Re: Fwd: Barebox 2017.02 works great but no Linux Framebuffer... :-/

[Lucas Stach <l.stach@pengutronix.de>]

Am Montag, den 26.06.2017, 10:40 +0200 schrieb gianluca:
> On 06/23/2017 11:45 AM, gianluca wrote:
> > On 06/21/2017 05:30 PM, Lucas Stach wrote:
> > > > As you can see imx-drm.legacy_depth=32 is passed to the kernel
> > > > from
> > > > bootloader.
> > > 
> > > The module is called "imxdrm" without a dash, so the correct way
> > > to
> > > specify the parameter on the command line is
> > > "imxdrm.legacyfb_depth=32".
> > 
> > It works now, the culprit was the name of the driver: imxdrm is the
> > right one.
> > 
> 
> In Barebox everything looks like good. Both boards are running quite 
> well and all stuff are working as expected.
> In Linux I have some strange beahviours.
> 
> If I replace the bootloader and the device-tree on the microSD card
> (the 
> Linux kernel and the rootfilesystem remains the same) the
> iMX6QuadPlus 
> refuses to use the framebuffer.
> 
> Frankly, I do not understand how those drivers react differently if
> they 
> are running on the DualLite or the QuadPlus.
> 
> The main differences in the device-tree are (for Barebox point of
> view):
> > 
> > diff -Nru imx6dl-eurek-ek360.dts imx6qp-eurek-ek360.dts
> > --- imx6dl-eurek-ek360.dts	2017-06-21 12:22:32.000000000
> > +0200
> > +++ imx6qp-eurek-ek360.dts	2017-06-21 13:46:35.000000000
> > +0200
> > @@ -1,5 +1,5 @@
> >  /*
> > - * $Id: imx6dl-eurek-ek360.dts,v 1.4 2017/06/21 10:22:32 gianluca
> > Exp $
> > + * $Id: imx6qp-eurek-ek360.dts,v 1.5 2017/06/21 11:46:35 gianluca
> > Exp $
> >   *
> >   * Copyright 2016/2017 Gianluca Renzi, Eurek Elettronica S.R.L.
> >   * Copyright 2014 Raphaël Poggi
> > @@ -18,13 +18,13 @@
> > 
> >  #include <dt-bindings/gpio/gpio.h>
> >  #include <dt-bindings/input/input.h>
> > -#include <arm/imx6qdl.dtsi>
> > -#include <arm/imx6dl.dtsi>
> > -#include "imx6dl.dtsi"
> > +#include <arm/imx6qp.dtsi>
> > +#include "imx6qdl.dtsi"
> > +#include "imx6q.dtsi"
> > 
> >  / {
> > -	model = "Eurek EK360 i.MX6DL";
> > -	compatible = "eurek,ek360", "fsl,imx6dl";
> > +	model = "Eurek EK360 i.MX6QP";
> > +	compatible = "eurek,ek360", "fsl,imx6qp";
> > 
> >  	chosen {
> >  		linux,stdout-path = &uart3;
> 
> Just a matter of include and a compatible property line...
> 
> Of course the flash header and memory initializers are still
> different 
> for both processors (NoC and other stuff).
> 
> In Linux the only thing wich differs is the device-tree file (more
> or 
> less like in Barebox):
> 
> > --- linux-4.9.7-EK360-EK360DL-dts.patch	2017-06-21
> > 12:42:00.944833220 +0200
> > +++ linux-4.9.7-EK360-EK360QP-dts.patch	2017-06-22
> > 17:29:24.634534659 +0200
> > @@ -1,8 +1,8 @@
> > ---- a/arch/arm/boot/dts/imx6dl-eurek-ek360.dts	1970-01-01
> > 01:00:00.000000000 +0100
> > -+++ b/arch/arm/boot/dts/imx6dl-eurek-ek360.dts	2017-06-21
> > 12:42:00.412833238 +0200
> > +--- a/arch/arm/boot/dts/imx6qp-eurek-ek360.dts	1970-01-01
> > 01:00:00.000000000 +0100
> > ++++ b/arch/arm/boot/dts/imx6qp-eurek-ek360.dts	2017-06-22
> > 17:29:24.634534659 +0200
> >  @@ -0,0 +1,626 @@
> >  +/*
> > -+ * $Id: imx6dl-eurek-ek360.dts,v 1.4 2017/06/21 10:22:32 gianluca
> > Exp $
> > ++ * $Id: imx6qp-eurek-ek360.dts,v 1.5 2017/06/21 11:46:35 gianluca
> > Exp $
> >  + *
> >  + * Copyright 2016/2017 Gianluca Renzi, Eurek Elettronica S.R.L.
