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1581b088fc
Changing backlight intensity on an Akita (Sharp Zaurus C-1000) triggers
WARN_ON message:
WARNING: at drivers/gpio/gpiolib.c:1672 __gpio_set_value+0x38/0xa4()
Modules linked in:
Backtrace:
corgi_bl_set_intensity+0x0/0x74
corgi_bl_update_status+0x0/0x64
corgi_lcd_probe+0x0/0x258
spi_drv_probe+0x0/0x24
driver_probe_device+0x0/0x208
__driver_attach+0x0/0x94
bus_for_each_dev+0x0/0x90
driver_attach+0x0/0x28
bus_add_driver+0x0/0x22c
driver_register+0x0/0x134
spi_register_driver+0x0/0x60
corgi_lcd_driver_init+0x0/0x1c
do_one_initcall+0x0/0x174
kernel_init+0x0/0x2a8
Akita machines have backlight controls hooked to a gpio expander chip,
max7310 using i2c transfers which can sleep. In this case,
pca953x_gpio_set_value() can be called to control gpio, and
pca953x_setup_gpio() sets can_sleep flag. Therefore,
gpio_set_value_cansleep() should be used in order to avoid WARN_ON on
akita machines.
Akita is the only exception in this case since other users of corgi_lcd
access backlight gpio controls through a different gpio expander which
does not set the can_sleep flag.
Signed-off-by: Marko Katic <dromede@gmail.com>
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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| .. | ||
| 88pm860x_bl.c | ||
| aat2870_bl.c | ||
| adp5520_bl.c | ||
| adp8860_bl.c | ||
| adp8870_bl.c | ||
| ams369fg06.c | ||
| apple_bl.c | ||
| atmel-pwm-bl.c | ||
| backlight.c | ||
| corgi_lcd.c | ||
| cr_bllcd.c | ||
| da903x_bl.c | ||
| da9052_bl.c | ||
| ep93xx_bl.c | ||
| generic_bl.c | ||
| hp680_bl.c | ||
| ili9320.c | ||
| ili9320.h | ||
| jornada720_bl.c | ||
| jornada720_lcd.c | ||
| kb3886_bl.c | ||
| Kconfig | ||
| l4f00242t03.c | ||
| lcd.c | ||
| ld9040_gamma.h | ||
| ld9040.c | ||
| lm3533_bl.c | ||
| lm3630_bl.c | ||
| lm3639_bl.c | ||
| lms283gf05.c | ||
| locomolcd.c | ||
| lp855x_bl.c | ||
| ltv350qv.c | ||
| ltv350qv.h | ||
| Makefile | ||
| max8925_bl.c | ||
| omap1_bl.c | ||
| ot200_bl.c | ||
| pandora_bl.c | ||
| pcf50633-backlight.c | ||
| platform_lcd.c | ||
| pwm_bl.c | ||
| s6e63m0_gamma.h | ||
| s6e63m0.c | ||
| tdo24m.c | ||
| tosa_bl.c | ||
| tosa_lcd.c | ||
| tps65217_bl.c | ||
| vgg2432a4.c | ||
| wm831x_bl.c | ||