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drm/i915/cnp: Backlight support for CNP. 

Split out BXT and CNP's setup_backlight(),enable_backlight(),
disable_backlight() and hz_to_pwm() into
two separate functions instead of reusing BXT function.

Reuse set_backlight() and get_backlight() since they have
no reference to the utility pin.

v2: Reuse BXT functions with controller 0 instead of
    redefining it. (Jani).
    Use dev_priv->rawclk_freq instead of getting the value
    from SFUSE_STRAP.
v3: Avoid setup backligh controller along with hooks and
    fully reuse hooks setup as suggested by Jani.
v4: Clean up commit message.
v5: Implement per PCH instead per platform.

v6: Introduce a new function for CNP.(Jani and Ville)

v7: Squash the all CNP Backlight support patches into a
single patch. (Jani)

v8: Correct indentation, remove unneeded blank lines and
correct mail address (Jani).

v9: Remove unused enum pipe. (by CI)

v10: Remove comment mentioning SFUSE_STRAP in a part of
     the code that we don't use it. (Jani)
     Make controller = 0 since current CNP has only one
     controller and put a comment mentioning why we
     reuse the BXT definitions and are keeping the
     controller = 0. (DK)
v11: Remove spurious line. (DK)

Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Ville Syrjala <ville.syrjala@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1496434004-29812-4-git-send-email-rodrigo.vivi@intel.com
This commit is contained in:
Rodrigo Vivi 2017-06-02 13:06:42 -07:00
parent 9d81a99713
commit 4c9f7086ac
1 changed files with 96 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

96
drivers/gpu/drm/i915/intel_panel.c
View File

@ -796,6 +796,19 @@ static void bxt_disable_backlight(struct intel_connector *connector)
}
}
static void cnp_disable_backlight(struct intel_connector *connector)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 tmp;
intel_panel_actually_set_backlight(connector, 0);
tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
tmp & ~BXT_BLC_PWM_ENABLE);
}
static void pwm_disable_backlight(struct intel_connector *connector)
{
struct intel_panel *panel = &connector->panel;
@ -1086,6 +1099,35 @@ static void bxt_enable_backlight(struct intel_connector *connector)
pwm_ctl | BXT_BLC_PWM_ENABLE);
}
static void cnp_enable_backlight(struct intel_connector *connector)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 pwm_ctl;
pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
DRM_DEBUG_KMS("backlight already enabled\n");
pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
pwm_ctl);
}
I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
panel->backlight.max);
intel_panel_actually_set_backlight(connector, panel->backlight.level);
pwm_ctl = 0;
if (panel->backlight.active_low_pwm)
pwm_ctl |= BXT_BLC_PWM_POLARITY;
I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
pwm_ctl | BXT_BLC_PWM_ENABLE);
}
static void pwm_enable_backlight(struct intel_connector *connector)
{
struct intel_panel *panel = &connector->panel;
@ -1249,6 +1291,17 @@ void intel_backlight_device_unregister(struct intel_connector *connector)
}
#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
/*
* CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
* PWM increment = 1
*/
static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
}
/*
* BXT: PWM clock frequency = 19.2 MHz.
*/
@ -1644,6 +1697,42 @@ bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
return 0;
}
static int
cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 pwm_ctl, val;
/*
* CNP has the BXT implementation of backlight, but with only
* one controller. Future platforms could have multiple controllers
* so let's make this extensible and prepared for the future.
*/
panel->backlight.controller = 0;
pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
panel->backlight.max =
I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
if (!panel->backlight.max)
panel->backlight.max = get_backlight_max_vbt(connector);
if (!panel->backlight.max)
return -ENODEV;
val = bxt_get_backlight(connector);
val = intel_panel_compute_brightness(connector, val);
panel->backlight.level = clamp(val, panel->backlight.min,
panel->backlight.max);
panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
return 0;
}
static int pwm_setup_backlight(struct intel_connector *connector,
enum pipe pipe)
{
@ -1760,6 +1849,13 @@ intel_panel_init_backlight_funcs(struct intel_panel *panel)
panel->backlight.set = bxt_set_backlight;
panel->backlight.get = bxt_get_backlight;
panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
} else if (HAS_PCH_CNP(dev_priv)) {
panel->backlight.setup = cnp_setup_backlight;
panel->backlight.enable = cnp_enable_backlight;
panel->backlight.disable = cnp_disable_backlight;
panel->backlight.set = bxt_set_backlight;
panel->backlight.get = bxt_get_backlight;
panel->backlight.hz_to_pwm = cnp_hz_to_pwm;
} else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
HAS_PCH_KBP(dev_priv)) {
panel->backlight.setup = lpt_setup_backlight;