From 632f3ab95fe2ffebf09969a57ab21be409ed7dcc Mon Sep 17 00:00:00 2001 From: "Lu, Han" Date: Tue, 5 May 2015 09:05:47 +0800 Subject: [PATCH] drm/i915/audio: add codec wakeup override enabled/disable callback Add support for enabling codec wakeup override signal to allow re-enumeration of the controller on SKL after resume from low power state. In SKL, HDMI/DP codec and PCH HD Audio Controller are in different power wells, so it's necessary to reset display audio codecs when power well on, otherwise display audio codecs will disappear when resume from low power state. Reset steps when power on: enable codec wakeup -> azx_init_chip() -> disable codec wakeup v3 by Jani: Simplify to only support toggling the appropriate chicken bit. v4 by Han: add explanation and specify the hw swquence. Signed-off-by: Lu, Han Signed-off-by: Jani Nikula Acked-by: Daniel Vetter Signed-off-by: Takashi Iwai --- drivers/gpu/drm/i915/i915_reg.h | 3 +++ drivers/gpu/drm/i915/intel_audio.c | 27 +++++++++++++++++++++++++++ include/drm/i915_component.h | 1 + 3 files changed, 31 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 3da1af46625c..7d88f4f51594 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -6477,6 +6477,9 @@ enum skl_disp_power_wells { #define AUDIO_CP_READY(trans) ((1 << 1) << ((trans) * 4)) #define AUDIO_ELD_VALID(trans) ((1 << 0) << ((trans) * 4)) +#define HSW_AUD_CHICKENBIT 0x65f10 +#define SKL_AUD_CODEC_WAKE_SIGNAL (1 << 15) + /* HSW Power Wells */ #define HSW_PWR_WELL_BIOS 0x45400 /* CTL1 */ #define HSW_PWR_WELL_DRIVER 0x45404 /* CTL2 */ diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c index 2396cc702d18..ef342571ae6a 100644 --- a/drivers/gpu/drm/i915/intel_audio.c +++ b/drivers/gpu/drm/i915/intel_audio.c @@ -475,6 +475,32 @@ static void i915_audio_component_put_power(struct device *dev) intel_display_power_put(dev_to_i915(dev), POWER_DOMAIN_AUDIO); } +static void i915_audio_component_codec_wake_override(struct device *dev, + bool enable) +{ + struct drm_i915_private *dev_priv = dev_to_i915(dev); + u32 tmp; + + if (!IS_SKYLAKE(dev_priv)) + return; + + /* + * Enable/disable generating the codec wake signal, overriding the + * internal logic to generate the codec wake to controller. + */ + tmp = I915_READ(HSW_AUD_CHICKENBIT); + tmp &= ~SKL_AUD_CODEC_WAKE_SIGNAL; + I915_WRITE(HSW_AUD_CHICKENBIT, tmp); + usleep_range(1000, 1500); + + if (enable) { + tmp = I915_READ(HSW_AUD_CHICKENBIT); + tmp |= SKL_AUD_CODEC_WAKE_SIGNAL; + I915_WRITE(HSW_AUD_CHICKENBIT, tmp); + usleep_range(1000, 1500); + } +} + /* Get CDCLK in kHz */ static int i915_audio_component_get_cdclk_freq(struct device *dev) { @@ -495,6 +521,7 @@ static const struct i915_audio_component_ops i915_audio_component_ops = { .owner = THIS_MODULE, .get_power = i915_audio_component_get_power, .put_power = i915_audio_component_put_power, + .codec_wake_override = i915_audio_component_codec_wake_override, .get_cdclk_freq = i915_audio_component_get_cdclk_freq, }; diff --git a/include/drm/i915_component.h b/include/drm/i915_component.h index 3e2f22e5bf3c..c9a8b64aa33b 100644 --- a/include/drm/i915_component.h +++ b/include/drm/i915_component.h @@ -31,6 +31,7 @@ struct i915_audio_component { struct module *owner; void (*get_power)(struct device *); void (*put_power)(struct device *); + void (*codec_wake_override)(struct device *, bool enable); int (*get_cdclk_freq)(struct device *); } *ops; };