[Intel-gfx] i915 driver not getting initialized properly with U-boot VESA disabled

[vinoth eswaran]

Hello,

I working on an embedded project with Minnowboard Turbot. The goal is
to have a camera application running as fast as possible (within 2
sec).

For this, I have replaced the UEFI bootloader with the U-boot (Latest
git version - uboot-x86). In u-boot I am seeing that the VGA run on
bios is taking too much time , around 2 sec.

realmode_call(addr + 0x0003, num_dev, 0xffff, 0x0000, 0xffff, 0x0,
> 0x0);  -- This function call takes more time around 2 seconds.

So I had removed the VESA config from u-boot. Now the u-boot boots up
fast, but I am facing some other issue in the i915 driver Linux
kernel. It seems that the i915 driver is not getting initialized
properly. When the Weston compositor tries to run it crashes. I have
tried to dump the VBIOS  using the following commands

echo 1 > /sys/devices/pci0000:00/0000:00:02.0/rom
cat /sys/devices/pci0000:00/0000:00:02.0/rom

and found that it is unable to access the VBIOS
 i915 0000:00:02.0: Invalid ROM contents

I think that it is due to the fact that VGA bios is not runned by the
U-boot. Is it possible to run this in linux kernel or any config in
i915 driver to support this?

or due have any idea to optimize the vga run on bios in u-boot. The
currrent time taken to run VGA bios in u-boot is unacceptable in my
case.

Any help on this is much appreciated :)

The logs with drm.debug=0x06 enabled:
[    0.218171] calling  i915_init+0x0/0x99 @ 1
[    0.220432] [drm:i915_dump_device_info] i915 device info: gen=7,
pciid=0x0f31 rev=0x11
flags=is_mobile,need_gfx_hws,is_valleyview,has_hotplug,
[    0.220566] [drm:i915_gem_gtt_init] GMADR size = 256M
[    0.220570] [drm:i915_gem_gtt_init] GTT stolen size = 64M
[    0.220574] [drm:i915_gem_gtt_init] ppgtt mode: 1
[    0.221964] i915 0000:00:02.0: Invalid ROM contents
[    0.227568] [drm:i915_gem_init_stolen] Memory reserved for graphics
device: 65536K, usable: 65536K
[    0.358545] [drm:i915_gem_setup_global_gtt] clearing unused GTT
space: [0, 7ffff000]
[    0.364276] [drm:i915_gem_context_init] HW context support initialized
[    0.364289] [drm:i915_gem_object_create_stolen] creating stolen
object: size=20000
[    0.364296] [drm:i915_pages_create_for_stolen] offset=0x0, size=131072
[    0.364405] [drm:i915_gem_object_create_stolen] creating stolen
object: size=20000
[    0.364411] [drm:i915_pages_create_for_stolen] offset=0x20000, size=131072
[    0.364463] [drm:i915_gem_object_create_stolen] creating stolen
object: size=20000
[    0.364470] [drm:i915_pages_create_for_stolen] offset=0x40000, size=131072
[    0.366181] [drm:i915_gem_object_create_stolen_for_preallocated]
creating preallocated stolen object: stolen_offset=3efa000,
gtt_offset=ffffffff, size=6000
[    0.366189] [drm:i915_pages_create_for_stolen] offset=0x3efa000, size=24576
[    0.388566] [drm:i915_redisable_vga_power_on] Something enabled VGA
plane, disabling it
[    0.452154] [drm] GMBUS [i915 gmbus vga] timed out, falling back to
bit banging on pin 2
[    0.460168] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent
adapter i915 gmbus vga
[    0.484566] [drm:i915_redisable_vga_power_on] Something enabled VGA
plane, disabling it
[    0.588705] [drm:i915_redisable_vga_power_on] Something enabled VGA
plane, disabling it
[    0.678697] i915 0000:00:02.0: No connectors reported connected with modes
[    0.678750] [drm] Initialized i915 1.6.0 20151010 for 0000:00:02.0 on minor 0
[    0.678853] initcall i915_init+0x0/0x99 returned 0 after 449419 usecs
[    0.679607] [drm:i915_gem_object_create_stolen] creating stolen
object: size=300000
[    0.679615] [drm:i915_pages_create_for_stolen] offset=0x60000, size=3145728
[    0.682422] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    2.945260] [drm:i915_gem_open]
[    3.487206] [drm:i915_redisable_vga_power_on] Something enabled VGA
plane, disabling it
[    3.507204] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent
adapter i915 gmbus vga
[    3.531477] [drm:i915_redisable_vga_power_on] Something enabled VGA
plane, disabling it
[    3.635502] [drm:i915_redisable_vga_power_on] Something enabled VGA
plane, disabling it
[    3.778482] [drm:i915_redisable_vga_power_on] Something enabled VGA
plane, disabling it
[    3.799069] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent
adapter i915 gmbus vga
[    3.822530] [drm:i915_redisable_vga_power_on] Something enabled VGA
plane, disabling it
[    3.926638] [drm:i915_redisable_vga_power_on] Something enabled VGA
plane, disabling it

Mit Freundlichen Grüßen
VinothKumar