Patch "pinctrl: sh-pfc: Do not unconditionally support PIN_CONFIG_BIAS_DISABLE" has been added to the 4.9-stable tree

Patch "pinctrl: sh-pfc: Do not unconditionally support PIN_CONFIG_BIAS_DISABLE" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    pinctrl: sh-pfc: Do not unconditionally support PIN_CONFIG_BIAS_DISABLE

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pinctrl-sh-pfc-do-not-unconditionally-support-pin_config_bias_disable.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 5d7400c4acbf7fe633a976a89ee845f7333de3e4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niklas=20S=C3=B6derlund?=
 <niklas.soderlund+renesas@ragnatech.se>
Date: Sat, 12 Nov 2016 17:04:24 +0100
Subject: pinctrl: sh-pfc: Do not unconditionally support PIN_CONFIG_BIAS_DISABLE
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

commit 5d7400c4acbf7fe633a976a89ee845f7333de3e4 upstream.

Always stating PIN_CONFIG_BIAS_DISABLE is supported gives untrue output
when examining /sys/kernel/debug/pinctrl/e6060000.pfc/pinconf-pins if
the operation get_bias() is implemented but the pin is not handled by
the get_bias() implementation. In that case the output will state that
"input bias disabled" indicating that this pin has bias control
support.

Make support for PIN_CONFIG_BIAS_DISABLE depend on that the pin either
supports SH_PFC_PIN_CFG_PULL_UP or SH_PFC_PIN_CFG_PULL_DOWN. This also
solves the issue where SoC specific implementations print error messages
if their particular implementation of {set,get}_bias() is called with a
pin it does not know about.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pinctrl/sh-pfc/pinctrl.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/pinctrl/sh-pfc/pinctrl.c
+++ b/drivers/pinctrl/sh-pfc/pinctrl.c
@@ -570,7 +570,8 @@ static bool sh_pfc_pinconf_validate(stru
 
 	switch (param) {
 	case PIN_CONFIG_BIAS_DISABLE:
-		return true;
+		return pin->configs &
+			(SH_PFC_PIN_CFG_PULL_UP | SH_PFC_PIN_CFG_PULL_DOWN);
 
 	case PIN_CONFIG_BIAS_PULL_UP:
 		return pin->configs & SH_PFC_PIN_CFG_PULL_UP;


Patches currently in stable-queue which might be from niklas.soderlund+renesas@ragnatech.se are

queue-4.9/pinctrl-sh-pfc-do-not-unconditionally-support-pin_config_bias_disable.patch
queue-4.9/pinctrl-sh-pfc-add-helper-to-handle-bias-lookup-table.patch
queue-4.9/pinctrl-sh-pfc-r8a7795-use-lookup-function-for-bias-data.patch