From 83d83392e3e5432a9240e6b060119f01d27f2a30 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Mon, 30 Nov 2015 16:23:43 +0200 Subject: [PATCH] drm/i915: Fix vbt PWM max setup for CTG MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit CTG uses hrawclk for backlight, so calculate the max based on that instead of cdclk. Fixes: aa17cdb4f836 ("drm/i915: initialize backlight max from VBT") Signed-off-by: Ville Syrjälä Link: http://patchwork.freedesktop.org/patch/msgid/1448893432-6978-3-git-send-email-ville.syrjala@linux.intel.com Reviewed-by: Jani Nikula --- drivers/gpu/drm/i915/intel_panel.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index c3d3bba97651..d4beac3c19a4 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -1352,13 +1352,19 @@ static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz) /* * Gen4: This value represents the period of the PWM stream in display core - * clocks multiplied by 128. + * clocks ([DevCTG] HRAW clocks) multiplied by 128. + * */ static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz) { struct drm_device *dev = connector->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; - int clock = 1000 * dev_priv->display.get_display_clock_speed(dev); + int clock; + + if (IS_G4X(dev_priv)) + clock = MHz(intel_hrawclk(dev)); + else + clock = 1000 * dev_priv->display.get_display_clock_speed(dev); return clock / (pwm_freq_hz * 128); } -- 2.20.1