[Intel-gfx] [PATCH 2/3] drm/i915/bxt: Add HPD support for DDIA

[Sivakumar Thulasimani]

Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani at intel.com>

On 8/10/2015 10:35 AM, Sonika Jindal wrote:
> Also remove redundant comments.
>
> Signed-off-by: Sonika Jindal <sonika.jindal at intel.com>
> ---
>   drivers/gpu/drm/i915/i915_irq.c |   10 +++-------
>   1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 02b9e73..9b9533a 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -90,6 +90,7 @@ static const u32 hpd_status_i915[HPD_NUM_PINS] = {
>   
>   /* BXT hpd list */
>   static const u32 hpd_bxt[HPD_NUM_PINS] = {
> +	[HPD_PORT_A] = BXT_DE_PORT_HP_DDIA,
>   	[HPD_PORT_B] = BXT_DE_PORT_HP_DDIB,
>   	[HPD_PORT_C] = BXT_DE_PORT_HP_DDIC
>   };
> @@ -3018,30 +3019,25 @@ static void bxt_hpd_irq_setup(struct drm_device *dev)
>   	u32 hotplug_port = 0;
>   	u32 hotplug_ctrl;
>   
> -	/* Now, enable HPD */
>   	for_each_intel_encoder(dev, intel_encoder) {
>   		if (dev_priv->hotplug.stats[intel_encoder->hpd_pin].state
>   				== HPD_ENABLED)
>   			hotplug_port |= hpd_bxt[intel_encoder->hpd_pin];
>   	}
>   
> -	/* Mask all HPD control bits */
>   	hotplug_ctrl = I915_READ(BXT_HOTPLUG_CTL) & ~BXT_HOTPLUG_CTL_MASK;
>   
> -	/* Enable requested port in hotplug control */
> -	/* TODO: implement (short) HPD support on port A */
> -	WARN_ON_ONCE(hotplug_port & BXT_DE_PORT_HP_DDIA);
> +	if (hotplug_port & BXT_DE_PORT_HP_DDIA)
> +		hotplug_ctrl |= BXT_DDIA_HPD_ENABLE;
>   	if (hotplug_port & BXT_DE_PORT_HP_DDIB)
>   		hotplug_ctrl |= BXT_DDIB_HPD_ENABLE;
>   	if (hotplug_port & BXT_DE_PORT_HP_DDIC)
>   		hotplug_ctrl |= BXT_DDIC_HPD_ENABLE;
>   	I915_WRITE(BXT_HOTPLUG_CTL, hotplug_ctrl);
>   
> -	/* Unmask DDI hotplug in IMR */
>   	hotplug_ctrl = I915_READ(GEN8_DE_PORT_IMR) & ~hotplug_port;
>   	I915_WRITE(GEN8_DE_PORT_IMR, hotplug_ctrl);
>   
> -	/* Enable DDI hotplug in IER */
>   	hotplug_ctrl = I915_READ(GEN8_DE_PORT_IER) | hotplug_port;
>   	I915_WRITE(GEN8_DE_PORT_IER, hotplug_ctrl);
>   	POSTING_READ(GEN8_DE_PORT_IER);

-- 
regards,
Sivakumar