[Intel-gfx] [PATCH 14/40] drm/i915: Override display PHY TX FIFO reset master on chv

[Jesse Barnes]

On Sat, 28 Jun 2014 02:04:05 +0300
ville.syrjala at linux.intel.com wrote:

> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Just an attempt to frob these bits. Apparently we should not need to
> touch them (apart from maybe making sure the override is disabled so
> that the hardware automagically does the right thing).
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h   | 12 ++++++++++++
>  drivers/gpu/drm/i915/intel_dp.c   | 23 +++++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_hdmi.c | 23 +++++++++++++++++++++++
>  3 files changed, 58 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 2a7bc22..d246609 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -758,6 +758,8 @@ enum punit_power_well {
>  #define _VLV_PCS_DW0_CH1		0x8400
>  #define   DPIO_PCS_TX_LANE2_RESET	(1<<16)
>  #define   DPIO_PCS_TX_LANE1_RESET	(1<<7)
> +#define   DPIO_LEFT_TXFIFO_RST_MASTER2	(1<<4)
> +#define   DPIO_RIGHT_TXFIFO_RST_MASTER2	(1<<3)
>  #define VLV_PCS_DW0(ch) _PORT(ch, _VLV_PCS_DW0_CH0, _VLV_PCS_DW0_CH1)
>  
>  #define _VLV_PCS01_DW0_CH0		0x200
> @@ -834,8 +836,18 @@ enum punit_power_well {
>  
>  #define _VLV_PCS_DW11_CH0		0x822c
>  #define _VLV_PCS_DW11_CH1		0x842c
> +#define   DPIO_LANEDESKEW_STRAP_OVRD	(1<<3)
> +#define   DPIO_LEFT_TXFIFO_RST_MASTER	(1<<1)
> +#define   DPIO_RIGHT_TXFIFO_RST_MASTER	(1<<0)
>  #define VLV_PCS_DW11(ch) _PORT(ch, _VLV_PCS_DW11_CH0, _VLV_PCS_DW11_CH1)
>  
> +#define _VLV_PCS01_DW11_CH0		0x022c
> +#define _VLV_PCS23_DW11_CH0		0x042c
> +#define _VLV_PCS01_DW11_CH1		0x262c
> +#define _VLV_PCS23_DW11_CH1		0x282c
> +#define VLV_PCS01_DW11(ch) _PORT(ch, _VLV_PCS01_DW0_CH0, _VLV_PCS01_DW0_CH1)
> +#define VLV_PCS23_DW11(ch) _PORT(ch, _VLV_PCS23_DW0_CH0, _VLV_PCS23_DW0_CH1)
> +
>  #define _VLV_PCS_DW12_CH0		0x8230
>  #define _VLV_PCS_DW12_CH1		0x8430
>  #define VLV_PCS_DW12(ch) _PORT(ch, _VLV_PCS_DW12_CH0, _VLV_PCS_DW12_CH1)
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index c59e8fc..814a950 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -2139,6 +2139,29 @@ static void chv_pre_enable_dp(struct intel_encoder *encoder)
>  
>  	mutex_lock(&dev_priv->dpio_lock);
>  
> +	/* TX FIFO reset source */
> +	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
> +	val |= DPIO_LEFT_TXFIFO_RST_MASTER2;
> +	val &= ~DPIO_LEFT_TXFIFO_RST_MASTER2;
> +	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
> +
> +	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW11(ch));
> +	val &= ~DPIO_LEFT_TXFIFO_RST_MASTER;
> +	val &= ~DPIO_RIGHT_TXFIFO_RST_MASTER;
> +	val |= DPIO_LANEDESKEW_STRAP_OVRD;
> +	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW11(ch), val);
> +
> +	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
> +	val &= ~DPIO_LEFT_TXFIFO_RST_MASTER2;
> +	val &= ~DPIO_RIGHT_TXFIFO_RST_MASTER2;
> +	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
> +
> +	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW11(ch));
> +	val &= ~DPIO_LEFT_TXFIFO_RST_MASTER;
> +	val |= DPIO_RIGHT_TXFIFO_RST_MASTER;
> +	val |= DPIO_LANEDESKEW_STRAP_OVRD;
> +	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW11(ch), val);
> +
>  	/* Deassert soft data lane reset*/
>  	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
>  	val |= CHV_PCS_REQ_SOFTRESET_EN;
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index cda6506..47430d5 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1358,6 +1358,29 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder)
>  
>  	mutex_lock(&dev_priv->dpio_lock);
>  
> +	/* TX FIFO reset source */
> +	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
> +	val |= DPIO_LEFT_TXFIFO_RST_MASTER2;
> +	val &= ~DPIO_LEFT_TXFIFO_RST_MASTER2;
> +	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
> +
> +	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW11(ch));
> +	val &= ~DPIO_LEFT_TXFIFO_RST_MASTER;
> +	val &= ~DPIO_RIGHT_TXFIFO_RST_MASTER;
> +	val |= DPIO_LANEDESKEW_STRAP_OVRD;
> +	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW11(ch), val);
> +
> +	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
> +	val &= ~DPIO_LEFT_TXFIFO_RST_MASTER2;
> +	val &= ~DPIO_RIGHT_TXFIFO_RST_MASTER2;
> +	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
> +
> +	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW11(ch));
> +	val &= ~DPIO_LEFT_TXFIFO_RST_MASTER;
> +	val |= DPIO_RIGHT_TXFIFO_RST_MASTER;
> +	val |= DPIO_LANEDESKEW_STRAP_OVRD;
> +	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW11(ch), val);
> +
>  	/* Deassert soft data lane reset*/
>  	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
>  	val |= CHV_PCS_REQ_SOFTRESET_EN;

Did this actually make a difference?  Would be nice to get some
clarification from the phy guys on this and update our docs...

-- 
Jesse Barnes, Intel Open Source Technology Center