Commit f4502e6e authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Sasha Levin

drm/i915: Don't leave old junk in ilk active watermarks on readout

[ Upstream commit 7045c368 ]

When we read out the watermark state from the hardware we're supposed to
transfer that into the active watermarks, but currently we fail to any
part of the active watermarks that isn't explicitly written. Let's clear
it all upfront.

Looks like this has been like this since the beginning, when I added the
readout. No idea why I didn't clear it up.

Cc: Matt Roper <matthew.d.roper@intel.com>
Fixes: 243e6a44 ("drm/i915: Init HSW watermark tracking in intel_modeset_setup_hw_state()")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: default avatarMatt Roper <matthew.d.roper@intel.com>
Signed-off-by: default avatarMatt Roper <matthew.d.roper@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1463151318-14719-2-git-send-email-ville.syrjala@linux.intel.com
(cherry picked from commit 15606534)
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
parent 732468f7
......@@ -2952,6 +2952,8 @@ static void ilk_pipe_wm_get_hw_state(struct drm_crtc *crtc)
if (IS_HASWELL(dev) || IS_BROADWELL(dev))
hw->wm_linetime[pipe] = I915_READ(PIPE_WM_LINETIME(pipe));
memset(active, 0, sizeof(*active));
active->pipe_enabled = intel_crtc_active(crtc);
if (active->pipe_enabled) {
......
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