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drm/i915/display: PCH display HPD IRQ is not detected with default fi…
…lter value 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. Program 0xC7204 (PP_CONTROL) bit #0 to '1' to enable workaround and clear to disable it. Driver shall enable this WA when external display is connected and remove WA when display is unplugged or before going into sleep to allow CS entry. Driver shall not enable WA when eDP is connected. Wa_1508796671:adls Cc: Arun Murthy <arun.r.murthy@intel.com> Cc: Uma Shankar <uma.shankar@intel.com> Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
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