Help on drmModeSetPlane

[Ville Syrjälä]

On Wed, Apr 15, 2015 at 08:49:39AM +0000, Xie, William wrote:
> To make it more specific,
> 
> For example:
> 1: video frame size is 1280x720,
> 2: screen resolution is 3200x1800,
> 
> How can I set crtc and src parameters?
> 
> 1: crtc (0, 0, 3200, 1800)  src (0, 0, 3200<<16, 1800<<16)
> 2: crtc (0, 0, 3200, 1800)  src (0, 0, 1280<<16, 720<<16)
> 
> Which one is correct?

2 is correct.

What hardware are you trying this on? Do note that on HSW/BDW/VLV/CHV
the hardware lost the plane scaling ability. It's coming back on SKL.

> 
> William
> 
> From: Xie, William
> Sent: Wednesday, April 15, 2015 3:55 PM
> To: DRI Development; DRI Development
> Subject: Help on drmModeSetPlane
> 
> Question please, could someone share the meaning of the parameters for drmModeSetPlane in libdrm?
> 
> int drmModeSetPlane(int fd, uint32_t plane_id, uint32_t crtc_id,
>                                     uint32_t fb_id, uint32_t flags,
>                                     int32_t crtc_x, int32_t crtc_y,
>                                     uint32_t crtc_w, uint32_t crtc_h,
>                                     uint32_t src_x, uint32_t src_y,
>                                     uint32_t src_w, uint32_t src_h)
> 
> 
> My problem is, whatever value I set, the video is not full screen mode,
> Anything I missed?
> 
> Thanks
> William
> 
> 
> 
> 

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-- 
Ville Syrjälä
Intel OTC