On Tue, Nov 27, 2012 at 3:32 AM, Tomi Valkeinen <tomi.valkeinen@xxxxxx> wrote:
> Ok. So X is configuring video2 overlay for some reason. XVideo, perhaps?
That was my guess too, and after some digging I am fairly certain this
is the case.
> Anyway, I guess it's a valid thing to configure the overlay with
> paddr == 0 when the overlay is disabled. In fact, paddr == 0 check
> is in any case quite limited, as if the board's physical memory
> doesn't contain the given paddr, the DSS HW will fail just as it
> would for paddr 0. So the paddr == 0 check is more of a sanity check
> than a comprehensive test.
>
> Can you try the following patch:
>
> diff --git a/drivers/video/omap2/dss/overlay.c b/drivers/video/omap2/dss/overlay.c
> index 45f4994..e271e28 100644
> --- a/drivers/video/omap2/dss/overlay.c
> +++ b/drivers/video/omap2/dss/overlay.c
> @@ -130,11 +130,6 @@ void dss_uninit_overlays(struct platform_device *pdev)
> int dss_ovl_simple_check(struct omap_overlay *ovl,
> const struct omap_overlay_info *info)
> {
> - if (info->paddr == 0) {
> - DSSERR("check_overlay: paddr cannot be 0\n");
> - return -EINVAL;
> - }
> -
> if ((ovl->caps & OMAP_DSS_OVL_CAP_SCALE) == 0) {
> if (info->out_width != 0 && info->width != info->out_width) {
> DSSERR("check_overlay: overlay %d doesn't support "
I tried something similar over the weekend (just removed the return so
I still got the error printout) and found that the simple_check failed
in 2 more places.
Here is the patch I ended up with to get a successful simple_check:
--- a/drivers/video/omap2/dss/overlay.c
+++ b/drivers/video/omap2/dss/overlay.c
@@ -610,7 +610,7 @@ int dss_ovl_simple_check(struct omap_overlay *ovl,
{
if (info->paddr == 0) {
DSSERR("check_overlay: paddr cannot be 0\n");
- return -EINVAL;
+// return -EINVAL;
}
if ((ovl->caps & OMAP_DSS_OVL_CAP_SCALE) == 0) {
@@ -630,7 +630,7 @@ int dss_ovl_simple_check(struct omap_overlay *ovl,
if ((ovl->supported_modes & info->color_mode) == 0) {
DSSERR("check_overlay: overlay %d doesn't support mode %d\n",
ovl->id, info->color_mode);
- return -EINVAL;
+// return -EINVAL;
}
if (info->zorder >= omap_dss_get_num_overlays()) {
@@ -641,7 +641,7 @@ int dss_ovl_simple_check(struct omap_overlay *ovl,
if (dss_feat_rotation_type_supported(info->rotation_type) == 0) {
DSSERR("check_overlay: rotation type %d not supported\n",
info->rotation_type);
- return -EINVAL;
+// return -EINVAL;
}
return 0;
After digging a little more it turned out that the continual
restarting of X wasn't due to the above error, but to a build system
glitch. So the above issue doesn't block a basic X session.
I checked XVideo both with and without the above patch and it is
broken in both cases. I'm beginning to suspect that this might be a
user space bug and will do a little investigation.
Because of this I don't think any dss changes should be made at this point.
During my testing I think I uncovered another issue :-(
I set omapdss.def_disp=lcd43 on the kernel command line to see if the
behavior changed with the LCD as the default device.
What I encountered was a null pointer crash:
[ 3.483062] fbcvt: 1024x768@60: CVT Name - .786M3-R
[ 3.488250] Unable to handle kernel NULL pointer dereference at
virtual address 00000028
[ 3.496765] pgd = c0004000
[ 3.499603] [00000028] *pgd=00000000
[ 3.503387] Internal error: Oops: 5 [#1] PREEMPT ARM
[ 3.508605] Modules linked in:
[ 3.511810] CPU: 0 Not tainted (3.6.0 #1)
[ 3.516357] PC is at dss_mgr_check_timings+0x4/0x30
[ 3.521484] LR is at dpi_check_timings+0x18/0xb8
[ 3.526336] pc : [<c025df70>] lr : [<c0260dc0>] psr: 40000013
[ 3.526336] sp : dec2bd88 ip : 22222222 fp : def7e180
[ 3.538330] r10: def951c0 r9 : def61000 r8 : de41b858
[ 3.543823] r7 : dec2bdfc r6 : c06c0a50 r5 : dec2be00 r4 : deea1cd4
[ 3.550659] r3 : dec1ba40 r2 : dec2bdc8 r1 : dec2be00 r0 : 00000000
[ 3.557495] Flags: nZcv IRQs on FIQs on Mode SVC_32 ISA ARM
Segment kernel
[ 3.565155] Control: 10c5387d Table: 80004019 DAC: 00000015
