diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2023-07-05 11:06:46 +0300 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2023-10-13 11:07:17 +0300 |
| commit | 06cc4767750337ad162a0a7bcfd6f6eff6e0fe92 (patch) | |
| tree | 8c9265ec5aaeeb8c79f68a5a1777b6f2a0fb8a62 /drivers/pwm | |
| parent | 89c8de78cea3119dab28830fb5dcc663ede587c8 (diff) | |
| download | linux-06cc4767750337ad162a0a7bcfd6f6eff6e0fe92.tar.xz | |
pwm: lp3943: Drop usage of pwm_[gs]et_chip_data()
Instead of distributing the driver's bookkeeping over 3 (i.e.
LP3943_NUM_PWMS + 1) separately allocated memory chunks, put all together
in struct lp3943_pwm. This reduces the number of memory allocations and
so fragmentation and maybe even the number of cache misses. Also
&lp3943_pwm->pwm_map[pwm->hwpwm] is cheaper to evaluate than
pwm_get_chip_data(pwm) as the former is just an addition in machine code
while the latter involves a function call.
Link: https://lore.kernel.org/r/20230705080650.2353391-5-u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-lp3943.c | 21 |
1 files changed, 7 insertions, 14 deletions
diff --git a/drivers/pwm/pwm-lp3943.c b/drivers/pwm/pwm-lp3943.c index a1a106747372..32350a357278 100644 --- a/drivers/pwm/pwm-lp3943.c +++ b/drivers/pwm/pwm-lp3943.c @@ -23,6 +23,7 @@ struct lp3943_pwm { struct pwm_chip chip; struct lp3943 *lp3943; struct lp3943_platform_data *pdata; + struct lp3943_pwm_map pwm_map[LP3943_NUM_PWMS]; }; static inline struct lp3943_pwm *to_lp3943_pwm(struct pwm_chip *chip) @@ -35,13 +36,9 @@ lp3943_pwm_request_map(struct lp3943_pwm *lp3943_pwm, int hwpwm) { struct lp3943_platform_data *pdata = lp3943_pwm->pdata; struct lp3943 *lp3943 = lp3943_pwm->lp3943; - struct lp3943_pwm_map *pwm_map; + struct lp3943_pwm_map *pwm_map = &lp3943_pwm->pwm_map[hwpwm]; int i, offset; - pwm_map = kzalloc(sizeof(*pwm_map), GFP_KERNEL); - if (!pwm_map) - return ERR_PTR(-ENOMEM); - pwm_map->output = pdata->pwms[hwpwm]->output; pwm_map->num_outputs = pdata->pwms[hwpwm]->num_outputs; @@ -49,10 +46,8 @@ lp3943_pwm_request_map(struct lp3943_pwm *lp3943_pwm, int hwpwm) offset = pwm_map->output[i]; /* Return an error if the pin is already assigned */ - if (test_and_set_bit(offset, &lp3943->pin_used)) { - kfree(pwm_map); + if (test_and_set_bit(offset, &lp3943->pin_used)) return ERR_PTR(-EBUSY); - } } return pwm_map; @@ -67,7 +62,7 @@ static int lp3943_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) if (IS_ERR(pwm_map)) return PTR_ERR(pwm_map); - return pwm_set_chip_data(pwm, pwm_map); + return 0; } static void lp3943_pwm_free_map(struct lp3943_pwm *lp3943_pwm, @@ -80,14 +75,12 @@ static void lp3943_pwm_free_map(struct lp3943_pwm *lp3943_pwm, offset = pwm_map->output[i]; clear_bit(offset, &lp3943->pin_used); } - - kfree(pwm_map); } static void lp3943_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) { struct lp3943_pwm *lp3943_pwm = to_lp3943_pwm(chip); - struct lp3943_pwm_map *pwm_map = pwm_get_chip_data(pwm); + struct lp3943_pwm_map *pwm_map = &lp3943_pwm->pwm_map[pwm->hwpwm]; lp3943_pwm_free_map(lp3943_pwm, pwm_map); } @@ -159,7 +152,7 @@ static int lp3943_pwm_set_mode(struct lp3943_pwm *lp3943_pwm, static int lp3943_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) { struct lp3943_pwm *lp3943_pwm = to_lp3943_pwm(chip); - struct lp3943_pwm_map *pwm_map = pwm_get_chip_data(pwm); + struct lp3943_pwm_map *pwm_map = &lp3943_pwm->pwm_map[pwm->hwpwm]; u8 val; if (pwm->hwpwm == 0) @@ -178,7 +171,7 @@ static int lp3943_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) static void lp3943_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) { struct lp3943_pwm *lp3943_pwm = to_lp3943_pwm(chip); - struct lp3943_pwm_map *pwm_map = pwm_get_chip_data(pwm); + struct lp3943_pwm_map *pwm_map = &lp3943_pwm->pwm_map[pwm->hwpwm]; /* * LP3943 outputs are open-drain, so the pin should be configured |