pinctrl: single: Fix pcs_parse_bits_in_pinctrl_entry to use __ffs than ffs

pcs_parse_bits_in_pinctrl_entry uses ffs which gives bit indices
ranging from 1 to MAX. This leads to a corner case where we try to request
the pin number = MAX and fails.

bit_pos value is being calculted using ffs. pin_num_from_lsb uses
bit_pos value. pins array is populated with:

pin + pin_num_from_lsb.

The above is 1 more than usual bit indices as bit_pos uses ffs to compute
first set bit. Hence the last of the pins array is populated with the MAX
value and not MAX - 1 which causes error when we call pin_request.

mask_pos is rightly calculated as ((pcs->fmask) << (bit_pos - 1))
Consequently val_pos and submask are correct.

Hence use __ffs which gives (ffs(x) - 1) as the first bit set.

fixes: 4e7e8017a8 ("pinctrl: pinctrl-single: enhance to configure multiple pins of different modules")
Signed-off-by: Keerthy <j-keerthy@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index fb126d56ad40d4c381230978f4da49baca049d40..cf9bafa10acfb51ad42af96cf6580d6de48c1b1d 100644 (file)
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -1280,9 +1280,9 @@ static int pcs_parse_bits_in_pinctrl_entry(struct pcs_device *pcs,
 
                /* Parse pins in each row from LSB */
                while (mask) {
-                       bit_pos = ffs(mask);
+                       bit_pos = __ffs(mask);
                        pin_num_from_lsb = bit_pos / pcs->bits_per_pin;
-                       mask_pos = ((pcs->fmask) << (bit_pos - 1));
+                       mask_pos = ((pcs->fmask) << bit_pos);
                        val_pos = val & mask_pos;
                        submask = mask & mask_pos;
 
@@ -1852,7 +1852,7 @@ static int pcs_probe(struct platform_device *pdev)
        ret = of_property_read_u32(np, "pinctrl-single,function-mask",
                                   &pcs->fmask);
        if (!ret) {
-               pcs->fshift = ffs(pcs->fmask) - 1;
+               pcs->fshift = __ffs(pcs->fmask);
                pcs->fmax = pcs->fmask >> pcs->fshift;
        } else {
                /* If mask property doesn't exist, function mux is invalid. */