From: Ville Syrjälä Date: Fri, 12 Sep 2025 13:59:26 +0000 (+0300) Subject: drm/i915: Defeature DRRS on LNL+ X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=089b5773c219b9bd5e3c7ac72d6ad933dd050f4d;p=thirdparty%2Fkernel%2Flinux.git drm/i915: Defeature DRRS on LNL+ DRRS has been defeatured on LNL+. Adjust HAS_DOUBLE_BUFFERED_M_N() to match. Note that the M/N registers still appear to be double buffered under the hood but the double buffer update point is now documented to be just the last register write to the M/N registers, so it no longer happens synchronously with the vblank/MSA transmission. We should perhaps rename HAS_DOUBLE_BUFFERED_M_N() to more accurately reflect reality, but couldn't come up with a decent name right now... Bspec: 68917 HSD: 14016007525 Cc: Ankit Nautiyal Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20250912135926.18910-1-ville.syrjala@linux.intel.com Reviewed-by: Ankit Nautiyal --- diff --git a/drivers/gpu/drm/i915/display/intel_display_device.h b/drivers/gpu/drm/i915/display/intel_display_device.h index f329f1beafef6..1f091fbcd0ec1 100644 --- a/drivers/gpu/drm/i915/display/intel_display_device.h +++ b/drivers/gpu/drm/i915/display/intel_display_device.h @@ -155,7 +155,7 @@ struct intel_display_platforms { #define HAS_DISPLAY(__display) (DISPLAY_RUNTIME_INFO(__display)->pipe_mask != 0) #define HAS_DMC(__display) (DISPLAY_RUNTIME_INFO(__display)->has_dmc) #define HAS_DMC_WAKELOCK(__display) (DISPLAY_VER(__display) >= 20) -#define HAS_DOUBLE_BUFFERED_M_N(__display) (DISPLAY_VER(__display) >= 9 || (__display)->platform.broadwell) +#define HAS_DOUBLE_BUFFERED_M_N(__display) (IS_DISPLAY_VER((__display), 9, 14) || (__display)->platform.broadwell) #define HAS_DOUBLE_BUFFERED_LUT(__display) (DISPLAY_VER(__display) >= 30) #define HAS_DOUBLE_WIDE(__display) (DISPLAY_VER(__display) < 4) #define HAS_DP20(__display) ((__display)->platform.dg2 || DISPLAY_VER(__display) >= 14)