> >  + * Copyright 2014 Raphaël Poggi
> > @@ -21,13 +21,13 @@
> >  +
> >  +#include <dt-bindings/gpio/gpio.h>
> >  +#include <dt-bindings/input/input.h>
> > -+/* #include <arm/imx6qdl.dtsi> */
> > -+#include "imx6qdl.dtsi"
> > -+#include "imx6dl.dtsi"
> > ++/* #include <arm/imx6qp.dtsi> */
> > ++/* #include "imx6qdl.dtsi" */
> > ++#include "imx6qp.dtsi"
> >  +
> >  +/ {
> > -+	model = "Eurek EK360 i.MX6DL";
> > -+	compatible = "eurek,ek360", "fsl,imx6dl";
> > ++	model = "Eurek EK360 i.MX6QP";
> > ++	compatible = "eurek,ek360", "fsl,imx6qp";
> >  +
> >  +	chosen {
> >  +		linux,stdout-path = &uart3;
> 
> The DuaLite has those includes:
> 
> #include <dt-bindings/gpio/gpio.h>
> #include <dt-bindings/input/input.h>
> /* #include <arm/imx6qdl.dtsi> */
> #include "imx6qdl.dtsi"
> #include "imx6dl.dtsi"
> 
> and the compatible string is: compatible = "eurek,ek360",
> "fsl,imx6dl"
> 
> The QuadPlus has those includes:
> 
> #include <dt-bindings/gpio/gpio.h>
> #include <dt-bindings/input/input.h>
> /* #include <arm/imx6qp.dtsi> */
> /* #include "imx6qdl.dtsi" */
> #include "imx6qp.dtsi"
> 
> and the compatible string is: compatible = "eurek,ek360",
> "fsl,imx6qp"
> 
> During boot I can see no output on the framebuffer on the QuadPlus
> and 
> the kernel log have those messages:
> 
> > [    4.914737] ------------[ cut here ]------------
> > [    4.914769] WARNING: CPU: 1 PID: 17 at
> > drivers/gpu/drm/drm_atomic_helper.c:1140
> > drm_atomic_helper_wait_for_vblanks+0x258/0x25c
> > [    4.914772] [CRTC:24] vblank wait timed out
> > [    4.914846] Modules linked in: evdev joydev rfkill at24
> > nvmem_imx_ocotp ci_hdrc_imx nvmem_core sx8656_ek(O) ci_hdrc
> > udc_core ehci_hcd usbcore usbmisc_imx coda phy_mxs_usb v4l2_mem2mem
> > panel_simple videobuf2_v4l2 imx_thermal videobuf2_dma_contig
> > imx2_wdt videobuf2_core snd_soc_fsl_asrc flexcan can_dev
> > videobuf2_vmalloc snd_soc_fsl_asoc_card videobuf2_memops pwm_bl
> > pwm_imx snd_ac97_codec backlight leds_gpio
> > [    4.914856] CPU: 1 PID: 17 Comm: kworker/1:0 Tainted:
> > G           O    4.9.7-EK20170623 #1
> > [    4.914859] Hardware name: Freescale i.MX6 Quad/DualLite (Device
> > Tree)
> > [    4.914875] Workqueue: events deferred_probe_work_func
> > [    4.914900] [<c0115354>] (unwind_backtrace) from [<c010e414>]
> > (show_stack+0x20/0x24)
> > [    4.914915] [<c010e414>] (show_stack) from [<c04716f8>]
> > (dump_stack+0x94/0xb0)
> > [    4.914927] [<c04716f8>] (dump_stack) from [<c014cd8c>]
> > (__warn+0xf8/0x110)
> > [    4.914937] [<c014cd8c>] (__warn) from [<c014ce74>]
> > (warn_slowpath_fmt+0x48/0x50)
> > [    4.914951] [<c014ce74>] (warn_slowpath_fmt) from [<c05ca298>]
> > (drm_atomic_helper_wait_for_vblanks+0x258/0x25c)
> > [    4.914970] [<c05ca298>] (drm_atomic_helper_wait_for_vblanks)
> > from [<c05f6ef4>] (imx_drm_atomic_commit_tail+0x58/0x68)
> > [    4.914982] [<c05f6ef4>] (imx_drm_atomic_commit_tail) from
> > [<c05cac64>] (commit_tail+0x50/0x6c)
> > [    4.914992] [<c05cac64>] (commit_tail) from [<c05cb890>]
