[Intel-gfx] [PATCH v2 07/17] drm/i915: Introduce spt_irq_handler()
Paulo Zanoni
przanoni at gmail.com
Fri Aug 28 11:20:33 PDT 2015
2015-08-27 17:56 GMT-03:00 <ville.syrjala at linux.intel.com>:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Starting from SPT the only interrupts living in the south are GMBUS and
> HPD. What's worse some of the SPT specific new bits conflict with some
> other bits on earlier PCH generations. So better not use the
> cpt_irq_handler() for SPT+ anymore.
>
> Also kill the hand rolled port E handling with something more
> standardish. This also avoids accidentally confusing port B and port E
> long pulses since the bits occupy the same positions, just in different
> registers.
>
> Also add a comment noting that the short pulse duration bits are
> reserved on LPT+. The 2ms value we program is 0, so no issue wrt. the
> MBZ in the spec.
>
> v2: Call intel_hpd_irq_handler() only once (Paulo)
>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
> drivers/gpu/drm/i915/i915_irq.c | 124 +++++++++++++++++++++++++++-------------
> 1 file changed, 84 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index db27945..978a528 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -1262,6 +1262,16 @@ static bool bxt_port_hotplug_long_detect(enum port port, u32 val)
> }
> }
>
> +static bool spt_port_hotplug2_long_detect(enum port port, u32 val)
> +{
> + switch (port) {
> + case PORT_E:
> + return val & PORTE_HOTPLUG_LONG_DETECT;
> + default:
> + return false;
> + }
> +}
> +
> static bool pch_port_hotplug_long_detect(enum port port, u32 val)
> {
> switch (port) {
> @@ -1271,8 +1281,6 @@ static bool pch_port_hotplug_long_detect(enum port port, u32 val)
> return val & PORTC_HOTPLUG_LONG_DETECT;
> case PORT_D:
> return val & PORTD_HOTPLUG_LONG_DETECT;
> - case PORT_E:
> - return val & PORTE_HOTPLUG_LONG_DETECT;
> default:
> return false;
> }
> @@ -1770,12 +1778,7 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> int pipe;
> - u32 hotplug_trigger;
> -
> - if (HAS_PCH_SPT(dev))
> - hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_SPT;
> - else
> - hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
> + u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
>
> if (hotplug_trigger) {
> u32 dig_hotplug_reg, pin_mask = 0, long_mask = 0;
> @@ -1783,22 +1786,10 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
> dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
>
> - if (HAS_PCH_SPT(dev)) {
> - intel_get_hpd_pins(&pin_mask, &long_mask,
> - hotplug_trigger,
> - dig_hotplug_reg, hpd_spt,
> - pch_port_hotplug_long_detect);
> -
> - /* detect PORTE HP event */
> - dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG2);
> - if (pch_port_hotplug_long_detect(PORT_E,
> - dig_hotplug_reg))
> - long_mask |= 1 << HPD_PORT_E;
> - } else
> - intel_get_hpd_pins(&pin_mask, &long_mask,
> - hotplug_trigger,
> - dig_hotplug_reg, hpd_cpt,
> - pch_port_hotplug_long_detect);
> + intel_get_hpd_pins(&pin_mask, &long_mask,
> + hotplug_trigger,
> + dig_hotplug_reg, hpd_cpt,
> + pch_port_hotplug_long_detect);
>
> intel_hpd_irq_handler(dev, pin_mask, long_mask);
> }
> @@ -1832,6 +1823,43 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
> cpt_serr_int_handler(dev);
> }
>
> +static void spt_irq_handler(struct drm_device *dev, u32 pch_iir)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_SPT &
> + ~SDE_PORTE_HOTPLUG_SPT;
> + u32 hotplug2_trigger = pch_iir & SDE_PORTE_HOTPLUG_SPT;
> + u32 pin_mask = 0, long_mask = 0;
> +
> + if (hotplug_trigger) {
> + u32 dig_hotplug_reg;
> +
> + dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> + I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> +
> + intel_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
> + dig_hotplug_reg, hpd_spt,
> + pch_port_hotplug_long_detect);
> + }
> +
> + if (hotplug2_trigger) {
> + u32 dig_hotplug_reg;
> +
> + dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG2);
> + I915_WRITE(PCH_PORT_HOTPLUG2, dig_hotplug_reg);
> +
> + intel_get_hpd_pins(&pin_mask, &long_mask, hotplug2_trigger,
> + dig_hotplug_reg, hpd_spt,
> + spt_port_hotplug2_long_detect);
> + }
> +
> + if (pin_mask)
> + intel_hpd_irq_handler(dev, pin_mask, long_mask);
intel_hpd_irq_handler() already checks for empty pin_mask.
