From 1f90b1232773249d924868bec3c31525a69fd482 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Sat, 17 Sep 2022 22:59:16 +0200 Subject: drm/gma500: Refactor backlight support (v2) Refactor backlight support so that the gma_backlight_enable() / gma_backlight_disable() / gma_backlight_set() functions used by the Opregion handle will also work if no backlight_device gets registered. This is a preparation patch for not registering the gma500's own backlight device when acpi_video should be used, since registering 2 backlight devices for a single display really is undesirable. Since the acpi-video interface often uses the OpRegion we need to keep the OpRegion functional even when dev_priv->backlight_device is NULL. As a result of this refactor the actual backlight_device_register() call is moved to the shared backlight.c code and all #ifdefs related to CONFIG_BACKLIGHT_CLASS_DEVICE are now also limited to backlight.c . No functional changes intended. This has been tested on a Packard Bell Dot SC (Intel Atom N2600, cedarview) and a Sony Vaio vpc-x11s1e (Intel N540, poulsbo) laptop. Changes in v2: - Fix unused variable warnings when CONFIG_BACKLIGHT is not selected by marking the 2 variables as __maybe_unused. Signed-off-by: Hans de Goede Acked-by: Patrik Jakobsson Link: https://patchwork.freedesktop.org/patch/msgid/20220917205920.647212-2-hdegoede@redhat.com --- drivers/gpu/drm/gma500/backlight.c | 94 ++++++++++++++++++++------------ drivers/gpu/drm/gma500/cdv_device.c | 50 +++-------------- drivers/gpu/drm/gma500/oaktrail_device.c | 65 ++-------------------- drivers/gpu/drm/gma500/opregion.c | 6 +- drivers/gpu/drm/gma500/psb_device.c | 73 ++----------------------- drivers/gpu/drm/gma500/psb_drv.c | 13 +---- drivers/gpu/drm/gma500/psb_drv.h | 13 +++-- 7 files changed, 87 insertions(+), 227 deletions(-) diff --git a/drivers/gpu/drm/gma500/backlight.c b/drivers/gpu/drm/gma500/backlight.c index 46b9c0f13d6d..b804325eb64a 100644 --- a/drivers/gpu/drm/gma500/backlight.c +++ b/drivers/gpu/drm/gma500/backlight.c @@ -13,69 +13,95 @@ #include "intel_bios.h" #include "power.h" -#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE -static void do_gma_backlight_set(struct drm_device *dev) -{ - struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - backlight_update_status(dev_priv->backlight_device); -} -#endif - void gma_backlight_enable(struct drm_device *dev) { -#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE struct drm_psb_private *dev_priv = to_drm_psb_private(dev); + dev_priv->backlight_enabled = true; - if (dev_priv->backlight_device) { - dev_priv->backlight_device->props.brightness = dev_priv->backlight_level; - do_gma_backlight_set(dev); - } -#endif + dev_priv->ops->backlight_set(dev, dev_priv->backlight_level); } void gma_backlight_disable(struct drm_device *dev) { -#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE struct drm_psb_private *dev_priv = to_drm_psb_private(dev); + dev_priv->backlight_enabled = false; - if (dev_priv->backlight_device) { - dev_priv->backlight_device->props.brightness = 0; - do_gma_backlight_set(dev); - } -#endif + dev_priv->ops->backlight_set(dev, 0); } void gma_backlight_set(struct drm_device *dev, int v) { -#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE struct drm_psb_private *dev_priv = to_drm_psb_private(dev); + dev_priv->backlight_level = v; - if (dev_priv->backlight_device && dev_priv->backlight_enabled) { - dev_priv->backlight_device->props.brightness = v; - do_gma_backlight_set(dev); - } -#endif + if (dev_priv->backlight_enabled) + dev_priv->ops->backlight_set(dev, v); } +static int gma_backlight_get_brightness(struct backlight_device *bd) +{ + struct drm_device *dev = bl_get_data(bd); + struct