kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-10-18 19:12:56 +00:00
Code Issues Releases Packages Activity
linux/drivers/pinctrl
History
Uwe Kleine-König a03efbf9cd pinctrl: mxs: atomically switch mux and drive strength config 
commit da6c2addf6 upstream.

To set the mux mode of a pin two bits must be set. Up to now this is
implemented using the following idiom:

	writel(mask, reg + CLR);
	writel(value, reg + SET);

. This however results in the mux mode being 0 between the two writes.

On my machine there is an IC's reset pin connected to LCD_D20. The
bootloader configures this pin as GPIO output-high (i.e. not holding the
IC in reset). When Linux reconfigures the pin to GPIO the short time
LCD_D20 is muxed as LCD_D20 instead of GPIO_1_20 is enough to confuse
the connected IC.

The same problem is present for the pin's drive strength setting which is
reset to low drive strength before using the right value.

So instead of relying on the hardware to modify the register setting
using two writes implement the bit toggling using read-modify-write.

Fixes: 17723111e6 ("pinctrl: add pinctrl-mxs support")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
[bwh: Backported to 3.16: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
History 2017-09-15 18:29:49 +01:00
..
berlin pinctrl: berlin: fix an error code in berlin_pinctrl_probe() 2014-07-05 01:15:35 +02:00
mvebu pinctrl: mvebu: armada-38x: fix incorrect total number of GPIOs 2015-07-15 10:00:30 +01:00
sh-pfc pinctrl: sh-pfc: r8a7791: Fix IPSR comment typos 2017-08-26 02:14:27 +01:00
sirf pinctrl: sirf: fix a bad conflict resolution 2014-05-30 09:52:43 +02:00
spear pinctrl: remove redundant of_match_ptr 2013-10-08 10:02:25 +02:00
sunxi pinctrl: sunxi: Fix potential null pointer dereference 2014-06-19 09:34:56 +02:00
vt8500 pinctrl: vt8500: Ensure value reg is updated when setting direction 2014-05-22 23:46:10 +02:00
core.c pinctrl: Don't just pretend to protect pinctrl_maps, do it for real 2015-05-20 13:26:16 +01:00
core.h pinctrl: Don't just pretend to protect pinctrl_maps, do it for real 2015-05-20 13:26:16 +01:00
devicetree.c pinctrl: Don't just pretend to protect pinctrl_maps, do it for real 2015-05-20 13:26:16 +01:00
devicetree.h pinctrl: core device tree mapping table parsing support 2012-04-18 13:53:10 +02:00
Kconfig pinctrl: add pinctrl driver for imx6sx 2014-05-27 11:24:28 +02:00
Makefile pinctrl: add pinctrl driver for imx6sx 2014-05-27 11:24:28 +02:00
pinconf-generic.c pinctrl: Enable "power-source" to be extracted from DT files 2014-05-28 10:16:35 +02:00
pinconf.c pinctrl: pinconf: remove warning: unused variable 'ops' 2013-12-13 13:55:15 +01:00
pinconf.h pinctrl: add function to parse generic pinconfig properties from a dt node 2013-06-16 11:57:32 +02:00
pinctrl-ab8500.c pinctrl: ab8500: Staticize some symbols 2013-04-09 09:54:00 +02:00
pinctrl-ab8505.c pinctrl: ab8505: Staticize some symbols 2013-04-09 09:59:42 +02:00
pinctrl-ab8540.c pinctrl: ab8540: Staticize some symbols 2013-04-09 09:58:02 +02:00
pinctrl-ab9540.c pinctrl: ab9540: Staticize some symbols 2013-04-09 09:55:59 +02:00
pinctrl-abx500.c mfd/pinctrl: Delete platform data header 2014-01-21 08:27:42 +00:00
