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drm/i915/backlight: setup and cache pwm alternate increment value

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This will also be needed later on when setting up the alternate
increment in backlight enable.

Cc: Shawn Lee <shawn.c.lee@intel.com>
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
This commit is contained in:
Jani Nikula 2016-09-19 13:35:25 +03:00
parent 8e4f768c43
commit 32b421e79e
2 changed files with 12 additions and 3 deletions
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1
drivers/gpu/drm/i915/intel_drv.h
View File

@ -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+ */

14
drivers/gpu/drm/i915/intel_panel.c
View File

@ -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;