Backlight support on Cannonpoint is a lot
likely Broxton, but with only one controller (0).
Also other main changes/differences:
- PWM clock frequency = Raw clock frequency = 19.2 MHz or
24 MHz. Value is found in SFUSE_STRAP.
- PWM increment = 1
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.
Cc: Jani Nikula <jani.nik...@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.v...@intel.com>
---
drivers/gpu/drm/i915/intel_panel.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_panel.c
b/drivers/gpu/drm/i915/intel_panel.c
index cb50c52..1978bec 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -1247,6 +1247,18 @@ static u32 bxt_hz_to_pwm(struct intel_connector
*connector, u32 pwm_freq_hz)
}
/*
+ * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
+ * Value is found in SFUSE_STRAP.
+ * 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);
+}
+
+/*
* SPT: This value represents the period of the PWM stream in clock periods
* multiplied by 16 (default increment) or 128 (alternate increment selected in
* SCHICKEN_1 bit 0). PWM clock is 24 MHz.
@@ -1742,13 +1754,16 @@ void intel_panel_destroy_backlight(struct drm_connector
*connector)
intel_dsi_dcs_init_backlight_funcs(connector) == 0)
return;
- if (IS_GEN9_LP(dev_priv)) {
+ if (IS_GEN9_LP(dev_priv) || HAS_PCH_CNP(dev_priv)) {
panel->backlight.setup = bxt_setup_backlight;
panel->backlight.enable = bxt_enable_backlight;
panel->backlight.disable = bxt_disable_backlight;
panel->backlight.set = bxt_set_backlight;
panel->backlight.get = bxt_get_backlight;
- panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
+ if (IS_GEN9_LP(dev_priv))
+ panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
+ else
+ 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;
--
1.9.1
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