[ 3.571166] Process swapper (pid: 1, stack limit = 0xdec2a2f0)
[ 3.577270] Stack: (0xdec2bd88 to 0xdec2c000)
[ 3.581848] bd80: dec1ba40 c0260dc0 ffffffff
deea1cd4 def7e180 c046a7d0
[ 3.590423] bda0: 22222222 22222222 22222222 22222222 deea1cd4
c06c0a50 dec2be00 dec2bdfc
[ 3.598968] bdc0: deea1cd4 c06c0a50 dec2be00 c026e738 c06c0a50
00000000 de41b800 c046749c
[ 3.607513] bde0: 0000003d c0495788 00000018 00000000 00000010
def98640 dec00140 00000000
[ 3.616088] be00: 03000400 0000dac0 00300020 00040050 0003000f
00000001 00000000 00000000
[ 3.624664] be20: 00000001 00000000 00000000 c0459380 deea257c
c06c0d00 dec2be50 00000000
[ 3.633209] be40: c025cc10 c029a98c 00000000 c029ae80 dec075d8
00000000 00000000 de41b800
[ 3.641784] be60: c06c1200 c06c3098 c06c3090 de41b80c 00000002
00000001 de41b800 c0689470
[ 3.650360] be80: def99148 def99148 dec2beb8 c01371c4 dec1ba40
00000000 def99148 decdf208
[ 3.658935] bea0: def95240 c0137e24 00000000 c0054e18 00000000
00000003 decdf208 00000000
[ 3.667510] bec0: c06e25dc c06c3098 c06e25dc c06e25dc c029c728
0000009e 00000000 c068920c
[ 3.676055] bee0: 00000000 c029d830 c029d81c c029c514 c06e25dc
c06c3098 c06c3098 c06c30cc
[ 3.684631] bf00: c06e25dc c029c790 00000000 dec2bf18 c06e25dc
c029aa9c dec077d8 decd9670
[ 3.693176] bf20: c06e25dc c06e25dc c06e8868 def95240 00000000
c029bb2c c05a9b18 c05a9b18
[ 3.701751] bf40: c06e25dc 00000001 c06a0c9c c0710300 0000009e
c029ccb4 00000000 c06e25c8
[ 3.710296] bf60: 00000001 c06a0c9c c0710300 0000009e c068920c
c029daa4 00000007 c06967d8
[ 3.718872] bf80: c06a0c9c c0689234 dec2a000 c0008654 c068920c
976c0d2e c06a0cc4 00000008
[ 3.727447] bfa0: 00000007 c06967d8 c06a0c9c c0710300 0000009e
c0669160 c06967e0 c06698d8
[ 3.735992] bfc0: 00000007 00000007 c0669160 00000013 00000000
00000000 00000000 c06697a0
[ 3.744567] bfe0: c000eea8 00000013 00000000 00000000 00000000
c000eea8 fffffff7 dffefffe
[ 3.753143] [<c025df70>] (dss_mgr_check_timings+0x4/0x30) from
[<c0260dc0>] (dpi_check_timings+0x18/0xb8)
[ 3.763183] [<c0260dc0>] (dpi_check_timings+0x18/0xb8) from
[<c026e738>] (tfp410_check_timings+0x28/0x3c)
[ 3.773223] [<c026e738>] (tfp410_check_timings+0x28/0x3c) from
[<c046749c>] (omapfb_parse_def_modes+0x338/0x3f4)
[ 3.783905] [<c046749c>] (omapfb_parse_def_modes+0x338/0x3f4) from
[<c0689470>] (omapfb_probe+0x210/0x600)
[ 3.794036] [<c0689470>] (omapfb_probe+0x210/0x600) from
[<c029d830>] (platform_drv_probe+0x14/0x18)
[ 3.803619] [<c029d830>] (platform_drv_probe+0x14/0x18) from
[<c029c514>] (driver_probe_device+0x11c/0x330)
[ 3.813812] [<c029c514>] (driver_probe_device+0x11c/0x330) from
[<c029c790>] (__driver_attach+0x68/0x8c)
[ 3.823760] [<c029c790>] (__driver_attach+0x68/0x8c) from
[<c029aa9c>] (bus_for_each_dev+0x48/0x80)
[ 3.833251] [<c029aa9c>] (bus_for_each_dev+0x48/0x80) from
[<c029bb2c>] (bus_add_driver+0xf0/0x248)
[ 3.842742] [<c029bb2c>] (bus_add_driver+0xf0/0x248) from
[<c029ccb4>] (driver_register+0x9c/0x12c)
[ 3.852203] [<c029ccb4>] (driver_register+0x9c/0x12c) from
[<c029daa4>] (platform_driver_probe+0x18/0x9c)
[ 3.862243] [<c029daa4>] (platform_driver_probe+0x18/0x9c) from
[<c0689234>] (omapfb_init+0x28/0x54)
[ 3.871826] [<c0689234>] (omapfb_init+0x28/0x54) from [<c0008654>]
(do_one_initcall+0x90/0x160)
[ 3.880950] [<c0008654>] (do_one_initcall+0x90/0x160) from
[<c06698d8>] (kernel_init+0x138/0x1f8)
[ 3.890228] [<c06698d8>] (kernel_init+0x138/0x1f8) from
[<c000eea8>] (kernel_thread_exit+0x0/0x8)
[ 3.899566] Code: e3e00015 e8bd8010 c05d88aa e92d4008 (e5900028)
[ 3.906097] ---[ end trace 38f657b10d460537 ]---
It seems that dss_mgr_check_timings is being called with a null dssdev->manager.
Other than the fact that there should be a null pointer check in the
code, it seems that this is a regression since it used to be possible
to switch the default display in this fashion. Is this no longer
allowed?
Steve
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