Patch "gpio: nomadik: fix offset bug in nmk_pmx_set()" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    gpio: nomadik: fix offset bug in nmk_pmx_set()

to the 6.6-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:
     gpio-nomadik-fix-offset-bug-in-nmk_pmx_set.patch
and it can be found in the queue-6.6 subdirectory.

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



commit c1b8076fff197650ea448c6e9e128ed940453c37
Author: Théo Lebrun <theo.lebrun@xxxxxxxxxxx>
Date:   Wed Feb 28 12:28:03 2024 +0100

    gpio: nomadik: fix offset bug in nmk_pmx_set()
    
    [ Upstream commit 53cf6b72e074864b94ade97dcb6f30b5ac1a82dc ]
    
    Previously, the statement looked like:
    
        slpm[x] &= ~BIT(g->grp.pins[i]);
    
    Where:
     - slpm is a unsigned int pointer;
     - g->grp.pins[i] is a pin number. It can grow to more than 32.
    
    The expected shift amount is a pin bank offset.
    
    This bug does not occur on every group or pin: the altsetting must be
    NMK_GPIO_ALT_C and the pin must be 32 or above. It might have occured.
    For example, in pinctrl-nomadik-db8500.c, pin group i2c3_c_2 has the
    right altsetting and pins 229 and 230.
    
    Fixes: dbfe8ca259e1 ("pinctrl/nomadik: implement pin multiplexing")
    Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
    Signed-off-by: Théo Lebrun <theo.lebrun@xxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20240228-mbly-gpio-v2-5-3ba757474006@xxxxxxxxxxx
    Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/pinctrl/nomadik/pinctrl-nomadik.c b/drivers/pinctrl/nomadik/pinctrl-nomadik.c
index 86a638077a697..e7d33093994b2 100644
--- a/drivers/pinctrl/nomadik/pinctrl-nomadik.c
+++ b/drivers/pinctrl/nomadik/pinctrl-nomadik.c
@@ -1573,8 +1573,10 @@ static int nmk_pmx_set(struct pinctrl_dev *pctldev, unsigned function,
 		 * Then mask the pins that need to be sleeping now when we're
 		 * switching to the ALT C function.
 		 */
-		for (i = 0; i < g->grp.npins; i++)
-			slpm[g->grp.pins[i] / NMK_GPIO_PER_CHIP] &= ~BIT(g->grp.pins[i]);
+		for (i = 0; i < g->grp.npins; i++) {
+			unsigned int bit = g->grp.pins[i] % NMK_GPIO_PER_CHIP;
+			slpm[g->grp.pins[i] / NMK_GPIO_PER_CHIP] &= ~BIT(bit);
+		}
 		nmk_gpio_glitch_slpm_init(slpm);
 	}