Commit 5349ef3127c77075ff70b2014f17ae0fbcaaf199 (drm/fb: fix
FBIOGET/PUT_VSCREENINFO pixel clock handling) changed the logic of
when a pixclock was valid vs invalid.

The atomic kernel mode setting used by the kernel debugger relies upon
the drm_fb_helper_check_var() to always return -EINVAL.  Until a
better solution exists, this behavior will be restored.

CC: David Airlie <[email protected]>
CC: Jesse Barnes <[email protected]>
CC: Clemens Ladisch <[email protected]>
Signed-off-by: Jason Wessel <[email protected]>
---
 drivers/gpu/drm/drm_fb_helper.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 6245add..de82e20 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -685,7 +685,7 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
        struct drm_framebuffer *fb = fb_helper->fb;
        int depth;
 
-       if (var->pixclock != 0)
+       if (var->pixclock != 0 || in_dbg_master())
                return -EINVAL;
 
        /* Need to resize the fb object !!! */
-- 
1.6.4.rc1


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