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drm/i915: Propagate PCI read/write errors during vga_set_state() 

This has very little effect other than log the errors in case of failure,
and we then hope for the best.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2014-02-07 18:37:02 -02:00 committed by Daniel Vetter
parent 8bcd45534d
commit 75fa041de7
1 changed files with 11 additions and 2 deletions
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13
drivers/gpu/drm/i915/intel_display.c
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@ -11508,12 +11508,21 @@ int intel_modeset_vga_set_state(struct drm_device *dev, bool state)
unsigned reg = INTEL_INFO(dev)->gen >= 6 ? SNB_GMCH_CTRL : INTEL_GMCH_CTRL;
u16 gmch_ctrl;
pci_read_config_word(dev_priv->bridge_dev, reg, &gmch_ctrl);
if (pci_read_config_word(dev_priv->bridge_dev, reg, &gmch_ctrl)) {
DRM_ERROR("failed to read control word\n");
return -EIO;
}
if (state)
gmch_ctrl &= ~INTEL_GMCH_VGA_DISABLE;
else
gmch_ctrl |= INTEL_GMCH_VGA_DISABLE;
pci_write_config_word(dev_priv->bridge_dev, reg, gmch_ctrl);
if (pci_write_config_word(dev_priv->bridge_dev, reg, gmch_ctrl)) {
DRM_ERROR("failed to write control word\n");
return -EIO;
}
return 0;
}