Patch "pwm: sti: Fix capture for st,pwm-num-chan < st,capture-num-chan" has been added to the 6.6-stable tree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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 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:
     pwm-sti-fix-capture-for-st-pwm-num-chan-st-capture-n.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 77961f580b47dad6846a31cc5a54001b33e0fbba
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 c8800f84b917f..c782378dff5e5 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];




[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux