[Intel-gfx] [PATCH] drm/i915: Don't compare has_drrs strictly in pipe config
Daniel Vetter
daniel at ffwll.ch
Wed Nov 25 06:49:33 PST 2015
On Wed, Nov 25, 2015 at 03:26:47PM +0100, Takashi Iwai wrote:
> The commit [cfb23ed622d0: drm/i915: Allow fuzzy matching in
> pipe_config_compare, v2] relaxed the way to compare the pipe
> configurations, but one new comparison sneaked in there: it added the
> strict has_drrs value check. This causes a regression on many
> machines, typically HP laptops with a docking port, where the kernel
> spews warnings and eventually fails to set the mode properly like:
> [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in has_drrs (expected 1, found 0)
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 79 at drivers/gpu/drm/i915/intel_display.c:12700 intel_modeset_check_state+0x5aa/0x870 [i915]()
> pipe state doesn't match!
> ....
>
> This patch just removes the check again for fixing the regression.
>
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=104041
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92456
> Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=956397
> Fixes: cfb23ed622d0 ('drm/i915: Allow fuzzy matching in pipe_config_compare, v2')
> Cc: <stable at vger.kernel.org> # v4.3+
> Reported-and-tested-by: Max Lin <mlin at suse.com>
> Signed-off-by: Takashi Iwai <tiwai at suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
> drivers/gpu/drm/i915/intel_display.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 71860f8680f9..12a2e9d1f633 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -12460,7 +12460,6 @@ intel_pipe_config_compare(struct drm_device *dev,
> if (INTEL_INFO(dev)->gen < 8) {
> PIPE_CONF_CHECK_M_N(dp_m_n);
>
> - PIPE_CONF_CHECK_I(has_drrs);
> if (current_config->has_drrs)
> PIPE_CONF_CHECK_M_N(dp_m2_n2);
> } else
> --
> 2.6.3
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
More information about the Intel-gfx
mailing list