Quoting Ville Syrjala (2018-09-25 20:37:14)
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> With gtt remapping in place we can use arbitrarily large
> framebuffers. Let's bump the limits to 16kx16k on gen7+.
> The limit was chosen to match the maximum 2D surface size
> of the 3D engine.
>
> With the remapping we could easily go higher than that for the
> display engine. However the modesetting ddx will blindly assume
> it can handle whatever is reported via kms. The oversized
> buffer dimensions are not caught by glamor nor Mesa until
> finally an assert will trip when genxml attempts to pack the
> SURFACE_STATE. So we pick a safe limit to avoid the X server
> from crashing (or potentially misbehaving if the genxml asserts
> are compiled out).
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_display.c | 18 ++++++++++++------
> 1 file changed, 12 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index d533a6086169..241b9f6cbb76 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -15524,16 +15524,22 @@ int intel_modeset_init(struct drm_device *dev)
> }
> }
>
> - /* maximum framebuffer dimensions */
> - if (IS_GEN2(dev_priv)) {
> - dev->mode_config.max_width = 2048;
> - dev->mode_config.max_height = 2048;
> + /*
> + * Maximum framebuffer dimensions, chosen to match
> + * the maximum render engine surface size on gen4+.
> + */
> + if (INTEL_GEN(dev_priv) >= 7) {
> + dev->mode_config.max_width = 16384;
> + dev->mode_config.max_height = 16384;
> + } else if (INTEL_GEN(dev_priv) >= 4) {
> + dev->mode_config.max_width = 8192;
> + dev->mode_config.max_height = 8192;
> } else if (IS_GEN3(dev_priv)) {
> dev->mode_config.max_width = 4096;
> dev->mode_config.max_height = 4096;
You have the same problem on gen3 then. 3D pipeline is restricted to 2k.
Different rules for different gen. :(
-Chris
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