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drm/i915: tell the user if both KMS and UMS are disabled

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If both KMS is disabled (by i915.modeset=0 or nomodeset parameters) and
UMS is disabled (by CONFIG_DRM_I915_UMS=n, the default), the user might
not be aware his setup is not supported. Inform the users (and, by
extension, the poor i915 developers having to read their dmesgs in bug
reports) why their graphics experience might be lacking.

A similar message was added on the UMS path in
commit e147accbd1
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Thu Oct 10 15:25:37 2013 +0300

    drm/i915: tell the user KMS is required for gen6+

but it won't be reached if CONFIG_DRM_I915_UMS=n since
commit b30324adaf
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Nov 13 22:11:25 2013 +0100

    drm/i915: Deprecated UMS support

v2: Use DRM_DEBUG_DRIVER.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jani Nikula 2014-06-02 16:58:30 +03:00 committed by Daniel Vetter
parent 7daf8d54c1
commit c9cd7b65db
1 changed files with 1 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_drv.c
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@ -1583,6 +1583,7 @@ static int __init i915_init(void)
driver.get_vblank_timestamp = NULL;
#ifndef CONFIG_DRM_I915_UMS
/* Silently fail loading to not upset userspace. */
DRM_DEBUG_DRIVER("KMS and UMS disabled.\n");
return 0;
#endif
}