On Mon, 2015-06-29 at 19:28 +0300, Irina Tirdea wrote: > After power on, it is recommended that the driver resets the device. > The reset procedure timing is described in the datasheet and is used > at device init (before writing device configuration) and > for power management. It is a sequence of setting the interrupt > and reset pins high/low at specific timing intervals. This procedure > also includes setting the slave address to the one specified in the > ACPI/device tree. > > This is based on Goodix datasheets for GT911 and GT9271 and on Goodix > driver gt9xx.c for Android (publicly available in Android kernel > trees for various devices). > > For reset the driver needs to control the interrupt and > reset gpio pins (configured through ACPI/device tree). For devices > that do not have the gpio pins declared, the functionality depending > on these pins will not be available, but the device can still be used > with basic functionality. I'm having a little trouble with this first patch, on a 4.2 "pre" Linus tree and on a 4.1 kernel. [ 6.720214] ------------[ cut here ]------------ [ 6.720230] WARNING: CPU: 2 PID: 475 at drivers/pinctrl/intel/pinctrl-baytrail.c:338 byt_gpio_direction_output+0x97/0xa0() [ 6.720234] Potential Error: Setting GPIO with direct_irq_en to output [ 6.720238] Modules linked in: [ 6.720241] regmap_i2c intel_soc_dts_iosf int340x_thermal_zone soundcore industrialio battery iosf_mbi acpi_thermal_rel dell_smo8800 snd_soc_sst_acpi goodix_backport(OE+) i2c_hid acpi_pad ac rfkill_gpio i2c_designware_platform rfkill pwm_lpss_platform pwm_lpss i2c_designware_core nfsd auth_rpcgss nfs_acl lockd grace sunrpc i915 mmc_block i2c_algo_bit drm_kms_helper drm video sdhci_acpi sdhci mmc_core [ 6.720292] CPU: 2 PID: 475 Comm: systemd-udevd Tainted: G W OE 4.2.0-0.rc0.git2.2.fc22.i686 #1 [ 6.720295] Hardware name: To be filled by O.E.M. To be filled by O.E.M./Aptio CRB, BIOS 5.6.5 07/25/2014 [ 6.720299] c0d39967 11197204 00000000 f6d37bc8 c0a9ce3c f6d37c08 f6d37bf8 c045c677 [ 6.720311] c0cb62a4 f6d37c28 000001db c0cb62e0 00000152 c073bfc7 c073bfc7 f7c580b8 [ 6.720321] f441409c f7c580b0 f6d37c14 c045c6ee 00000009 f6d37c08 c0cb62a4 f6d37c28 [ 6.720331] Call Trace: [ 6.720342] [<c0a9ce3c>] dump_stack+0x41/0x52 [ 6.720349] [<c045c677>] warn_slowpath_common+0x87/0xc0 [ 6.720355] [<c073bfc7>] ? byt_gpio_direction_output+0x97/0xa0 [ 6.720360] [<c073bfc7>] ? byt_gpio_direction_output+0x97/0xa0 [ 6.720365] [<c045c6ee>] warn_slowpath_fmt+0x3e/0x60 [ 6.720370] [<c073bfc7>] byt_gpio_direction_output+0x97/0xa0 [ 6.720376] [<c073bf30>] ? byt_gpio_irq_handler+0xc0/0xc0 [ 6.720382] [<c073e939>] _gpiod_direction_output_raw+0x59/0x1c0 [ 6.720388] [<c0aa202d>] ? _raw_spin_unlock_irqrestore+0xd/0x10 [ 6.720393] [<c073bb73>] ? byt_gpio_direction_input+0x43/0x50 [ 6.720398] [<c073bb30>] ? byt_gpio_set+0x70/0x70 [ 6.720404] [<c073eb0a>] gpiod_direction_output+0x2a/0x50 [ 6.720413] [<f7fe768b>] goodix_ts_probe+0x2fb/0x5fd [goodix_backport] [ 6.720422] [<c0909691>] i2c_device_probe+0x101/0x1b0 [ 6.720428] [<c0612e95>] ? sysfs_create_link+0x25/0x50 [ 6.720436] [<f7fe7390>] ? goodix_ts_irq_handler+0x1f0/0x1f0 [goodix_backport] [ 6.720442] [<c0819c52>] ? driver_sysfs_add+0x62/0x80 [ 6.720448] [<c081a56a>] driver_probe_device+0x1ca/0x460 [ 6.720454] [<c081a800>] ? driver_probe_device+0x460/0x460 [ 6.720461] [<c078d0b1>] ? acpi_driver_match_device+0x36/0x3f [ 6.720467] [<c081a879>] __driver_attach+0x79/0x80 [ 6.720473] [<c081a800>] ? driver_probe_device+0x460/0x460 [ 6.720478] [<c0818467>] bus_for_each_dev+0x57/0xa0 [ 6.720484] [<c0819dfe>] driver_attach+0x1e/0x20 [ 6.720489] [<c081a800>] ? driver_probe_device+0x460/0x460 [ 6.720494] [<c08199bf>] bus_add_driver+0x1ef/0x290 [ 6.720501] [<f7ca7000>] ? 0xf7ca7000 [ 6.720506] [<f7ca7000>] ? 0xf7ca7000 [ 6.720512] [<c081b07d>] driver_register+0x5d/0xf0 [ 6.720518] [<c090a3ca>] i2c_register_driver+0x2a/0xa0 [ 6.720524] [<c040046f>] ? do_one_initcall+0x9f/0x200 [ 6.720531] [<f7ca7012>] goodix_ts_driver_init+0x12/0x1000 [goodix_backport] [ 6.720536] [<c040047a>] do_one_initcall+0xaa/0x200 [ 6.720541] [<f7ca7000>] ? 0xf7ca7000 [ 6.720547] [<c05801c8>] ? free_vmap_area_noflush+0x38/0x80 [ 6.720554] [<c0594b95>] ? kmem_cache_alloc_trace+0x175/0x1f0 [ 6.720560] [<c0a9c64f>] ? do_init_module+0x21/0x1a1 [ 6.720565] [<c0a9c64f>] ? do_init_module+0x21/0x1a1 [ 6.720572] [<c0a9c67e>] do_init_module+0x50/0x1a1 [ 6.720578] [<c04d917b>] load_module+0x1ceb/0x22f0 [ 6.720585] [<c04d6159>] ? copy_module_from_fd.isra.47+0xf9/0x190 [ 6.720592] [<c04d99a5>] SyS_finit_module+0xa5/0xf0 [ 6.720598] [<c056490b>] ? vm_mmap_pgoff+0x9b/0xc0 [ 6.720605] [<c0aa26df>] sysenter_do_call+0x12/0x12 [ 6.720610] ---[ end trace d5183b3e60f0f675 ]--- -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
