First Please accept my apologies，I have no email client on my compute, I will install thunderbird later after my network speed is normal.
This bug is trigged on r5230, and we also find this bug on latest kernel，If you want trigger this bug, execute shell:
#!/bin/bash
cnt=0;while [ 1 ]
do
xrandr --output HDMI-0 --right-of VGA-0 --auto
echo "hdmi----vga"
sleep 8
xrandr --output VGA-0 --auto --output HDMI-0 --off
sleep 3
let cnt+=1;
echo $cnt
done
at the same time, open a new terminal, press F11 to fast switch this window between maximize size and normal size to improve the possibility，attachement picture
shows the phenomenon.
I add some debug messages:
[ 89.065206] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:589, set->crtc->primary->fb: 0xffffffa0e5956100, set->fb: 0xffffffa0e701e400
[ 89.065209] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:601
[ 89.065213] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:713, fb_changed: 1, mode_changed: 0
[ 89.065216] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1148, x: 0: y: 0, crtc: 0xffffffa0e62dc000, atomic: 0
[ 89.065222] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1426, fb_location: 0x117f2000, target_fb->width: 1920, target_fb->height: 1080
[ 89.065223] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1430, fb_pitch_pixels: 1920, target_fb->pitches[0]: 7680, target_fb->format->cpp[0]: 4
[ 89.065240] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:752*****************************************************************
[ 92.079288] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:589, set->crtc->primary->fb: 0xffffffa0e701e400, set->fb: 0xffffffa0eafced00
[ 92.079291] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:601
[ 92.079295] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:713, fb_changed: 1, mode_changed: 0
[ 92.079298] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1148, x: 0: y: 0, crtc: 0xffffffa0e62dc000, atomic: 0
[ 92.079304] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1426, fb_location: 0x10000000, target_fb->width: 3840, target_fb->height: 1080
[ 92.079306] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1430, fb_pitch_pixels: 3840, target_fb->pitches[0]: 15360, target_fb->format->cpp[0]: 4
[ 92.079323] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:752*****************************************************************
[ 92.080382] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:589, set->crtc->primary->fb: 0x0, set->fb: 0xffffffa0eafced00
[ 92.080384] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:595
[ 92.080387] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:713, fb_changed: 0, mode_changed: 1
[ 92.080389] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:715
[ 92.083143] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1148, x: 1920: y: 0, crtc: 0xffffffa0e62db000, atomic: 0
[ 92.083149] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1426, fb_location: 0x10000000, target_fb->width: 3840, target_fb->height: 1080
[ 92.083164] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1430, fb_pitch_pixels: 3840, target_fb->pitches[0]: 15360, target_fb->format->cpp[0]: 4
[ 92.120595] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:752*****************************************************************
[ 100.157744] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:589, set->crtc->primary->fb: 0xffffffa0eafced00, set->fb: 0xffffffa0f3a5bb00
[ 100.157746] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:601
[ 100.157749] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:713, fb_changed: 1, mode_changed: 0
[ 100.157752] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1148, x: 0: y: 0, crtc: 0xffffffa0e62dc000, atomic: 0
[ 100.157758] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1426, fb_location: 0x1790c000, target_fb->width: 1920, target_fb->height: 1080
[ 100.157760] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1430, fb_pitch_pixels: 1920, target_fb->pitches[0]: 7680, target_fb->format->cpp[0]: 4
[ 100.157777] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:752*****************************************************************
[ 103.166751] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:589, set->crtc->primary->fb: 0xffffffa0e9a0cd00, set->fb: 0xffffffa0e9a0cd00
[ 103.166757] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:713, fb_changed: 0, mode_changed: 0
[ 103.166758] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:752*****************************************************************
[ 103.169353] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:589, set->crtc->primary->fb: 0x0, set->fb: 0xffffffa0e9a0cd00
[ 103.169355] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:595
[ 103.169359] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:713, fb_changed: 0, mode_changed: 1
[ 103.169360] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:715
[ 103.170396] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1148, x: 1920: y: 0, crtc: 0xffffffa0e62db000, atomic: 0
[ 103.170403] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1426, fb_location: 0x11fea000, target_fb->width: 3840, target_fb->height: 1080
[ 103.170404] lzn debug, drivers/gpu/drm/radeon/atombios_crtc.c:dce4_crtc_do_set_base:1430, fb_pitch_pixels: 3840, target_fb->pitches[0]: 15360, target_fb->format->cpp[0]: 4
[ 103.224592] lzn debug, drivers/gpu/drm/drm_crtc_helper.c:drm_crtc_helper_set_config:752*****************************************************************
when bug is triggerd, fb_changed and mode_changed are zero, and crtc's pitch may not be updated.
