From: Matt Roper Date: Thu, 24 Sep 2015 22:53:09 +0000 (-0700) Subject: drm/i915: Determine I915_MAX_PLANES from plane enum X-Git-Tag: firefly_0821_release~176^2~721^2~21^2~67 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=31409e97ef708ba52ddcb9a7b65b8b878ecc08f3;p=firefly-linux-kernel-4.4.55.git drm/i915: Determine I915_MAX_PLANES from plane enum Let the compiler figure out what I915_MAX_PLANES is from 'enum plane' so that we don't need a separate #define. While we're at it, add the cursor plane to the enum. This will cause I915_MAX_PLANES to now include the cursor plane in its count (it didn't previously). This change is safe since we currently only use this value in array declarations (never in the actual code logic); we just wind up allocating slightly more memory than we need to. A followup patch will cause various parts of the code to start using the extra array element where appropriate. (This patch probably should have been squashed with the followup patch, but I couldn't figure out how to get Coccinelle to modify enum declarations...) Suggested-by: Ander Conselvan De Oliveira Signed-off-by: Matt Roper Reviewed-by: Maarten Lankhorst Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index ee478acc0a5b..497ab4e7fc00 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -131,17 +131,17 @@ enum transcoder { #define transcoder_name(t) ((t) + 'A') /* - * This is the maximum (across all platforms) number of planes (primary + - * sprites) that can be active at the same time on one pipe. - * - * This value doesn't count the cursor plane. + * I915_MAX_PLANES in the enum below is the maximum (across all platforms) + * number of planes per CRTC. Not all platforms really have this many planes, + * which means some arrays of size I915_MAX_PLANES may have unused entries + * between the topmost sprite plane and the cursor plane. */ -#define I915_MAX_PLANES 4 - enum plane { PLANE_A = 0, PLANE_B, PLANE_C, + PLANE_CURSOR, + I915_MAX_PLANES, }; #define plane_name(p) ((p) + 'A')