This is a note to let you know that I've just added the patch titled
pwm: atmel-tcb: Put per-channel data into driver data
to the 6.1-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-atmel-tcb-put-per-channel-data-into-driver-data.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f279e5c85301bf665818507944e93ff728321bd5
Author: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Date: Wed Jul 19 21:20:11 2023 +0200
pwm: atmel-tcb: Put per-channel data into driver data
[ Upstream commit 78dca23bd6706dd6a3cdb5c0052f48794b4d2bed ]
This simplifies the code, reduces the number of memory allocations and
pointer dereferences.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Reviewed-by: Claudiu Beznea <claudiu.beznea@xxxxxxxxx>
Signed-off-by: Thierry Reding <thierry.reding@xxxxxxxxx>
Stable-dep-of: 37f7707077f5 ("pwm: atmel-tcb: Fix race condition and convert to guards")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c
index 2826fc216d291..ae274bd7907dd 100644
--- a/drivers/pwm/pwm-atmel-tcb.c
+++ b/drivers/pwm/pwm-atmel-tcb.c
@@ -57,7 +57,7 @@ struct atmel_tcb_pwm_chip {
struct clk *clk;
struct clk *gclk;
struct clk *slow_clk;
- struct atmel_tcb_pwm_device *pwms[NPWM];
+ struct atmel_tcb_pwm_device pwms[NPWM];
struct atmel_tcb_channel bkup;
};
@@ -73,7 +73,7 @@ static int atmel_tcb_pwm_set_polarity(struct pwm_chip *chip,
enum pwm_polarity polarity)
{
struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
- struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
+ struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
tcbpwm->polarity = polarity;
@@ -84,19 +84,13 @@ static int atmel_tcb_pwm_request(struct pwm_chip *chip,
struct pwm_device *pwm)
{
struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
- struct atmel_tcb_pwm_device *tcbpwm;
+ struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
unsigned cmr;
int ret;
- tcbpwm = devm_kzalloc(chip->dev, sizeof(*tcbpwm), GFP_KERNEL);
- if (!tcbpwm)
- return -ENOMEM;
-
ret = clk_prepare_enable(tcbpwmc->clk);
- if (ret) {
- devm_kfree(chip->dev, tcbpwm);
+ if (ret)
return ret;
- }
tcbpwm->polarity = PWM_POLARITY_NORMAL;
tcbpwm->duty = 0;
@@ -131,25 +125,20 @@ static int atmel_tcb_pwm_request(struct pwm_chip *chip,
regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), cmr);
spin_unlock(&tcbpwmc->lock);
- tcbpwmc->pwms[pwm->hwpwm] = tcbpwm;
-
return 0;
}
static void atmel_tcb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
- struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
clk_disable_unprepare(tcbpwmc->clk);
- tcbpwmc->pwms[pwm->hwpwm] = NULL;
- devm_kfree(chip->dev, tcbpwm);
}
static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
- struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
+ struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
unsigned cmr;
enum pwm_polarity polarity = tcbpwm->polarity;
@@ -206,7 +195,7 @@ static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
static int atmel_tcb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
- struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
+ struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
u32 cmr;
enum pwm_polarity polarity = tcbpwm->polarity;
@@ -291,7 +280,7 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
- struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
+ struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
struct atmel_tcb_pwm_device *atcbpwm = NULL;
int i = 0;
int slowclk = 0;
@@ -338,9 +327,9 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
period = div_u64(period_ns, min);
if (pwm->hwpwm == 0)
- atcbpwm = tcbpwmc->pwms[1];
+ atcbpwm = &tcbpwmc->pwms[1];
else
- atcbpwm = tcbpwmc->pwms[0];
+ atcbpwm = &tcbpwmc->pwms[0];
/*
* PWM devices provided by the TCB driver are grouped by 2.
