From ba3820ade317ee36e496b9b40d2ec3987dd4aef0 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Thu, 10 Mar 2011 14:02:12 +0100 Subject: drm/i915: Revive combination mode for backlight control This reverts commit 951f3512dba5bd44cda3e5ee22b4b522e4bb09fb drm/i915: Do not handle backlight combination mode specially since this commit introduced other regressions due to untouched LBPC register, e.g. the backlight dimmed after resume. In addition to the revert, this patch includes a fix for the original issue (weird backlight levels) by removing the wrong bit shift for computing the current backlight level. Also, including typo fixes (lpbc -> lbpc). Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=34524 Acked-by: Indan Zupancic Reviewed-by: Keith Packard Reviewed-by: Jesse Barnes Cc: Signed-off-by: Takashi Iwai Signed-off-by: Linus Torvalds --- drivers/gpu/drm/i915/intel_panel.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) (limited to 'drivers/gpu/drm/i915/intel_panel.c') diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index d860abeda70f..f8f86e57df22 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -30,6 +30,8 @@ #include "intel_drv.h" +#define PCI_LBPC 0xf4 /* legacy/combination backlight modes */ + void intel_fixed_panel_mode(struct drm_display_mode *fixed_mode, struct drm_display_mode *adjusted_mode) @@ -110,6 +112,19 @@ done: dev_priv->pch_pf_size = (width << 16) | height; } +static int is_backlight_combination_mode(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + + if (INTEL_INFO(dev)->gen >= 4) + return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE; + + if (IS_GEN2(dev)) + return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE; + + return 0; +} + static u32 i915_read_blc_pwm_ctl(struct drm_i915_private *dev_priv) { u32 val; @@ -166,6 +181,9 @@ u32 intel_panel_get_max_backlight(struct drm_device *dev) if (INTEL_INFO(dev)->gen < 4) max &= ~1; } + + if (is_backlight_combination_mode(dev)) + max *= 0xff; } DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max); @@ -183,6 +201,14 @@ u32 intel_panel_get_backlight(struct drm_device *dev) val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; if (IS_PINEVIEW(dev)) val >>= 1; + + if (is_backlight_combination_mode(dev)){ + u8 lbpc; + + val &= ~1; + pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc); + val *= lbpc; + } } DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val); @@ -205,6 +231,16 @@ void intel_panel_set_backlight(struct drm_device *dev, u32 level) if (HAS_PCH_SPLIT(dev)) return intel_pch_panel_set_backlight(dev, level); + + if (is_backlight_combination_mode(dev)){ + u32 max = intel_panel_get_max_backlight(dev); + u8 lbpc; + + lbpc = level * 0xfe / max + 1; + level /= lbpc; + pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc); + } + tmp = I915_READ(BLC_PWM_CTL); if (IS_PINEVIEW(dev)) { tmp &= ~(BACKLIGHT_DUTY_CYCLE_MASK - 1); -- cgit v1.2.2