Greetings. I'd like to request a backport/cherry-pick of an existing
patch from the Linus tree onto the linux-4.9.y tree as I'm helping some
folk try to get Debian-stable-vintage Linux running on an instance of the
affected hardware. Without this patch the GPIO pins don't function, but
with the cherry-picked patch they come to life.
The commit is d68b42e30bbacd24354d644f430d088435b15e83 in the mainline
Linux tree and it applied cleanly to the linux-4.9.y tree as of 4.9.115
(dbcdf42bab53d219caa51bcfe54c8b9066010290); I include a copy of it
for reference.
Thanks.
---
>From d68b42e30bbacd24354d644f430d088435b15e83 Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Date: Thu, 24 Aug 2017 11:19:33 +0300
Subject: [PATCH] pinctrl: intel: Read back TX buffer state
In the same way as it's done in pinctrl-cherryview.c we would provide
a readback TX buffer state.
Fixes: 17fab473693 ("pinctrl: intel: Set pin direction properly")
Reported-by: "Bourque, Francis" <francis.bourque@xxxxxxxxx>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Acked-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Tested-by: "Bourque, Francis" <francis.bourque@xxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
drivers/pinctrl/intel/pinctrl-intel.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index ac806891ff81..71df0f70b61f 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -751,12 +751,17 @@ static int intel_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct intel_pinctrl *pctrl = gpiochip_get_data(chip);
void __iomem *reg;
+ u32 padcfg0;
reg = intel_get_padcfg(pctrl, offset, PADCFG0);
if (!reg)
return -EINVAL;
- return !!(readl(reg) & PADCFG0_GPIORXSTATE);
+ padcfg0 = readl(reg);
+ if (!(padcfg0 & PADCFG0_GPIOTXDIS))
+ return !!(padcfg0 & PADCFG0_GPIOTXSTATE);
+
+ return !!(padcfg0 & PADCFG0_GPIORXSTATE);
}
static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
--
2.11.0
--
Anthony de Boer
