2015-08-12 12:44 GMT-03:00 <ville.syrjala@xxxxxxxxxxxxxxx>:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> ILK/SNB support port A HPD. While HPD is optional on eDP let's at least
> try to wite it up so that we might notice if the link has issues.
>
> The eDP spec suggests that if HPD is not wired up, one should poll the
> link status instead. We don't even do that currently.
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_irq.c | 59 ++++++++++++++++++++++++++++++++++++++---
> 1 file changed, 56 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index e2485bd..152be8b 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -45,6 +45,10 @@
> * and related files, but that will be described in separate chapters.
> */
>
> +static const u32 hpd_ilk[HPD_NUM_PINS] = {
> + [HPD_PORT_A] = DE_DP_A_HOTPLUG,
> +};
> +
> static const u32 hpd_ibx[HPD_NUM_PINS] = {
> [HPD_CRT] = SDE_CRT_HOTPLUG,
> [HPD_SDVO_B] = SDE_SDVOB_HOTPLUG,
> @@ -1270,6 +1274,16 @@ static bool spt_port_hotplug2_long_detect(enum port port, u32 val)
> }
> }
>
> +static bool ilk_port_hotplug_long_detect(enum port port, u32 val)
> +{
> + switch (port) {
> + case PORT_A:
> + return val & DIGITAL_PORTA_HOTPLUG_LONG_DETECT;
> + default:
> + return false;
> + }
> +}
> +
> static bool pch_port_hotplug_long_detect(enum port port, u32 val)
> {
> switch (port) {
> @@ -1864,6 +1878,19 @@ static void ilk_display_irq_handler(struct drm_device *dev, u32 de_iir)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> enum pipe pipe;
> + u32 hotplug_trigger = de_iir & DE_DP_A_HOTPLUG;
> +
> + if (hotplug_trigger) {
> + u32 dig_hotplug_reg, pin_mask, long_mask;
> +
> + dig_hotplug_reg = I915_READ(DIGITAL_PORT_HOTPLUG_CNTRL);
> + I915_WRITE(DIGITAL_PORT_HOTPLUG_CNTRL, dig_hotplug_reg);
> +
> + intel_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
> + dig_hotplug_reg, hpd_ilk,
> + ilk_port_hotplug_long_detect);
> + intel_hpd_irq_handler(dev, pin_mask, long_mask);
> + }
>
> if (de_iir & DE_AUX_CHANNEL_A)
> dp_aux_irq_handler(dev);
> @@ -3105,6 +3132,28 @@ static void spt_hpd_irq_setup(struct drm_device *dev)
> I915_WRITE(PCH_PORT_HOTPLUG2, hotplug);
> }
>
> +static void ilk_hpd_irq_setup(struct drm_device *dev)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + u32 hotplug_irqs, hotplug, enabled_irqs;
> +
> + hotplug_irqs = DE_DP_A_HOTPLUG;
> + enabled_irqs = intel_hpd_enabled_irqs(dev, hpd_ilk);
> +
> + ilk_update_display_irq(dev_priv, hotplug_irqs, enabled_irqs);
> +
> + /*
> + * Enable digital hotplug on the CPU, and configure the DP short pulse
> + * duration to 2ms (which is the minimum in the Display Port spec)
> + */
> + hotplug = I915_READ(DIGITAL_PORT_HOTPLUG_CNTRL);
> + hotplug &= ~DIGITAL_PORTA_PULSE_DURATION_MASK;
> + hotplug |= DIGITAL_PORTA_HOTPLUG_ENABLE | DIGITAL_PORTA_PULSE_DURATION_2ms;
> + I915_WRITE(DIGITAL_PORT_HOTPLUG_CNTRL, hotplug);
> +
> + ibx_hpd_irq_setup(dev);
> +}
> +
> static void bxt_hpd_irq_setup(struct drm_device *dev)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> @@ -3203,8 +3252,9 @@ static int ironlake_irq_postinstall(struct drm_device *dev)
> DE_AUX_CHANNEL_A |
> DE_PIPEB_CRC_DONE | DE_PIPEA_CRC_DONE |
> DE_POISON);
> - extra_mask = DE_PIPEA_VBLANK | DE_PIPEB_VBLANK | DE_PCU_EVENT |
> - DE_PIPEB_FIFO_UNDERRUN | DE_PIPEA_FIFO_UNDERRUN;
> + extra_mask = (DE_PIPEA_VBLANK | DE_PIPEB_VBLANK | DE_PCU_EVENT |
> + DE_PIPEB_FIFO_UNDERRUN | DE_PIPEA_FIFO_UNDERRUN |
> + DE_DP_A_HOTPLUG);
> }
>
> dev_priv->irq_mask = ~display_mask;
> @@ -4220,7 +4270,10 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
> dev->driver->irq_uninstall = ironlake_irq_uninstall;
> dev->driver->enable_vblank = ironlake_enable_vblank;
> dev->driver->disable_vblank = ironlake_disable_vblank;
> - dev_priv->display.hpd_irq_setup = ibx_hpd_irq_setup;
> + if (INTEL_INFO(dev)->gen >= 7)
> + dev_priv->display.hpd_irq_setup = ibx_hpd_irq_setup;
> + else
> + dev_priv->display.hpd_irq_setup = ilk_hpd_irq_setup;
> } else {
> if (INTEL_INFO(dev_priv)->gen == 2) {
> dev->driver->irq_preinstall = i8xx_irq_preinstall;
> --
> 2.4.6
>
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--
Paulo Zanoni
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