pinctrl-abx500.h mfd/pinctrl: Delete platform data header 2014-01-21 08:27:42 +00:00
pinctrl-adi2-bf54x.c pinctrl: pinctrl-adi: combine multiple groups of one function together 2014-02-25 10:49:13 +01:00
pinctrl-adi2-bf60x.c pinctrl: pinctrl-adi: combine multiple groups of one function together 2014-02-25 10:49:13 +01:00
pinctrl-adi2.c pinctrl: adi2: Statize adi_gpio_irq_domain_ops 2014-04-22 08:41:35 +02:00
pinctrl-adi2.h pinctrl: pinctrl-adi: combine multiple groups of one function together 2014-02-25 10:49:13 +01:00
pinctrl-apq8064.c pinctrl: msm: Add missing sdc1 and sdc3 groups 2014-05-28 11:02:23 +02:00
pinctrl-as3722.c pinctrl: as3722: fix handling of GPIO invert bit 2014-04-22 17:04:11 +02:00
pinctrl-at91.c pinctrl/at91: Fix lockup when IRQ on PIOC and PIOD occurs 2014-05-27 11:13:10 +02:00
pinctrl-baytrail.c pinctrl: baytrail: show output gpio state correctly on Intel Baytrail 2014-11-14 15:19:54 +00:00
pinctrl-bcm281xx.c pinctrl: Rename Broadcom Capri pinctrl driver 2014-04-14 09:39:33 +02:00
pinctrl-bcm2835.c pinctrl: bcm2835: Fix memory leak in error path 2016-02-02 19:38:16 +00:00
pinctrl-coh901.c pinctrl: coh901: convert driver to use gpiolib irqchip 2014-03-26 10:31:34 +01:00
pinctrl-coh901.h pinctrl: support pinconfig on the U300 2012-03-12 22:49:03 +01:00
pinctrl-exynos.c pinctrl: exynos: Add driver data for Exynos3250 2014-04-23 09:00:25 +02:00
pinctrl-exynos.h pinctrl: exynos: Handle suspend/resume of GPIO EINT registers 2013-05-27 15:37:09 +02:00
pinctrl-exynos5440.c pinctrl: remove redundant of_match_ptr 2013-10-08 10:02:25 +02:00
pinctrl-falcon.c pinctrl: Pass all configs to driver on pin_config_set() 2013-08-28 13:34:41 +02:00
pinctrl-imx.c pinctrl: pinctrl-imx: don't use invalid value of conf_reg 2015-03-02 15:04:41 +00:00
pinctrl-imx.h pinctrl: imx: Use struct type for pins 2013-08-16 14:43:56 +02:00
pinctrl-imx1-core.c pinctrl: imx27: fix offset calculation in imx_read_2bit 2014-02-03 09:08:09 +01:00
pinctrl-imx1.h pinctrl: imx1 core driver 2013-10-29 06:54:37 -07:00
pinctrl-imx6dl.c pinctrl: remove redundant of_match_ptr 2013-10-08 10:02:25 +02:00
pinctrl-imx6q.c pinctrl: remove redundant of_match_ptr 2013-10-08 10:02:25 +02:00
pinctrl-imx6sl.c pinctrl: remove redundant of_match_ptr 2013-10-08 10:02:25 +02:00
pinctrl-imx6sx.c pinctrl: add pinctrl driver for imx6sx 2014-05-27 11:24:28 +02:00
pinctrl-imx23.c Drivers: pinctrl: remove __dev* attributes. 2013-01-03 15:57:02 -08:00
pinctrl-imx25.c pinctrl: pinctrl-imx: add imx25 pinctrl driver 2013-11-25 09:08:30 +01:00
pinctrl-imx27.c pinctrl: imx27: imx27 pincontrol driver 2013-10-29 08:58:06 -07:00
pinctrl-imx28.c Drivers: pinctrl: remove __dev* attributes. 2013-01-03 15:57:02 -08:00
pinctrl-imx35.c pinctrl: remove redundant of_match_ptr 2013-10-08 10:02:25 +02:00
pinctrl-imx50.c pinctrl: imx50: add pinctrl support code for the IMX50 SoC 2013-11-06 10:06:59 +01:00
pinctrl-imx51.c pinctrl: remove redundant of_match_ptr 2013-10-08 10:02:25 +02:00
pinctrl-imx53.c pinctrl: remove redundant of_match_ptr 2013-10-08 10:02:25 +02:00
pinctrl-ipq8064.c pinctrl: qcom: ipq8064: Fix naming convention 2014-05-29 10:37:43 +02:00
pinctrl-lantiq.c pinctrl/lantiq: Free mapping configs for both pin and groups 2013-05-15 13:28:46 +02:00