> > (drm_atomic_helper_commit+0xa4/0xe4)
> > [    4.915003] [<c05cb890>] (drm_atomic_helper_commit) from
> > [<c05f7008>] (imx_drm_atomic_commit+0x104/0x130)
> > [    4.915021] [<c05f7008>] (imx_drm_atomic_commit) from
> > [<c05ec25c>] (drm_atomic_commit+0x5c/0x68)
> > [    4.915038] [<c05ec25c>] (drm_atomic_commit) from [<c05cf358>]
> > (restore_fbdev_mode+0x158/0x298)
> > [    4.915051] [<c05cf358>] (restore_fbdev_mode) from [<c05cf6bc>]
> > (drm_fb_helper_restore_fbdev_mode_unlocked+0x40/0x84)
> > [    4.915063] [<c05cf6bc>]
> > (drm_fb_helper_restore_fbdev_mode_unlocked) from [<c05cf578>]
> > (drm_fb_helper_set_par+0x40/0x6c)
> > [    4.915076] [<c05cf578>] (drm_fb_helper_set_par) from
> > [<c04fe008>] (fbcon_init+0x4b4/0x4f8)
> > [    4.915088] [<c04fe008>] (fbcon_init) from [<c05876e0>]
> > (visual_init+0xd4/0x11c)
> > [    4.915102] [<c05876e0>] (visual_init) from [<c05898b4>]
> > (do_bind_con_driver+0x14c/0x334)
> > [    4.915112] [<c05898b4>] (do_bind_con_driver) from [<c0589bec>]
> > (do_take_over_console+0x150/0x1b4)
> > [    4.915121] [<c0589bec>] (do_take_over_console) from
> > [<c04fe0d4>] (do_fbcon_takeover+0x88/0xe8)
> > [    4.915130] [<c04fe0d4>] (do_fbcon_takeover) from [<c04feda8>]
> > (fbcon_event_notify+0x7c0/0x7f8)
> > [    4.915142] [<c04feda8>] (fbcon_event_notify) from [<c016f57c>]
> > (notifier_call_chain+0x54/0x94)
> > [    4.915153] [<c016f57c>] (notifier_call_chain) from [<c016f88c>]
> > (__blocking_notifier_call_chain+0x58/0x70)
> > [    4.915164] [<c016f88c>] (__blocking_notifier_call_chain) from
> > [<c016f8cc>] (blocking_notifier_call_chain+0x28/0x30)
> > [    4.915175] [<c016f8cc>] (blocking_notifier_call_chain) from
> > [<c0504d5c>] (fb_notifier_call_chain+0x2c/0x30)
> > [    4.915187] [<c0504d5c>] (fb_notifier_call_chain) from
> > [<c0506b10>] (register_framebuffer+0x1f8/0x2b0)
> > [    4.915200] [<c0506b10>] (register_framebuffer) from
> > [<c05cf960>] (drm_fb_helper_initial_config+0x260/0x408)
> > [    4.915212] [<c05cf960>] (drm_fb_helper_initial_config) from
> > [<c05d00a0>] (drm_fbdev_cma_init_with_funcs+0x90/0x110)
> > [    4.915223] [<c05d00a0>] (drm_fbdev_cma_init_with_funcs) from
> > [<c05d0148>] (drm_fbdev_cma_init+0x28/0x30)
> > [    4.915236] [<c05d0148>] (drm_fbdev_cma_init) from [<c05f7180>]
> > (imx_drm_bind+0x104/0x194)
> > [    4.915254] [<c05f7180>] (imx_drm_bind) from [<c061b780>]
> > (try_to_bring_up_master+0x234/0x294)
> > [    4.915266] [<c061b780>] (try_to_bring_up_master) from
> > [<c061b8a0>] (component_add+0xc0/0x158)
> > [    4.915277] [<c061b8a0>] (component_add) from [<c05fa178>]
> > (ipu_drm_probe+0x68/0x74)
> > [    4.915291] [<c05fa178>] (ipu_drm_probe) from [<c0622e90>]
> > (platform_drv_probe+0x60/0xc0)
> > [    4.915304] [<c0622e90>] (platform_drv_probe) from [<c0620ce4>]
> > (driver_probe_device+0x238/0x428)
> > [    4.915314] [<c0620ce4>] (driver_probe_device) from [<c0621230>]
> > (__device_attach_driver+0xac/0x10c)
> > [    4.915324] [<c0621230>] (__device_attach_driver) from
