[PATCH] gpio: pxa: fix legacy non pinctrl aware builds again

[PATCH] gpio: pxa: fix legacy non pinctrl aware builds again

[Robert Jarzmik]

As pointed out by Gregor, spitz keyboard matrix is broken, with or
without CONFIG_PINCTRL set, quoting :
"The gpio matrix keypard on the Zaurus C3x00 (see spitz.c) does not work
properly. Noticeable are that rshift+c does nothing where as lshift+c
creates C.  Opposite it is for rshift+a vs lshift+a, here only rshift
works. This affects a few other combinations using the rshift or lshift
buttons."

As a matter of fact, as for platform_data based builds CONFIG_PINCTRL=n
is required for now (as opposed for devicetree builds where it should be
set), this means gpio driver should change the direction, which is what
was attempted by commit c4e5ffb6f224 ("gpio: pxa: fix legacy non pinctrl
aware builds").

Unfortunately, the input case was inverted, and the direction change was
never done. This wasn't seen up until now because the initial platform
setup (MFP) was setting this direction. Yet in Gregory's case, the
matrix-keypad driver changes back and forth the direction dynamically,
and this is why he's the first to report it.

Fixes: c4e5ffb6f224 ("gpio: pxa: fix legacy non pinctrl aware builds")
Tested-by: Greg <greguu@null.net>
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 drivers/gpio/gpio-pxa.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-pxa.c b/drivers/gpio/gpio-pxa.c
index 63536655f274..501147c5f3ca 100644
--- a/drivers/gpio/gpio-pxa.c
+++ b/drivers/gpio/gpio-pxa.c
@@ -268,8 +268,8 @@ static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 
 	if (pxa_gpio_has_pinctrl()) {
 		ret = pinctrl_gpio_direction_input(chip->base + offset);
-		if (!ret)
-			return 0;
+		if (ret)
+			return ret;
 	}
 
 	spin_lock_irqsave(&gpio_lock, flags);
-- 
2.11.0

Re: [PATCH] gpio: pxa: fix legacy non pinctrl aware builds again

[Linus Walleij]

On Thu, Nov 15, 2018 at 6:16 PM Robert Jarzmik <robert.jarzmik@free.fr> wrote:

> As pointed out by Gregor, spitz keyboard matrix is broken, with or
> without CONFIG_PINCTRL set, quoting :
> "The gpio matrix keypard on the Zaurus C3x00 (see spitz.c) does not work
> properly. Noticeable are that rshift+c does nothing where as lshift+c
> creates C.  Opposite it is for rshift+a vs lshift+a, here only rshift
> works. This affects a few other combinations using the rshift or lshift
> buttons."
>
> As a matter of fact, as for platform_data based builds CONFIG_PINCTRL=n
> is required for now (as opposed for devicetree builds where it should be
> set), this means gpio driver should change the direction, which is what
> was attempted by commit c4e5ffb6f224 ("gpio: pxa: fix legacy non pinctrl
> aware builds").
>
> Unfortunately, the input case was inverted, and the direction change was
> never done. This wasn't seen up until now because the initial platform
> setup (MFP) was setting this direction. Yet in Gregory's case, the
> matrix-keypad driver changes back and forth the direction dynamically,
> and this is why he's the first to report it.
>
> Fixes: c4e5ffb6f224 ("gpio: pxa: fix legacy non pinctrl aware builds")
> Tested-by: Greg <greguu@null.net>
> Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>

Patch applied for fixes.

Yours,
Linus Walleij