drm_psb_private *dev_priv = to_drm_psb_private(dev); + + if (dev_priv->ops->backlight_get) + return dev_priv->ops->backlight_get(dev); + + return dev_priv->backlight_level; +} + +static int gma_backlight_update_status(struct backlight_device *bd) +{ + struct drm_device *dev = bl_get_data(bd); + int level = bd->props.brightness; + + /* Percentage 1-100% being valid */ + if (level < 1) + level = 1; + + gma_backlight_set(dev, level); + return 0; +} + +static const struct backlight_ops gma_backlight_ops __maybe_unused = { + .get_brightness = gma_backlight_get_brightness, + .update_status = gma_backlight_update_status, +}; + int gma_backlight_init(struct drm_device *dev) { -#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE struct drm_psb_private *dev_priv = to_drm_psb_private(dev); + struct backlight_properties props __maybe_unused = {}; + int ret; + dev_priv->backlight_enabled = true; - return dev_priv->ops->backlight_init(dev); -#else - return 0; + dev_priv->backlight_level = 100; + + ret = dev_priv->ops->backlight_init(dev); + if (ret) + return ret; + +#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE + props.brightness = dev_priv->backlight_level; + props.max_brightness = PSB_MAX_BRIGHTNESS; + props.type = BACKLIGHT_PLATFORM; + + dev_priv->backlight_device = + backlight_device_register(dev_priv->ops->backlight_name, + dev->dev, dev, + &gma_backlight_ops, &props); + if (IS_ERR(dev_priv->backlight_device)) + return PTR_ERR(dev_priv->backlight_device); #endif + + return 0; } void gma_backlight_exit(struct drm_device *dev) { #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - if (dev_priv->backlight_device) { - dev_priv->backlight_device->props.brightness = 0; - backlight_update_status(dev_priv->backlight_device); + + if (dev_priv->backlight_device) backlight_device_unregister(dev_priv->backlight_device); - } #endif } diff --git a/drivers/gpu/drm/gma500/cdv_device.c b/drivers/gpu/drm/gma500/cdv_device.c index ce96234f3df2..3065596257e9 100644 --- a/drivers/gpu/drm/gma500/cdv_device.c +++ b/drivers/gpu/drm/gma500/cdv_device.c @@ -5,7 +5,6 @@ * **************************************************************************/ -#include #include #include @@ -62,14 +61,10 @@ static int cdv_output_init(struct drm_device *dev) return 0; } -#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE - /* * Cedartrail Backlght Interfaces */ -static struct backlight_device *cdv_backlight_device; - static int cdv_backlight_combination_mode(struct drm_device *dev) { return REG_READ(BLC_PWM_CTL2) & PWM_LEGACY_MODE; @@ -92,9 +87,8 @@ static u32 cdv_get_max_backlight(struct drm_device *dev) return max; } -static int cdv_get_brightness(struct backlight_device *bd) +static int cdv_get_brightness(struct drm_device *dev) { - struct drm_device *dev = bl_get_data(bd); struct pci_dev *pdev = to_pci_dev(dev->dev); u32 val = REG_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; @@ -106,20 +100,13 @@ static int cdv_get_brightness(struct backlight_device *bd) val *= lbpc; } return (val * 100)/cdv_get_max_backlight(dev); - } -static int cdv_set_brightness(struct backlight_device *bd) +static void cdv_set_brightness(struct drm_device *dev, int level) { - struct drm_device *dev = bl_get_data(bd); struct pci_dev *pdev = to_pci_dev(dev->dev); - int level = bd->props.brightness; u32 blc_pwm_ctl; - /* Percentage 1-100% being valid */ - if (level < 1) - level = 1; - level *= cdv_get_max_backlight(dev); level /= 100; @@ -136,38 +123,18 @@ static int cdv_set_brightness(struct backlight_device *bd) blc_pwm_ctl = REG_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK; REG_WRITE(BLC_PWM_CTL, (blc_pwm_ctl | (level << BACKLIGHT_DUTY_CYCLE_SHIFT))); - return 0; } -static const struct