Reduce SHPD_FILTER to 250us for ADL and above. This solution was derived when the below patch was floated. [1]https://patchwork.freedesktop.org/patch/532187 and after some internal discussion Ville's suggestion made sense.
Bspec: 68970 Cc: Uma Shankar <[email protected]> Cc: Ville Syrjala <[email protected]> Signed-off-by: Suraj Kandpal <[email protected]> --- drivers/gpu/drm/i915/display/intel_hotplug_irq.c | 4 +++- drivers/gpu/drm/i915/i915_reg.h | 1 + 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_hotplug_irq.c b/drivers/gpu/drm/i915/display/intel_hotplug_irq.c index f95fa793fabb..95a7ea94f417 100644 --- a/drivers/gpu/drm/i915/display/intel_hotplug_irq.c +++ b/drivers/gpu/drm/i915/display/intel_hotplug_irq.c @@ -842,6 +842,8 @@ static void icp_hpd_irq_setup(struct drm_i915_private *dev_priv) if (INTEL_PCH_TYPE(dev_priv) <= PCH_TGP) intel_uncore_write(&dev_priv->uncore, SHPD_FILTER_CNT, SHPD_FILTER_CNT_500_ADJ); + else + intel_uncore_write(&dev_priv->uncore, SHPD_FILTER_CNT, SHPD_FILTER_CNT_250); ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs); @@ -1049,7 +1051,7 @@ static void mtp_hpd_irq_setup(struct drm_i915_private *i915) enabled_irqs = intel_hpd_enabled_irqs(i915, i915->display.hotplug.pch_hpd); hotplug_irqs = intel_hpd_hotplug_irqs(i915, i915->display.hotplug.pch_hpd); - intel_de_write(i915, SHPD_FILTER_CNT, SHPD_FILTER_CNT_500_ADJ); + intel_de_write(i915, SHPD_FILTER_CNT, SHPD_FILTER_CNT_250); mtp_hpd_invert(i915); ibx_display_interrupt_update(i915, hotplug_irqs, enabled_irqs); diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index dcf64e32cd54..aefad14ab27a 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -4939,6 +4939,7 @@ #define SHPD_FILTER_CNT _MMIO(0xc4038) #define SHPD_FILTER_CNT_500_ADJ 0x001D9 +#define SHPD_FILTER_CNT_250 0x000F8 #define _PCH_DPLL_A 0xc6014 #define _PCH_DPLL_B 0xc6018 -- 2.25.1
