On Thu, 26 Jan 2017, Pierre-Louis Bossart
<pierre-louis.boss...@linux.intel.com> wrote:
> Enable chicken bit on LPE mode setup and unmute amp on
> notification
>
> FIXME: should these two phases done somewhere else?
>
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.boss...@linux.intel.com>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 12 ++++++++++++
> drivers/gpu/drm/i915/intel_lpe_audio.c | 27 +++++++++++++++++++++++++++
> 2 files changed, 39 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index a9ffc8d..ee90f64 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2061,6 +2061,18 @@ enum skl_disp_power_wells {
> #define I915_HDMI_LPE_AUDIO_BASE (VLV_DISPLAY_BASE + 0x65000)
> #define I915_HDMI_LPE_AUDIO_SIZE 0x1000
>
> +/* DisplayPort Audio w/ LPE */
> +#define CHICKEN_BIT_DBG_ENABLE (1 << 0)
> +#define AMP_UNMUTE (1 << 1)
The convention is to define registers first and the contents/bits for
each register immedialy below. For groups of registers (like
PORT_EN_B/C/D below) define all registers first and bits immediately
below. (But note that the chicken register is not part of the group.)
> +#define AUD_CHICKEN_BIT_REG 0x62F38
> +#define AUD_PORT_EN_B_DBG 0x62F20
> +#define AUD_PORT_EN_C_DBG 0x62F28
> +#define AUD_PORT_EN_D_DBG 0x62F2C
Please don't define these separately without the display base, use
(VLV_DISPLAY_BASE + 0x62f38) style instead. All the other uses of
VLV_DISPLAY_BASE in the file follow the same convention.
> +#define VLV_AUD_CHICKEN_BIT_REG _MMIO(VLV_DISPLAY_BASE +
> AUD_CHICKEN_BIT_REG)
> +#define VLV_AUD_PORT_EN_B_DBG _MMIO(VLV_DISPLAY_BASE +
> AUD_PORT_EN_B_DBG)
> +#define VLV_AUD_PORT_EN_C_DBG _MMIO(VLV_DISPLAY_BASE +
> AUD_PORT_EN_C_DBG)
> +#define VLV_AUD_PORT_EN_D_DBG _MMIO(VLV_DISPLAY_BASE +
> AUD_PORT_EN_D_DBG)
> +
Would be nice to have a macro VLV_AUD_PORT_EN_DBG(port), but damn those
reg offsets don't make it easy...
> #define GEN6_BSD_RNCID _MMIO(0x12198)
>
> #define GEN7_FF_THREAD_MODE _MMIO(0x20a0)
> diff --git a/drivers/gpu/drm/i915/intel_lpe_audio.c
> b/drivers/gpu/drm/i915/intel_lpe_audio.c
> index 245523e..b3134ef 100644
> --- a/drivers/gpu/drm/i915/intel_lpe_audio.c
> +++ b/drivers/gpu/drm/i915/intel_lpe_audio.c
> @@ -248,6 +248,15 @@ static int lpe_audio_setup(struct drm_i915_private
> *dev_priv)
> goto err_free_irq;
> }
>
> + /* Enable DPAudio debug bits by default */
> + if (IS_CHERRYVIEW(dev_priv)) {
> + u32 chicken_bit;
> +
> + chicken_bit = I915_READ(VLV_AUD_CHICKEN_BIT_REG);
> + I915_WRITE(VLV_AUD_CHICKEN_BIT_REG,
> + chicken_bit | CHICKEN_BIT_DBG_ENABLE);
> + }
> +
> return 0;
> err_free_irq:
> irq_free_desc(dev_priv->lpe_audio.irq);
> @@ -357,6 +366,24 @@ void intel_lpe_audio_notify(struct drm_i915_private
> *dev_priv,
> pdata->tmds_clock_speed = tmds_clk_speed;
> if (link_rate)
> pdata->link_rate = link_rate;
> +
> + if (dp_output) { /* unmute the amp */
> + u32 audio_enable;
> +
> + if (port == PORT_B) {
> + audio_enable = I915_READ(VLV_AUD_PORT_EN_B_DBG);
> + I915_WRITE(VLV_AUD_PORT_EN_B_DBG,
> + audio_enable & ~AMP_UNMUTE);
> + } else if (port == PORT_C) {
> + audio_enable = I915_READ(VLV_AUD_PORT_EN_C_DBG);
> + I915_WRITE(VLV_AUD_PORT_EN_C_DBG,
> + audio_enable & ~AMP_UNMUTE);
> + } else if (port == PORT_D) {
> + audio_enable = I915_READ(VLV_AUD_PORT_EN_D_DBG);
> + I915_WRITE(VLV_AUD_PORT_EN_D_DBG,
> + audio_enable & ~AMP_UNMUTE);
> + }
> + }
> } else {
> memset(pdata->eld.eld_data, 0,
> HDMI_MAX_ELD_BYTES);
--
Jani Nikula, Intel Open Source Technology Center
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