I'm not sure if my arguments on patch 6 were enough to trigger a v3 of
this patch, so, in case you stay with the current patch 6, then, with
or without any of my suggestions:
Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> +
> + if (pch_iir & SDE_GMBUS_CPT)
> + gmbus_irq_handler(dev);
> +}
> +
> static void ilk_display_irq_handler(struct drm_device *dev, u32 de_iir)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> @@ -2150,7 +2178,11 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
> if (pch_iir) {
> I915_WRITE(SDEIIR, pch_iir);
> ret = IRQ_HANDLED;
> - cpt_irq_handler(dev, pch_iir);
> +
> + if (HAS_PCH_SPT(dev_priv))
> + spt_irq_handler(dev, pch_iir);
> + else
> + cpt_irq_handler(dev, pch_iir);
> } else
> DRM_ERROR("The master control interrupt lied (SDE)!\n");
>
> @@ -3032,9 +3064,6 @@ static void ibx_hpd_irq_setup(struct drm_device *dev)
> if (HAS_PCH_IBX(dev)) {
> hotplug_irqs = SDE_HOTPLUG_MASK;
> enabled_irqs = intel_hpd_enabled_irqs(dev, hpd_ibx);
> - } else if (HAS_PCH_SPT(dev)) {
> - hotplug_irqs = SDE_HOTPLUG_MASK_SPT;
> - enabled_irqs = intel_hpd_enabled_irqs(dev, hpd_spt);
> } else {
> hotplug_irqs = SDE_HOTPLUG_MASK_CPT;
> enabled_irqs = intel_hpd_enabled_irqs(dev, hpd_cpt);
> @@ -3044,9 +3073,8 @@ static void ibx_hpd_irq_setup(struct drm_device *dev)
>
> /*
> * Enable digital hotplug on the PCH, and configure the DP short pulse
> - * duration to 2ms (which is the minimum in the Display Port spec)
> - *
> - * This register is the same on all known PCH chips.
> + * duration to 2ms (which is the minimum in the Display Port spec).
> + * The pulse duration bits are reserved on LPT+.
> */
> hotplug = I915_READ(PCH_PORT_HOTPLUG);
> hotplug &= ~(PORTD_PULSE_DURATION_MASK|PORTC_PULSE_DURATION_MASK|PORTB_PULSE_DURATION_MASK);
> @@ -3054,13 +3082,27 @@ static void ibx_hpd_irq_setup(struct drm_device *dev)
> hotplug |= PORTC_HOTPLUG_ENABLE | PORTC_PULSE_DURATION_2ms;
> hotplug |= PORTB_HOTPLUG_ENABLE | PORTB_PULSE_DURATION_2ms;
> I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
> +}
>
> - /* enable SPT PORTE hot plug */
> - if (HAS_PCH_SPT(dev)) {
> - hotplug = I915_READ(PCH_PORT_HOTPLUG2);
> - hotplug |= PORTE_HOTPLUG_ENABLE;
> - I915_WRITE(PCH_PORT_HOTPLUG2, hotplug);
> - }
> +static void spt_hpd_irq_setup(struct drm_device *dev)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + u32 hotplug_irqs, hotplug, enabled_irqs;
> +
> + hotplug_irqs = SDE_HOTPLUG_MASK_SPT;
> + enabled_irqs = intel_hpd_enabled_irqs(dev, hpd_spt);
> +
> + ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs);
> +
> + /* Enable digital hotplug on the PCH */
> + hotplug = I915_READ(PCH_PORT_HOTPLUG);
> + hotplug |= PORTD_HOTPLUG_ENABLE | PORTC_HOTPLUG_ENABLE |
> + PORTB_HOTPLUG_ENABLE;
> + I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
> +
> + hotplug = I915_READ(PCH_PORT_HOTPLUG2);
> + hotplug |= PORTE_HOTPLUG_ENABLE;
> + I915_WRITE(PCH_PORT_HOTPLUG2, hotplug);
> }
>
> static void bxt_hpd_irq_setup(struct drm_device *dev)
> @@ -4165,10 +4207,12 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
> dev->driver->irq_uninstall = gen8_irq_uninstall;
> dev->driver->enable_vblank = gen8_enable_vblank;
> dev->driver->disable_vblank = gen8_disable_vblank;
> - if (HAS_PCH_SPLIT(dev))
> - dev_priv->display.hpd_irq_setup = ibx_hpd_irq_setup;
> - else
> + if (IS_BROXTON(dev))
> dev_priv->display.hpd_irq_setup = bxt_hpd_irq_setup;
> + else if (HAS_PCH_SPT(dev))
> + dev_priv->display.hpd_irq_setup = spt_hpd_irq_setup;
> + else
> + dev_priv->display.hpd_irq_setup = ibx_hpd_irq_setup;
> } else if (HAS_PCH_SPLIT(dev)) {
> dev->driver->irq_handler = ironlake_irq_handler;
> dev->driver->irq_preinstall = ironlake_irq_reset;
> --
> 2.4.6
>
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--
Paulo Zanoni
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