On TGP, the RTC (always running) was reduced from 3MHz to 32KHz.
As a result of this change, when HPD active going low pulse or HPD IRQ
is presented and the refclk (19.2MHz) is not toggling already toggling,
there is a 60 to 90us synchronization delay which effectively reduces
the duration of the IRQ pulse to less than the programmed 500us filter
value and the hot plug interrupt is NOT registered.
Solution was to 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 <uma.shankar@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Suggested-by: Ville Syrjala <ville.syrjala@linux.intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230720104624.3063544-1-suraj.kandpal@intel.com
Split (non-hotplug) display irq handling out of i915_irq.[ch] into
display/intel_display_irq.[ch].
v3:
- Preserve [I915_MAX_PIPES] harder (kernel test robot)
v2:
- Rebase
- Preserve [I915_MAX_PIPES] in functions (kernel test robot)
Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230515101738.2399816-3-jani.nikula@intel.com
Split hotplug irq handling out of i915_irq.[ch] into
display/intel_hotplug_irq.[ch].
The line between the new intel_hotplug_irq.[ch] and the existing
intel_hotplug.[ch] needs further clarification, but the first step is to
move the stuff out of i915_irq.[ch].
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230515101738.2399816-2-jani.nikula@intel.com