backlight_ops cdv_ops = { - .get_brightness = cdv_get_brightness, - .update_status = cdv_set_brightness, -}; - static int cdv_backlight_init(struct drm_device *dev) { struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - struct backlight_properties props; - - memset(&props, 0, sizeof(struct backlight_properties)); - props.max_brightness = 100; - props.type = BACKLIGHT_PLATFORM; - - cdv_backlight_device = backlight_device_register("psb-bl", - NULL, (void *)dev, &cdv_ops, &props); - if (IS_ERR(cdv_backlight_device)) - return PTR_ERR(cdv_backlight_device); - - cdv_backlight_device->props.brightness = - cdv_get_brightness(cdv_backlight_device); - backlight_update_status(cdv_backlight_device); - dev_priv->backlight_device = cdv_backlight_device; - dev_priv->backlight_enabled = true; + + dev_priv->backlight_level = cdv_get_brightness(dev); + cdv_set_brightness(dev, dev_priv->backlight_level); + return 0; } -#endif - /* * Provide the Cedarview specific chip logic and low level methods * for power management @@ -613,9 +580,10 @@ const struct psb_ops cdv_chip_ops = { .hotplug = cdv_hotplug_event, .hotplug_enable = cdv_hotplug_enable, -#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE .backlight_init = cdv_backlight_init, -#endif + .backlight_get = cdv_get_brightness, + .backlight_set = cdv_set_brightness, + .backlight_name = "psb-bl", .init_pm = cdv_init_pm, .save_regs = cdv_save_display_registers, diff --git a/drivers/gpu/drm/gma500/oaktrail_device.c b/drivers/gpu/drm/gma500/oaktrail_device.c index f90e628cb482..2531959d3d77 100644 --- a/drivers/gpu/drm/gma500/oaktrail_device.c +++ b/drivers/gpu/drm/gma500/oaktrail_device.c @@ -5,7 +5,6 @@ * **************************************************************************/ -#include #include #include #include @@ -37,29 +36,18 @@ static int oaktrail_output_init(struct drm_device *dev) * Provide the low level interfaces for the Moorestown backlight */ -#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE - #define MRST_BLC_MAX_PWM_REG_FREQ 0xFFFF #define BLC_PWM_PRECISION_FACTOR 100 /* 10000000 */ #define BLC_PWM_FREQ_CALC_CONSTANT 32 #define MHz 1000000 #define BLC_ADJUSTMENT_MAX 100 -static struct backlight_device *oaktrail_backlight_device; -static int oaktrail_brightness; - -static int oaktrail_set_brightness(struct backlight_device *bd) +static void oaktrail_set_brightness(struct drm_device *dev, int level) { - struct drm_device *dev = bl_get_data(oaktrail_backlight_device); struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - int level = bd->props.brightness; u32 blc_pwm_ctl; u32 max_pwm_blc; - /* Percentage 1-100% being valid */ - if (level < 1) - level = 1; - if (gma_power_begin(dev, 0)) { /* Calculate and set the brightness value */ max_pwm_blc = REG_READ(BLC_PWM_CTL) >> 16; @@ -82,19 +70,9 @@ static int oaktrail_set_brightness(struct backlight_device *bd) REG_WRITE(BLC_PWM_CTL, (max_pwm_blc << 16) | blc_pwm_ctl); gma_power_end(dev); } - oaktrail_brightness = level; - return 0; -} - -static int oaktrail_get_brightness(struct backlight_device *bd) -{ - /* return locally cached var instead of HW read (due to DPST etc.) */ - /* FIXME: ideally return actual value in case firmware fiddled with - it */ - return oaktrail_brightness; } -static int device_backlight_init(struct drm_device *dev) +static int oaktrail_backlight_init(struct drm_device *dev) { struct drm_psb_private *dev_priv = to_drm_psb_private(dev); unsigned long core_clock; @@ -123,44 +101,11 @@ static int device_backlight_init(struct drm_device *dev) REG_WRITE(BLC_PWM_CTL, value | (value << 16)); gma_power_end(dev); } - return 0; -} - -static const struct backlight_ops oaktrail_ops = { - .get_brightness = oaktrail_get_brightness, - .update_status = oaktrail_set_brightness, -}; -static int oaktrail_backlight_init(struct drm_device *dev) -{ - struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - int ret; - struct backlight_properties props; - - memset(&props, 0, sizeof(struct backlight_properties)); - props.max_brightness = 100; - props.type = BACKLIGHT_PLATFORM; - - oaktrail_backlight_device = backlight_device_register("oaktrail-bl", - NULL, (void *)dev, &oaktrail_ops, &props); - - if (IS_ERR(oaktrail_backlight_device)) - return PTR_ERR(oaktrail_backlight_device); - - ret = device_backlight_init(dev); - if (ret < 0) { - backlight_device_unregister(oaktrail_backlight_device); - return ret; - } - oaktrail_backlight_device->props.brightness = 100; - oaktrail_backlight_device->props.max_brightness = 100; - backlight_update_status(oaktrail_backlight_device); - dev_priv->backlight_device = oaktrail_backlight_device; + oaktrail_set_brightness(dev, PSB_MAX_BRIGHTNESS); return 0; } -#endif - /* * Provide the Moorestown specific chip logic and low level methods * for power management @@ -545,9 +490,9 @@ const struct psb_ops oaktrail_chip_ops = { .output_init = oaktrail_output_init, -#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE .backlight_init = oaktrail_backlight_init, -#endif + .backlight_set = oaktrail_set_brightness, + .backlight_name = "oaktrail-bl", .save_regs = oaktrail_save_display_registers, .restore_regs = oaktrail_restore_display_registers, diff --git a/drivers/gpu/drm/gma500/opregion.c b/drivers/gpu/drm/gma500/opregion.c index dc494df71a48..0c271072af63 100644 --- a/drivers/gpu/drm/gma500/opregion.c +++ b/drivers/gpu/drm/gma500/opregion.c @@ -150,21 +150,17 @@ static u32 asle_set_backlight(struct drm_device *dev, u32 bclp) { struct drm_psb_private *dev_priv = to_drm_psb_private(dev); struct opregion_asle *asle = dev_priv->opregion.asle; - struct backlight_device *bd = dev_priv->backlight_device; DRM_DEBUG_DRIVER("asle set backlight %x\n", bclp); if (!(bclp & ASLE_BCLP_VALID)) return ASLE_BACKLIGHT_FAILED; - if (bd == NULL) - return ASLE_BACKLIGHT_FAILED; - bclp &= ASLE_BCLP_MSK; if (bclp > 255) return ASLE_BACKLIGHT_FAILED; - gma_backlight_set(dev, bclp * bd->props.max_brightness / 255); + gma_backlight_set(dev, bclp * PSB_MAX_BRIGHTNESS / 255); asle->cblv = (bclp * 0x64) / 0xff | ASLE_CBLV_VALID; diff --git a/drivers/gpu/drm/gma500/psb_device.c b/drivers/gpu/drm/gma500/psb_device.c index 71534f4ca834..3c294c38bdb4 100644 --- a/drivers/gpu/drm/gma500/psb_device.c +++ b/drivers/gpu/drm/gma500/psb_device.c @@ -5,8 +5,6 @@ * **************************************************************************/ -#include - #include #include "gma_device.h" @@ -24,8 +22,6 @@ static int psb_output_init(struct drm_device *dev) return 0; } -#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE - /* * Poulsbo Backlight Interfaces */ @@ -41,18 +37,6 @@ static int psb_output_init(struct drm_device *dev) #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE) #define PSB_BACKLIGHT_PWM_CTL_SHIFT (16) -static int psb_brightness; -static struct backlight_device *psb_backlight_device; - -static int psb_get_brightness(struct backlight_device *bd) -{ - /* return locally cached var instead of HW read (due to DPST etc.) */ - /* FIXME: ideally return actual value in case firmware fiddled with - it */ - return psb_brightness; -} - - static int psb_backlight_setup(struct drm_device *dev) { struct drm_psb_private *dev_priv = to_drm_psb_private(dev); @@ -86,62 +70,13 @@ static int psb_backlight_setup(struct drm_device *dev) REG_WRITE(BLC_PWM_CTL, (value << PSB_BACKLIGHT_PWM_CTL_SHIFT) | (value)); } - return 0; -} - -static int psb_set_brightness(struct backlight_device *bd) -{ - struct drm_device *dev = bl_get_data(psb_backlight_device); - int level = bd->props.brightness; - - /* Percentage 1-100% being valid */ - if (level < 1) - level = 1; - - psb_intel_lvds_set_brightness(dev, level); - psb_brightness = level; - return 0; -} - -static const struct backlight_ops psb_ops = { - .get_brightness = psb_get_brightness, - .update_status = psb_set_brightness, -}; - -static int psb_backlight_init(struct drm_device *dev) -{ - struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - int ret; - struct backlight_properties props; - - memset(&props, 0, sizeof(struct backlight_properties)); - props.max_brightness = 100; - props.type = BACKLIGHT_PLATFORM; - - psb_backlight_device = backlight_device_register("psb-bl", - NULL, (void *)dev, &psb_ops, &props); - if (IS_ERR(psb_backlight_device)) - return PTR_ERR(psb_backlight_device); - - ret = psb_backlight_setup(dev); - if (ret < 0) { - backlight_device_unregister(psb_backlight_device); - psb_backlight_device = NULL; - return ret; - } - psb_backlight_device->props.brightness = 100; - psb_backlight_device->props.max_brightness = 100; - backlight_update_status(psb_backlight_device); - dev_priv->backlight_device = psb_backlight_device; + psb_intel_lvds_set_brightness(dev, PSB_MAX_BRIGHTNESS); /* This must occur after the backlight is properly initialised */ psb_lid_timer_init(dev_priv); - return 0; } -#endif - /* * Provide the Poulsbo specific chip logic and low level methods * for power management @@ -345,9 +280,9 @@ const struct psb_ops psb_chip_ops = { .output_init = psb_output_init, -#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE - .backlight_init = psb_backlight_init, -#endif + .backlight_init = psb_backlight_setup, + .backlight_set = psb_intel_lvds_set_brightness, + .backlight_name = "psb-bl", .init_pm = psb_init_pm, .save_regs = psb_save_display_registers, diff --git a/drivers/gpu/drm/gma500/psb_drv.c b/drivers/gpu/drm/gma500/psb_drv.c index 9168bc620628..d3dc16193a29 100644 --- a/drivers/gpu/drm/gma500/psb_drv.c +++ b/drivers/gpu/drm/gma500/psb_drv.c @@ -169,8 +169,7 @@ static void psb_driver_unload(struct drm_device *dev) /* TODO: Kill vblank etc here */ - if (dev_priv->backlight_device) - gma_backlight_exit(dev); + gma_backlight_exit(dev); psb_modeset_cleanup(dev); gma_irq_uninstall(dev); @@ -415,16 +414,6 @@ out_err: return ret; } -static inline void get_brightness(struct backlight_device *bd) -{ -#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE - if (bd) { - bd->props.brightness = bd->ops->get_brightness(bd); - backlight_update_status(bd); - } -#endif -} - static int psb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { struct drm_psb_private *dev_priv; diff --git a/drivers/gpu/drm/gma500/psb_drv.h b/drivers/gpu/drm/gma500/psb_drv.h index 049701ce8a5f..ae544b69fc47 100644 --- a/drivers/gpu/drm/gma500/psb_drv.h +++ b/drivers/gpu/drm/gma500/psb_drv.h @@ -172,6 +172,8 @@ #define PSB_WATCHDOG_DELAY (HZ * 2) #define PSB_LID_DELAY (HZ / 10) +#define PSB_MAX_BRIGHTNESS 100 + #define PSB_PWR_STATE_ON 1 #define PSB_PWR_STATE_OFF 2 @@ -522,10 +524,6 @@ struct drm_psb_private { struct drm_fb_helper *fb_helper; - /* Panel brightness */ - int brightness; - int brightness_adjusted; - bool dsr_enable; u32 dsr_fb_update; bool dpi_panel_on[3]; @@ -594,10 +592,13 @@ struct psb_ops { void (*disable_sr)(struct drm_device *dev); void (*lvds_bl_power)(struct drm_device *dev, bool on); -#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE + /* Backlight */ int (*backlight_init)(struct drm_device *dev); -#endif + void (*backlight_set)(struct drm_device *dev, int level); + int (*backlight_get)(struct drm_device *dev); + const char *backlight_name; + int i2c_bus; /* I2C bus identifier for Moorestown */ }; -- cgit v1.2.3