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drm: support for rotated scanout

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For drivers that can support rotated scanout, the extra parameter
checking in drm-core, while nice, tends to get confused.  To solve
this drivers can set the crtc or plane invert_dimensions field so
that the dimension checking takes into account the rotation that
the driver is performing.

v1: original
v2: remove invert_dimensions from plane, at Ville's suggestion.
    Userspace can give rotated src coordinates, so invert_dimensions
    is not required for planes.

Signed-off-by: Rob Clark <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
This commit is contained in:
Rob Clark 2012-09-04 16:35:56 +00:00 • committed by Dave Airlie
commit 7c80e12842
2 changed files with 35 additions and 16 deletions
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5
include/drm/drm_crtc.h
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@ -368,6 +368,9 @@ struct drm_crtc_funcs {
* @enabled: is this CRTC enabled?
* @mode: current mode timings
* @hwmode: mode timings as programmed to hw regs
* @invert_dimensions: for purposes of error checking crtc vs fb sizes,
* invert the width/height of the crtc. This is used if the driver
* is performing 90 or 270 degree rotated scanout
* @x: x position on screen
* @y: y position on screen
* @funcs: CRTC control functions
@ -401,6 +404,8 @@ struct drm_crtc {
*/
struct drm_display_mode hwmode;
bool invert_dimensions;
int x, y;
const struct drm_crtc_funcs *funcs;