On Thu, Dec 07, 2017 at 05:26:00PM +0800, Alex Tu wrote:
> Rrefer to another patch [1] on mesa to extend width/height to 16384.
> For issue :
> - https://bugs.freedesktop.org/show_bug.cgi?id=102508
> - LP: #1714178 Triple monitor display failed with Dell Dock (HiDPI)
>
> [1] https://patchwork.freedesktop.org/patch/124918/
>
> Signed-off-by: Alex Tu <alex...@canonical.com>
> ---
> drivers/gpu/drm/i915/intel_display.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index 47a2f6acee50..556fa57b18b8 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -13905,7 +13905,7 @@ u32 intel_fb_pitch_limit(struct drm_i915_private
> *dev_priv,
> /* "The stride in bytes must not exceed the of the size of 8K
> * pixels and 32K bytes."
The spec queote clearly says the patch is wrong. Either that or the spec
quote is outdated.
> */
> - return min(8192 * cpp, 32768);
> + return min(16384 * cpp, 65536);
> } else if (gen >= 5 && !HAS_GMCH_DISPLAY(dev_priv)) {
> return 32*1024;
> } else if (gen >= 4) {
> @@ -14604,8 +14604,8 @@ int intel_modeset_init(struct drm_device *dev)
> dev->mode_config.max_width = 4096;
> dev->mode_config.max_height = 4096;
> } else {
> - dev->mode_config.max_width = 8192;
> - dev->mode_config.max_height = 8192;
> + dev->mode_config.max_width = 16384;
> + dev->mode_config.max_height = 16384;
Even if this would be correct (which it's not for most platforms at
least, not quite sure about the very latest hardware), anyone doing
this should at least do a cursory check of the relevant math in the
driver to make seure we don't end up with integer overflows.
> }
>
> if (IS_I845G(dev_priv) || IS_I865G(dev_priv)) {
> --
> 2.11.0
>
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--
Ville Syrjälä
Intel OTC