pinctrl-lantiq.h pinctrl: lantiq: Fix header file include guard 2014-04-22 08:41:35 +02:00
pinctrl-msm.c pinctrl: msm: switch to using generic GPIO irqchip helpers 2014-05-23 00:40:04 +02:00
pinctrl-msm.h pinctrl: msm: Make number of functions variable 2014-04-22 08:41:34 +02:00
pinctrl-msm8x74.c pinctrl: msm: Add more MSM8X74 pin definitions 2014-05-29 10:42:59 +02:00
pinctrl-mxs.c pinctrl: mxs: atomically switch mux and drive strength config 2017-09-15 18:29:49 +01:00
pinctrl-mxs.h pinctrl: add pinctrl-mxs support 2012-05-02 01:18:27 +02:00
pinctrl-nomadik-db8500.c pinctrl/nomadik-db8500: Fix checkpatch errors 2013-03-27 22:21:32 +01:00
pinctrl-nomadik-db8540.c Drivers: pinctrl: remove __dev* attributes. 2013-01-03 15:57:02 -08:00
pinctrl-nomadik-stn8815.c pinctrl: pinctrl-nomadik-stn8815: Fix checkpatch error 2013-03-13 19:50:20 +01:00
pinctrl-nomadik.c pinctrl: nomadik: delete stray debug print 2014-04-14 09:39:33 +02:00
pinctrl-nomadik.h pinctrl: nomadik: move platform data handling into driver 2013-11-26 21:01:58 +01:00
pinctrl-palmas.c pinctrl: palmas: remove pin config BIAS_PULL_PIN_DEFAULT support 2013-10-08 13:27:27 +02:00
pinctrl-rockchip.c pinctrl: rockchip: base regmap supplied by a syscon 2014-05-09 11:16:13 +02:00
pinctrl-s3c24xx.c pinctrl: s3c24xx: off by one in s3c24xx_eint_init() 2013-08-28 14:44:25 +02:00
pinctrl-s3c64xx.c pinctrl: s3c64xx: Fix build error caused by undefined chained_irq_enter 2013-04-23 13:59:45 +02:00
pinctrl-samsung.c pinctrl: exynos: Add driver data for Exynos3250 2014-04-23 09:00:25 +02:00
pinctrl-samsung.h pinctrl: exynos: Add driver data for Exynos3250 2014-04-23 09:00:25 +02:00
pinctrl-single.c pinctrl: single: Fix missing flush of posted write for a wakeirq 2016-08-22 22:38:17 +01:00
pinctrl-st.c pinctrl: st: Fix irqmux handler 2014-07-15 20:55:15 +02:00
pinctrl-tb10x.c pinctrl/TB10x: Fix signedness bug 2014-04-22 14:55:02 +02:00
pinctrl-tegra.c pinctrl: tegra: print better error messages 2014-04-22 16:53:43 +02:00
pinctrl-tegra.h pinctrl: tegra: add missing kerneldoc 2014-04-22 16:55:41 +02:00
pinctrl-tegra20.c pinctrl: tegra: remove fsafe from data tables 2014-04-22 16:50:24 +02:00
pinctrl-tegra30.c pinctrl: tegra: remove fsafe from data tables 2014-04-22 16:50:24 +02:00
pinctrl-tegra114.c pinctrl: tegra: remove fsafe from data tables 2014-04-22 16:50:24 +02:00
pinctrl-tegra124.c pinctrl: tegra: remove fsafe from data tables 2014-04-22 16:50:24 +02:00
pinctrl-tz1090-pdc.c pinctrl: Pass all configs to driver on pin_config_set() 2013-08-28 13:34:41 +02:00
pinctrl-tz1090.c pinctrl: Pass all configs to driver on pin_config_set() 2013-08-28 13:34:41 +02:00
pinctrl-u300.c pinctrl: Pass all configs to driver on pin_config_set() 2013-08-28 13:34:41 +02:00
pinctrl-utils.c pinctrl: utils: include export.h to avoid warnings 2013-08-28 15:50:33 +02:00
pinctrl-utils.h pinctrl: add utility functions for add map/configs 2013-08-14 21:00:41 +02:00
pinctrl-vf610.c pinctrl: remove redundant of_match_ptr 2013-10-08 10:02:25 +02:00
pinctrl-xway.c pinctrl: lantiq: remove bogus of_gpio_chip_add 2015-02-04 10:57:48 +00:00
pinmux.c pinctrl: allows not to define the get_group_pins operation 2014-04-22 14:47:02 +02:00
pinmux.h pinctrl: ifdef CONFIG_DEBUG_FS cleanup 2012-04-18 13:53:12 +02:00