you can refer to dce_v6_0_page_flip in amdgpu，all amdgpu driver update pitch in page_flip.
----
主 题：Re: [PATCH] drm/radeon: Update pitch for page flip
日 期：2021-08-02 16:31
发件人：Daniel Vetter
收件人：Christian König
On Mon, Aug 02, 2021 at 10:12:47AM +0200, Christian König wrote:
> Am 02.08.21 um 09:43 schrieb Zhenneng Li:
> > When primary bo is updated, crtc's pitch may
> > have not been updated, this will lead to show
> > disorder content when user changes display mode,
> > we update crtc's pitch in page flip to avoid
> > this bug.
> > This refers to amdgpu's pageflip.
>
> Alex is the expert to ask about that code, but I'm not sure if that is
> really correct for the old hardware.
>
> As far as I know the crtc's pitch should not change during a page flip, but
> only during a full mode set.
>
> So could you elaborate a bit more how you trigger this?
legacy page_flip ioctl only verifies that the fb->format stays the same.
It doesn't check anything else (afair never has), this is all up to
drivers to verify.
Personally I'd say add a check to reject this, since testing this and
making sure it really works everywhere is probably a bit much on this old
hw.
-Daniel
>
> Thanks,
> Christian.
>
> >
> > Cc: Alex Deucher
> > Cc: "Christian König"
> > Cc: "Pan, Xinhui"
> > Cc: David Airlie
> > Cc: Daniel Vetter
> > Cc: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> > Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> > Cc: linux-kernel@xxxxxxxxxxxxxxx
> > Signed-off-by: Zhenneng Li
> > ---
> > drivers/gpu/drm/radeon/evergreen.c | 8 +++++++-
> > 1 file changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
> > index 36a888e1b179..eeb590d2dec2 100644
> > --- a/drivers/gpu/drm/radeon/evergreen.c
> > +++ b/drivers/gpu/drm/radeon/evergreen.c
> > @@ -28,6 +28,7 @@
> > #include
> > #include
> > +#include
> > #include "atom.h"
> > #include "avivod.h"
> > @@ -1414,10 +1415,15 @@ void evergreen_page_flip(struct radeon_device *rdev, int crtc_id, u64 crtc_base,
> > bool async)
> > {
> > struct radeon_crtc *radeon_crtc = rdev->mode_info.crtcs[crtc_id];
> > + struct drm_framebuffer *fb = radeon_crtc->base.primary->fb;
> > - /* update the scanout addresses */
> > + /* flip at hsync for async, default is vsync */
> > WREG32(EVERGREEN_GRPH_FLIP_CONTROL + radeon_crtc->crtc_offset,
> > async ? EVERGREEN_GRPH_SURFACE_UPDATE_H_RETRACE_EN : 0);
> > + /* update pitch */
> > + WREG32(EVERGREEN_GRPH_PITCH + radeon_crtc->crtc_offset,
> > + fb->pitches[0] / fb->format->cpp[0]);
> > + /* update the scanout addresses */
> > WREG32(EVERGREEN_GRPH_PRIMARY_SURFACE_ADDRESS_HIGH + radeon_crtc->crtc_offset,
> > upper_32_bits(crtc_base));
> > WREG32(EVERGREEN_GRPH_PRIMARY_SURFACE_ADDRESS + radeon_crtc->crtc_offset,
> >
> > No virus found
> > Checked by Hillstone Network AntiVirus
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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