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authorJani Nikula <jani.nikula@intel.com>2016-09-19 10:35:25 (GMT)
committerJani Nikula <jani.nikula@intel.com>2016-10-10 13:04:59 (GMT)
commit16e1203db8ab740c912ea62761fdf27d7811b886 (patch)
treeb2a6ff1ef385ffc0115681adb2d55f98a8d8d393
parentb89857852656f016328d2d7ccec5fff57445fa85 (diff)
downloadlinux-16e1203db8ab740c912ea62761fdf27d7811b886.tar.xz
drm/i915/backlight: setup and cache pwm alternate increment value
This will also be needed later on when setting up the alternate increment in backlight enable. Cc: Shawn Lee <shawn.c.lee@intel.com> Cc: <stable@vger.kernel.org> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/9984b20bc59aee90b83caf59ce91f3fb122c9627.1474281249.git.jani.nikula@intel.com (cherry picked from commit 32b421e79e6b546da1d469f1229403ac9142d695) Signed-off-by: Jani Nikula <jani.nikula@intel.com>
-rw-r--r--drivers/gpu/drm/i915/intel_drv.h1
-rw-r--r--drivers/gpu/drm/i915/intel_panel.c14
2 files changed, 12 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 8fd16ad..c3e65e5 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -263,6 +263,7 @@ struct intel_panel {
bool enabled;
bool combination_mode; /* gen 2/4 only */
bool active_low_pwm;
+ bool alternate_pwm_increment; /* lpt+ */
/* PWM chip */
bool util_pin_active_low; /* bxt+ */
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index c10e9b0..8bc4320 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -1242,10 +1242,10 @@ static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
*/
static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
u32 mul;
- if (I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY)
+ if (panel->backlight.alternate_pwm_increment)
mul = 128;
else
mul = 16;
@@ -1261,9 +1261,10 @@ static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
u32 mul, clock;
- if (I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY)
+ if (panel->backlight.alternate_pwm_increment)
mul = 16;
else
mul = 128;
@@ -1414,6 +1415,13 @@ static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unus
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 pch_ctl1, pch_ctl2, val;
+ bool alt;
+
+ if (HAS_PCH_LPT(dev_priv))
+ alt = I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
+ else
+ alt = I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
+ panel->backlight.alternate_pwm_increment = alt;
pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;