[Intel-gfx] [PATCH 2/2] drm/i915: Set invert bit for hpd based on VBT

[Jani Nikula]

On Thu, 04 Feb 2016, Shubhangi Shrivastava <shubhangi.shrivastava at intel.com> wrote:
> This patch sets the invert bit for hpd detection for each port
> based on vbt configuration. since each AOB can be designed to
> depend on invert bit or not, it is expected if an AOB requires
> invert bit, the user will set respective bit in VBT.
>
> Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani at intel.com>
> Signed-off-by: Durgadoss R <durgadoss.r at intel.com>
> Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_irq.c | 49 +++++++++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/i915_reg.h |  9 ++++++++
>  2 files changed, 58 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 25a8937..305e6dd 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -3424,6 +3424,54 @@ static void ibx_hpd_irq_setup(struct drm_device *dev)
>  	I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
>  }
>  
> +/*
> + * For BXT invert bit has to be set based on AOB design
> + * for HPD detection logic, update it based on VBT fields.
> + */
> +static void bxt_hpd_set_invert(struct drm_device *dev, u32 hotplug_port)
> +{
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	int i, reg_val, val = 0;
> +
> +	for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
> +
> +		/* Proceed only if invert bit is set */
> +		if (dev_priv->vbt.child_dev[i].common.hpd_invert == 0)
> +			continue;
> +
> +		/*
> +		 * Convert dvo_port to PORT_X and set appropriate bit
> +		 * only if hotplug is enabled on that port
> +		 */
> +		switch (dev_priv->vbt.child_dev[i].common.dvo_port) {
> +		case DVO_PORT_DPA:
> +		case DVO_PORT_HDMIA:
> +			if (hotplug_port & BXT_DE_PORT_HP_DDIA)
> +				val |= BXT_DDIA_HPD_INVERT;
> +			break;
> +		case DVO_PORT_DPB:
> +		case DVO_PORT_HDMIB:
> +			if (hotplug_port & BXT_DE_PORT_HP_DDIB)
> +				val |= BXT_DDIB_HPD_INVERT;
> +			break;
> +		case DVO_PORT_DPC:
> +		case DVO_PORT_HDMIC:
> +			if (hotplug_port & BXT_DE_PORT_HP_DDIC)
> +				val |= BXT_DDIC_HPD_INVERT;
> +			break;
> +		default:
> +			DRM_ERROR("HPD invert set for invalid dvo port %d\n",
> +				   dev_priv->vbt.child_dev[i].common.dvo_port);
> +			break;
> +		}
> +	}
> +	reg_val = I915_READ(BXT_HOTPLUG_CTL);
> +	DRM_DEBUG_KMS("Invert bit setting: hp_ctl:%x hp_port:%x val:%x\n",
> +				reg_val, hotplug_port, val);
> +	reg_val &= ~BXT_DDI_HPD_INVERT_MASK;
> +	I915_WRITE(BXT_HOTPLUG_CTL, reg_val | val);
> +}

No, we don't want this here. Separate VBT parsing from the rest of the
logic. See [1] for some directions where I want to take this type of
things.

BR,
Jani.

[1] http://mid.gmane.org/cover.1452541881.git.jani.nikula@intel.com



> +
>  static void spt_hpd_irq_setup(struct drm_device *dev)
>  {
>  	struct drm_i915_private *dev_priv = dev->dev_private;
> @@ -3494,6 +3542,7 @@ static void bxt_hpd_irq_setup(struct drm_device *dev)
>  	hotplug |= PORTC_HOTPLUG_ENABLE | PORTB_HOTPLUG_ENABLE |
>  		PORTA_HOTPLUG_ENABLE;
>  	I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
> +	bxt_hpd_set_invert(dev, enabled_irqs);
>  }
>  
>  static void ibx_irq_postinstall(struct drm_device *dev)
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 0a98889..01bd3c5 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5936,6 +5936,15 @@ enum skl_disp_power_wells {
>  #define GEN8_PCU_IIR _MMIO(0x444e8)
>  #define GEN8_PCU_IER _MMIO(0x444ec)
>  
> +/* BXT hotplug control */
> +#define BXT_HOTPLUG_CTL			_MMIO(0xC4030)
> +#define BXT_DDIA_HPD_INVERT		(1 << 27)
> +#define BXT_DDIC_HPD_INVERT		(1 << 11)
> +#define BXT_DDIB_HPD_INVERT		(1 << 3)
> +#define BXT_DDI_HPD_INVERT_MASK		(BXT_DDIA_HPD_INVERT | \
> +					 BXT_DDIB_HPD_INVERT | \
> +					 BXT_DDIC_HPD_INVERT)
> +
>  #define ILK_DISPLAY_CHICKEN2	_MMIO(0x42004)
>  /* Required on all Ironlake and Sandybridge according to the B-Spec. */
>  #define  ILK_ELPIN_409_SELECT	(1 << 25)

-- 
Jani Nikula, Intel Open Source Technology Center