This is a note to let you know that I've just added the patch titled
pwm: sti: Fix capture for st,pwm-num-chan < st,capture-num-chan
to the 5.15-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:
pwm-sti-fix-capture-for-st-pwm-num-chan-st-capture-n.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 956fb499a3c10cbc55fda9150f2e37228ad4c90c
Author: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Date: Sun Feb 4 22:20:43 2024 +0100
pwm: sti: Fix capture for st,pwm-num-chan < st,capture-num-chan
[ Upstream commit 5f623835584f1c8d1030666796f40c47a448ce0b ]
The driver only used the number of pwm channels to set the pwm_chip's
npwm member. The result is that if there are more capture channels than
PWM channels specified in the device tree, only a part of the capture
channel is usable. Fix that by passing the bigger channel count to the
pwm framework. This makes it possible that the .apply() callback is
called with .hwpwm >= pwm_num_devs, catch that case and return an error
code.
Fixes: c97267ae831d ("pwm: sti: Add PWM capture callback")
Link: https://lore.kernel.org/r/20240204212043.2951852-2-u.kleine-koenig@xxxxxxxxxxxxxx
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/pwm/pwm-sti.c b/drivers/pwm/pwm-sti.c
index 652fdb8dc7bfa..0a7920cbd4949 100644
--- a/drivers/pwm/pwm-sti.c
+++ b/drivers/pwm/pwm-sti.c
@@ -395,8 +395,17 @@ static int sti_pwm_capture(struct pwm_chip *chip, struct pwm_device *pwm,
static int sti_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
const struct pwm_state *state)
{
+ struct sti_pwm_chip *pc = to_sti_pwmchip(chip);
+ struct sti_pwm_compat_data *cdata = pc->cdata;
+ struct device *dev = pc->dev;
int err;
+ if (pwm->hwpwm >= cdata->pwm_num_devs) {
+ dev_err(dev, "device %u is not valid for pwm mode\n",
+ pwm->hwpwm);
+ return -EINVAL;
+ }
+
if (state->polarity != PWM_POLARITY_NORMAL)
return -EINVAL;
@@ -647,7 +656,7 @@ static int sti_pwm_probe(struct platform_device *pdev)
pc->chip.dev = dev;
pc->chip.ops = &sti_pwm_ops;
- pc->chip.npwm = pc->cdata->pwm_num_devs;
+ pc->chip.npwm = max(cdata->pwm_num_devs, cdata->cpt_num_devs);
for (i = 0; i < cdata->cpt_num_devs; i++) {
struct sti_cpt_ddata *ddata = &cdata->ddata[i];
