[Intel-gfx] [PATCH] drm/i915: Allow frame buffers up to 4096x4096 on 915/945 class hardware

[Ian Romanick]

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Keith Packard wrote:
> The 915 and 945 scanout engines can handle frame buffers up to 4096 pixels
> wide. Pre-9xx hardware has an 8192 byte stride limit, and so we leave the
> existing 2048 max in place.
> 
> I'm not sure why we limit the height to the same value; there's no intrinsic
> hardware limit in the scanout engine.

Two possible explanations:

  a) It seemed like a good idea at the time.
  b) FUD about rotation.

> Signed-off-by: Keith Packard <keithp at keithp.com>
Acked-by: Ian Romanick <ian.d.romanick at intel.com>

> ---
>  drivers/gpu/drm/i915/intel_display.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 508838e..7b49809 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -3148,6 +3148,9 @@ void intel_modeset_init(struct drm_device *dev)
>  	if (IS_I965G(dev)) {
>  		dev->mode_config.max_width = 8192;
>  		dev->mode_config.max_height = 8192;
> +	} else if (IS_I9XX(dev)) {
> +		dev->mode_config.max_width = 4096;
> +		dev->mode_config.max_height = 4096;
>  	} else {
>  		dev->mode_config.max_width = 2048;
>  		dev->mode_config.max_height = 2048;

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