summaryrefslogtreecommitdiff
path: root/drivers/gpio
diff options
context:
space:
mode:
authorLinus Walleij <linus.walleij@linaro.org>2018-01-16 09:51:51 +0100
committerLinus Walleij <linus.walleij@linaro.org>2018-01-16 23:42:36 +0100
commit07c7b6a52503ac13ae357a8b3ef3456590a64b65 (patch)
treef141127f3a64737257a7b0e4a4933f1263f8fe7e /drivers/gpio
parenta8750ddca918032d6349adbf9a4b6555e7db20da (diff)
gpio: mmio: Also read bits that are zero
The code for .get_multiple() has bugs: 1. The simple .get_multiple() just reads a register, masks it and sets the return value. This is not correct: we only want to assign values (whether 0 or 1) to the bits that are set in the mask. Fix this by using &= ~mask to clear all bits in the mask and then |= val & mask to set the corresponding bits from the read. 2. The bgpio_get_multiple_be() call has a similar problem: it uses the |= operator to set the bits, so only the bits in the mask are affected, but it misses to clear all returned bits from the mask initially, so some bits will be returned erroneously set to 1. 3. The bgpio_get_set_multiple() again fails to clear the bits from the mask. 4. find_next_bit() wasn't handled correctly, use a totally different approach for one function and change the other function to follow the design pattern of assigning the first bit to -1, then use bit + 1 in the for loop and < num_iterations as break condition. Fixes: 80057cb417b2 ("gpio-mmio: Use the new .get_multiple() callback") Cc: Bartosz Golaszewski <brgl@bgdev.pl> Reported-by: Clemens Gruber <clemens.gruber@pqgruber.com> Tested-by: Clemens Gruber <clemens.gruber@pqgruber.com> Reported-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpio-mmio.c30
1 files changed, 16 insertions, 14 deletions
diff --git a/drivers/gpio/gpio-mmio.c b/drivers/gpio/gpio-mmio.c
index f9042bcc27a4..7b14d6280e44 100644
--- a/drivers/gpio/gpio-mmio.c
+++ b/drivers/gpio/gpio-mmio.c
@@ -152,14 +152,13 @@ static int bgpio_get_set_multiple(struct gpio_chip *gc, unsigned long *mask,
{
unsigned long get_mask = 0;
unsigned long set_mask = 0;
- int bit = 0;
- while ((bit = find_next_bit(mask, gc->ngpio, bit)) != gc->ngpio) {
- if (gc->bgpio_dir & BIT(bit))
- set_mask |= BIT(bit);
- else
- get_mask |= BIT(bit);
- }
+ /* Make sure we first clear any bits that are zero when we read the register */
+ *bits &= ~*mask;
+
+ /* Exploit the fact that we know which directions are set */
+ set_mask = *mask & gc->bgpio_dir;
+ get_mask = *mask & ~gc->bgpio_dir;
if (set_mask)
*bits |= gc->read_reg(gc->reg_set) & set_mask;
@@ -176,13 +175,13 @@ static int bgpio_get(struct gpio_chip *gc, unsigned int gpio)
/*
* This only works if the bits in the GPIO register are in native endianness.
- * It is dirt simple and fast in this case. (Also the most common case.)
*/
static int bgpio_get_multiple(struct gpio_chip *gc, unsigned long *mask,
unsigned long *bits)
{
-
- *bits = gc->read_reg(gc->reg_dat) & *mask;
+ /* Make sure we first clear any bits that are zero when we read the register */
+ *bits &= ~*mask;
+ *bits |= gc->read_reg(gc->reg_dat) & *mask;
return 0;
}
@@ -196,9 +195,12 @@ static int bgpio_get_multiple_be(struct gpio_chip *gc, unsigned long *mask,
unsigned long val;
int bit;
+ /* Make sure we first clear any bits that are zero when we read the register */
+ *bits &= ~*mask;
+
/* Create a mirrored mask */
- bit = 0;
- while ((bit = find_next_bit(mask, gc->ngpio, bit)) != gc->ngpio)
+ bit = -1;
+ while ((bit = find_next_bit(mask, gc->ngpio, bit + 1)) < gc->ngpio)
readmask |= bgpio_line2mask(gc, bit);
/* Read the register */
@@ -208,8 +210,8 @@ static int bgpio_get_multiple_be(struct gpio_chip *gc, unsigned long *mask,
* Mirror the result into the "bits" result, this will give line 0
* in bit 0 ... line 31 in bit 31 for a 32bit register.
*/
- bit = 0;
- while ((bit = find_next_bit(&val, gc->ngpio, bit)) != gc->ngpio)
+ bit = -1;
+ while ((bit = find_next_bit(&val, gc->ngpio, bit + 1)) < gc->ngpio)
*bits |= bgpio_line2mask(gc, bit);
return 0;