> > [<c061ec18>] (bus_for_each_drv+0x54/0x9c)
> > [    4.915335] [<c061ec18>] (bus_for_each_drv) from [<c06209a8>]
> > (__device_attach+0xb0/0x134)
> > [    4.915344] [<c06209a8>] (__device_attach) from [<c06212ac>]
> > (device_initial_probe+0x1c/0x20)
> > [    4.915354] [<c06212ac>] (device_initial_probe) from
> > [<c061fdb8>] (bus_probe_device+0x94/0x9c)
> > [    4.915364] [<c061fdb8>] (bus_probe_device) from [<c0620290>]
> > (deferred_probe_work_func+0x7c/0xc8)
> > [    4.915377] [<c0620290>] (deferred_probe_work_func) from
> > [<c01679dc>] (process_one_work+0x14c/0x440)
> > [    4.915386] [<c01679dc>] (process_one_work) from [<c0167d6c>]
> > (worker_thread+0x54/0x504)
> > [    4.915398] [<c0167d6c>] (worker_thread) from [<c016de48>]
> > (kthread+0xf0/0x108)
> > [    4.915415] [<c016de48>] (kthread) from [<c0109cf8>]
> > (ret_from_fork+0x14/0x3c)
> > [    4.915419] ---[ end trace 64ae59d2b69cc4d3 ]---
> > 
> 
> and after a while:
> 
> > [   15.102758] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR*
> > [CRTC:24:crtc-0] flip_done timed out
> > [   25.342746] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR*
> > [CRTC:24:crtc-0] flip_done timed out
> > [   25.358582] Console: switching to colour frame buffer device
> > 160x50
> > [   35.582744] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR*
> > [CRTC:24:crtc-0] flip_done timed out
> > [   36.214243] imx-drm display-subsystem: fb0:  frame buffer device
> > [   46.334758] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR*
> > [CRTC:24:crtc-0] flip_done timed out
> > [   56.574757] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR*
> > [CRTC:24:crtc-0] flip_done timed out
> > [   66.814751] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR*
> > [CRTC:24:crtc-0] flip_done timed out
> > [   77.054740] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR*
> > [CRTC:24:crtc-0] flip_done timed out
> > [   87.294748] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR*
> > [CRTC:24:crtc-0] flip_done timed out
> > [   97.534744] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR*
> > [CRTC:24:crtc-0] flip_done timed out
> > [  107.774751] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR*
> > [CRTC:24:crtc-0] flip_done timed out
> > [  118.014750] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR*
> > [CRTC:24:crtc-0] flip_done timed out
> 
> On both board the kernel cmd line is:
> > ~# cat /proc/cmdline
> > console=ttymxc2,115200 rootwait noswap ip=none noinitrd
> > rootfstype=nilfs2 root=/dev/mmcblk1p3
> > fec.macaddr=0x7a,0x3f,0x03,0xe3,0xa2,0xff system_rev=0xe3600000
> > system_serialnr=0x00000000 lcd_type=am1280800n3tz fastboot
> > imxdrm.legacyfb_depth=32
> 
> Any help?

Your kernel is too old. Full support for the QuadPlus is a really
recent addition. Either update your kernel to 4.12-rc, or add
"clk_ignore_unused" to get at least basic functionality working.

Regards,
Lucas

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