >> + RADEON_LVDS_BL_MOD_LEVEL_SHIFT) & 0xff; + + return pdata->negative ? MAX_RADEON_LEVEL - backlight_level : backlig= ht_level; +} + +static const struct backlight_ops radeon_backlight_ops =3D { + .get_brightness =3D radeon_legacy_backlight_get_brightness, + .update_status =3D radeon_legacy_backlight_update_status, +}; + +static void radeon_legacy_backlight_init(struct radeon_encoder *radeon= _encoder) +{ + struct drm_device *dev =3D radeon_encoder->base.dev; + struct radeon_device *rdev =3D dev->dev_private; + struct backlight_device *bd; + struct backlight_properties props; + struct radeon_backlight_privdata *pdata; + struct drm_connector *connector; + uint8_t backlight_level; + + if (!radeon_encoder->enc_priv) + return; + +#ifdef CONFIG_PMAC_BACKLIGHT + if (!pmac_has_backlight_type("ati") && + !pmac_has_backlight_type("mnca")) + return; +#endif + + pdata =3D kmalloc(sizeof(struct radeon_backlight_privdata), GFP_KERNE= L); + if (!pdata) { + DRM_ERROR("Memory allocation failed\n"); + goto error; + } + + connector =3D radeon_get_connector_for_encoder(&radeon_encoder->base)= ; + + props.max_brightness =3D MAX_RADEON_LEVEL; + props.type =3D BACKLIGHT_RAW; + bd =3D backlight_device_register("radeon_backlight", &connector->kdev= , + pdata, &radeon_backlight_ops, &props); + if (IS_ERR(bd)) { + DRM_ERROR("Backlight registration failed\n"); + goto error; + } + + pdata->encoder =3D radeon_encoder; + + backlight_level =3D (RREG32(RADEON_LVDS_GEN_CNTL) >> + RADEON_LVDS_BL_MOD_LEVEL_SHIFT) & 0xff; + + /* First, try to detect backlight level sense based on the assumption + * that firmware set it up at full brightness + */ + if (backlight_level =3D=3D 0) + pdata->negative =3D true; + else if (backlight_level =3D=3D 0xff) + pdata->negative =3D false; + else { + /* XXX hack... maybe some day we can figure out in what direction + * backlight should work on a given panel? + */ + pdata->negative =3D (rdev->family !=3D CHIP_RV200 && + rdev->family !=3D CHIP_RV250 && + rdev->family !=3D CHIP_RV280 && + rdev->family !=3D CHIP_RV350); + +#ifdef CONFIG_PMAC_BACKLIGHT + pdata->negative =3D (pdata->negative || + machine_is_compatible("PowerBook4,3") || + machine_is_compatible("PowerBook6,3") || + machine_is_compatible("PowerBook6,5")); +#endif + } + + if (rdev->is_atom_bios) { + struct radeon_encoder_atom_dig *lvds =3D radeon_encoder->enc_priv; + lvds->bl_dev =3D bd; + } else { + struct radeon_encoder_lvds *lvds =3D radeon_encoder->enc_priv; + lvds->bl_dev =3D bd; + } + + bd->props.brightness =3D radeon_legacy_backlight_get_brightness(bd); + bd->props.power =3D FB_BLANK_UNBLANK; + backlight_update_status(bd); + + DRM_INFO("radeon legacy LVDS backlight initialized\n"); + + return; + +error: + kfree(pdata); + return; +} + +static void radeon_legacy_backlight_exit(struct radeon_encoder *radeon= _encoder) +{ + struct drm_device *dev =3D radeon_encoder->base.dev; + struct radeon_device *rdev =3D dev->dev_private; + struct backlight_device *bd =3D NULL; + + if (!radeon_encoder->enc_priv) + return; + + if (rdev->is_atom_bios) { + struct radeon_encoder_atom_dig *lvds =3D radeon_encoder->enc_priv; + bd =3D lvds->bl_dev; + lvds->bl_dev =3D NULL; + } else { + struct radeon_encoder_lvds *lvds =3D radeon_encoder->enc_priv; + bd =3D lvds->bl_dev; + lvds->bl_dev =3D NULL; + } + + if (bd) { + struct radeon_legacy_backlight_privdata *pdata; + + pdata =3D bl_get_data(bd); + backlight_device_unregister(bd); + kfree(pdata); + + DRM_INFO("radeon legacy LVDS backlight unloaded\n"); + } +} + +#else /* !CONFIG_BACKLIGHT_CLASS_DEVICE */ + +static void radeon_legacy_backlight_init(struct radeon_encoder *encode= r) +{ +} + +static void radeon_legacy_backlight_exit(struct radeon_encoder *encode= r) +{ +} + +#endif + + +static void radeon_lvds_enc_destroy(struct drm_encoder *encoder) +{ + struct radeon_encoder *radeon_encoder =3D to_radeon_encoder(encoder); + + if (radeon_encoder->enc_priv) { + radeon_legacy_backlight_exit(radeon_encoder); + kfree(radeon_encoder->enc_priv); + } + drm_encoder_cleanup(encoder); + kfree(radeon_encoder); +} =20 static const struct drm_encoder_funcs radeon_legacy_lvds_enc_funcs =3D= { - .destroy =3D radeon_enc_destroy, + .destroy =3D radeon_lvds_enc_destroy, }; =20 static void radeon_legacy_primary_dac_dpms(struct drm_encoder *encoder= , int mode) @@ -1389,6 +1633,7 @@ radeon_add_legacy_encoder(struct drm_device *dev,= uint32_t encoder_enum, uint32_ else radeon_encoder->enc_priv =3D radeon_combios_get_lvds_info(radeon_en= coder); radeon_encoder->rmx_type =3D RMX_FULL; + radeon_legacy_backlight_init(radeon_encoder); break; case ENCODER_OBJECT_ID_INTERNAL_TMDS1: drm_encoder_init(dev, encoder, &radeon_legacy_tmds_int_enc_funcs, DR= M_MODE_ENCODER_TMDS); diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/rad= eon/radeon_mode.h index efbe975..dc5f51c 100644 --- a/drivers/gpu/drm/radeon/radeon_mode.h +++ b/drivers/gpu/drm/radeon/radeon_mode.h @@ -302,6 +302,11 @@ struct radeon_encoder_lvds { uint32_t lvds_gen_cntl; /* panel mode */ struct drm_display_mode native_mode; +#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE + struct backlight_device *bl_dev; + int dpms_mode; + uint8_t backlight_level; +#endif }; =20 struct radeon_encoder_tv_dac { @@ -353,6 +358,11 @@ struct radeon_encoder_atom_dig { struct radeon_atom_ss *ss; /* panel mode */ struct drm_display_mode native_mode; +#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE + struct backlight_device *bl_dev; + int dpms_mode; + uint8_t backlight_level; +#endif }; =20 struct radeon_encoder_atom_dac { --=20 1.7.2.1