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| H A D | i915_irq.c | diff b291681926a142958112eedde62823230d6afb84 Tue Nov 03 01:31:41 CST 2015 Maarten Lankhorst <maarten.lankhorst@linux.intel.com> drm/i915: Extend DSL readout fix to BDW and SKL.
Those platforms have the same bug as haswell, and the same fix applies
to them.
The original HSW fix that this extends is
commit 41b578fb0e8b930f2470d3f673b0fa279e77a7b8
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Tue Sep 22 12:15:54 2015 -0700
drm/i915: workaround bad DSL readout v3
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: stable@vger.kernel.org # v4.3
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91579
Link: http://patchwork.freedesktop.org/patch/msgid/1446535913-31970-3-git-send-email-maarten.lankhorst@linux.intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
diff 41b578fb0e8b930f2470d3f673b0fa279e77a7b8 Tue Sep 22 14:15:54 CDT 2015 Jesse Barnes <jbarnes@virtuousgeek.org> drm/i915: workaround bad DSL readout v3
On HSW at least (still testing other platforms, but should be harmless
elsewhere), the DSL reg reads back as 0 when read around vblank start
time. This ends up confusing the atomic start/end checking code, since
it causes the update to appear as if it crossed a frame count boundary.
Avoid the problem by making sure we don't return scanline_offset from
the get_crtc_scanline function. In moving the code there, I add to add
an additional delay since it could be called and have a legitimate 0
result for some time (depending on the pixel clock).
v2: move hsw dsl read hack to get_crtc_scanline (Ville)
v3: use break instead of goto (Ville)
update comment with workaround details (Ville)
References: https://bugs.freedesktop.org/show_bug.cgi?id=91579
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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