On Thursday, September 20, 2018 12:11:48 PM CEST Marek Szyprowski wrote: > Hi All, > > On 2018-09-02 14:01, Janusz Krzysztofik wrote: > > Certain GPIO descriptor arrays returned by gpio_get_array() may contain > > information on direct mapping of array members to pins of a single GPIO > > chip in hardware order. In such cases, bitmaps of values can be passed > > directly from/to the chip's .get/set_multiple() callbacks without > > wasting time on iterations. > > > > Add respective code to gpiod_get/set_array_bitmap_complex() functions. > > Pins not applicable for fast path are processed as before, skipping > > over the 'fast' ones. > > > > Cc: Jonathan Corbet <corbet@xxxxxxx> > > Signed-off-by: Janusz Krzysztofik <jmkrzyszt@xxxxxxxxx> > > I've just noticed that this patch landed in today's linux-next. Sadly it > breaks booting of Exynos5250-based Samsung Snow Chromebook (ARM 32bit, > device-tree source arch/arm/boot/dts/exynos5250-snow.dts). > > Booting hangs after detecting MMC cards. Reverting this patch fixes the > boot. I will try later to add some debugs and investigate it further what > really happens when booting hangs. Hi Marek, Thanks for reporting. Could you please try the following fix? Thanks, Janusz >From d7ecd435bfb4972766b63ac383a43875700c7452 Mon Sep 17 00:00:00 2001 From: Janusz Krzysztofik <jmkrzyszt@xxxxxxxxx> Date: Thu, 20 Sep 2018 17:37:21 +0200 Subject: [PATCH] gpiolib: Fix bitmap index not updated While skipping fast path bits, bitmap index is not updated with next found zero bit position. Fix it. Signed-off-by: Janusz Krzysztofik <jmkrzyszt@xxxxxxxxx> --- drivers/gpio/gpiolib.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index a53d17745d21..5bc3447949c9 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -2880,7 +2880,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep, __set_bit(hwgpio, mask); if (array_info) - find_next_zero_bit(array_info->get_mask, + i = find_next_zero_bit(array_info->get_mask, array_size, i); else i++; @@ -2905,7 +2905,8 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep, trace_gpio_value(desc_to_gpio(desc), 1, value); if (array_info) - find_next_zero_bit(array_info->get_mask, i, j); + i = find_next_zero_bit(array_info->get_mask, i, + j); else j++; } @@ -3192,7 +3193,7 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep, } if (array_info) - find_next_zero_bit(array_info->set_mask, + i = find_next_zero_bit(array_info->set_mask, array_size, i); else i++; -- 2.16.4
