Hi Linus, Den 27.08.2018 14.12, skrev Linus Walleij:
Hi folks, I'm seeing this on all PL111 systems (several ARM reference designs and Nomadik) with v4.19-rc1: [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [drm] No driver support for vblank timestamp query. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1 at ../include/linux/dma-mapping.h:516 drm_gem_cma_create+0x13c/0x158 Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 4.18.0+ #135 Hardware name: ARM-Versatile (Device Tree Support) [<c001c4e0>] (unwind_backtrace) from [<c0019198>] (show_stack+0x10/0x14) [<c0019198>] (show_stack) from [<c0024528>] (__warn+0xcc/0xf4) [<c0024528>] (__warn) from [<c0024664>] (warn_slowpath_null+0x3c/0x48) [<c0024664>] (warn_slowpath_null) from [<c0259710>] (drm_gem_cma_create+0x13c/0x158) [<c0259710>] (drm_gem_cma_create) from [<c0234700>] (drm_fbdev_cma_create+0x58/0x248) [<c0234700>] (drm_fbdev_cma_create) from [<c0233d3c>] (__drm_fb_helper_initial_config_and_unlock+0x1c8/0x450) [<c0233d3c>] (__drm_fb_helper_initial_config_and_unlock) from [<c023450c>] (drm_fb_cma_fbdev_init_with_funcs+0x8c/0x114) [<c023450c>] (drm_fb_cma_fbdev_init_with_funcs) from [<c025d23c>] (pl111_amba_probe+0x3c8/0x4a4) [<c025d23c>] (pl111_amba_probe) from [<c01f3c64>] (amba_probe+0xd8/0x154) [<c01f3c64>] (amba_probe) from [<c02637e4>] (driver_probe_device+0x25c/0x310) [<c02637e4>] (driver_probe_device) from [<c0263968>] (__driver_attach+0xd0/0xd4) [<c0263968>] (__driver_attach) from [<c0261b30>] (bus_for_each_dev+0x70/0xb4) [<c0261b30>] (bus_for_each_dev) from [<c0262c74>] (bus_add_driver+0x170/0x204) [<c0262c74>] (bus_add_driver) from [<c0264278>] (driver_register+0x74/0x108) [<c0264278>] (driver_register) from [<c000abf8>] (do_one_initcall+0x48/0x1a0) [<c000abf8>] (do_one_initcall) from [<c04fedc0>] (kernel_init_freeable+0x104/0x1c4) [<c04fedc0>] (kernel_init_freeable) from [<c03e0f04>] (kernel_init+0x8/0xf0) [<c03e0f04>] (kernel_init) from [<c00090e0>] (ret_from_fork+0x14/0x34) Exception stack(0xc781ffb0 to 0xc781fff8) ffa0: 00000000 00000000 00000000 00000000 ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 ffe0: 00000000 00000000 00000000 00000000 00000013 00000000 ---[ end trace 63124893aa47fae0 ]--- drm-clcd-pl111 dev:20: coherent DMA mask is unset drm-clcd-pl111 dev:20: [drm:drm_fb_cma_fbdev_init_with_funcs] *ERROR* Failed to set fbdev configuration. [drm] Initialized pl111 1.0.0 20170317 for dev:20 on minor 0 I am trying to bisect but it is really painful because the kernel simply does not compile on a lot of bisect points :(
This is one suspect: 894a677f4b3e drm/cma-helper: Use the generic fbdev emulation Noralf.
Any hints? Eric is PL111 working for you? Yours, Linus Walleij
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