No /dev/fb0 created for omapdrm in current Linux next

Hi Tomi,

Looks like omapdrm won't show anything with current Linux next based on my test with 900:

modprobe twl4030_keypad
modprobe tsc2005
modprobe omapdss
modprobe panel_sony_acx565akm
modprobe omapdrm

echo 255 > /sys/class/backlight/acx565akm/brightness echo 0 > /sys/class/graphics/fb0/blank
echo 1 > /sys/class/graphics/fb0/blank
echo 0 > /sys/class/graphics/fb0/blank

# ls -l /dev/fb*
ls: cannot access '/dev/fb*': No such file or directory

Regards,

Tony
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What does the bootlog say?

I tried x15 on next. I see

BUG: using smp_processor_id() in preemptible [00000000] code: swapper/0/1

and

WARNING: possible circular locking dependency detected

But I don't think those affect DSS.

I see cma allocs failing for many drivers:

cma: cma_alloc: alloc failed, req-size: 1 pages, ret: -16

Which obviously breaks dss...

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It seems to be also happening with current -rc kernels, adding Aaro to Cc.

Not much anything interesting:

twl_rtc 48070000.i2c:twl@48:rtc: Power up reset detected.
twl_rtc 48070000.i2c:twl@48:rtc: Enabling TWL-RTC
twl_rtc 48070000.i2c:twl@48:rtc: rtc core: registered 48070000.i2c:twl@48:rtc as rtc0
input: TWL4030 Keypad as /devices/platform/68000000.ocp/48070000.i2c/i2c-1/1-0048/48070000.i2c:twl@48:keypad/input/input0 tsc2005 spi0.0: GPIO lookup for consumer reset
tsc2005 spi0.0: using device tree for GPIO lookup
of_get_named_gpiod_flags: parsed 'reset-gpios' property of node '/ocp@68000000/spi@48098000/tsc2005@0[0]' - status (0)
input: TSC2005 touchscreen as /devices/platform/68000000.ocp/48098000.spi/spi_master/spi0/spi0.0/input/input1 omapdss_dss 48050000.dss: 48050000.dss supply vdda_video not found, using dummy regulator
DSS: OMAP DSS rev 2.0
omapdss_dss 48050000.dss: bound 48050400.dispc (ops dispc_component_ops [omapdss])
omapdss_dss 48050000.dss: bound 48050c00.encoder (ops venc_component_ops [omapdss])
of_get_named_gpiod_flags: parsed 'reset-gpios' property of node '/ocp@68000000/spi@48098000/acx565akm@2[0]' - status (0) acx565akm spi0.2: omapfb: acx565akm rev 8b LCD detected

No output from drm though with the modules loaded:

# lsmod
Module                  Size  Used by
omapdrm                69632  0
drm_kms_helper        163840  1 omapdrm
cfbfillrect            16384  1 drm_kms_helper
syscopyarea            16384  1 drm_kms_helper
cfbimgblt              16384  1 drm_kms_helper
sysfillrect            16384  1 drm_kms_helper
sysimgblt              16384  1 drm_kms_helper
fb_sys_fops            16384  1 drm_kms_helper
cfbcopyarea            16384  1 drm_kms_helper
drm                   364544  2 omapdrm,drm_kms_helper
panel_sony_acx565akm    16384  0
omapdss               192512  1
omapdss_base           24576  3 panel_sony_acx565akm,omapdrm,omapdss
tsc2005                16384  0
tsc200x_core           16384  1 tsc2005
twl4030_keypad         16384  0
matrix_keymap          16384  1 twl4030_keypad
rtc_twl                16384  1
twl4030_wdt            16384  0

Am I missing some module now?

Yeah things seem quite broken in next again :( That cma_alloc issue is caused by commit c11a39772b51 ("mm: drop migrate type checks from has_unmovable_pages") and has a fix being discussed at:

https://patchwork.kernel.org/patch/10016595/

But this n900 issue seems to be something different.

Regards,

Tony
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omapdrm takes a ref to the panel module when it's in use, and panel_sony_acx565akm has refcount of 0. So for some reason the display setup has not been done, or it's been deferred.

I think you're missing connector_analog_tv
(CONFIG_DRM_OMAP_CONNECTOR_ANALOG_TV).

I just tried beagleboard, it seems to work ok on next.

Tomi

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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Sorry for the delay in replying, finally got around to trying this again.

Your are totally right, connector_analog_tv needs to be loaded.

My updated test script below for reference.

Regards,

Tony

8< ------------------------
#!/bin/sh

modprobe twl4030_keypad
modprobe tsc2005
modprobe omapdss
modprobe panel_sony_acx565akm
modprobe connector_analog_tv
modprobe omapdrm

echo 255 > /sys/class/backlight/acx565akm/brightness echo 0 > /sys/class/graphics/fb0/blank
echo 1 > /sys/class/graphics/fb0/blank
echo 0 > /sys/class/graphics/fb0/blank

/sbin/agetty --noclear tty1 linux &
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