On Thu, Mar 01, 2018 at 04:19:12PM +0800, sean.wang@xxxxxxxxxxxx wrote:
> From: Sean Wang <sean.wang@xxxxxxxxxxxx>
>
> Since the offset for both registers, PWMDWIDTH and PWMTHRES, used to
> control PWM4 or PWM5 are distinct from the other PWMs, whose wrong
> programming on PWM hardware causes waveform cannot be output as expected.
> Thus, the patch adds the extra condition for fixing up the weird case to
> let PWM4 or PWM5 able to work on MT7623.
>
> v1 -> v2: use pwm45_fixup naming instead of pwm45_quirk
> v2 -> v3: add more tags for Reviewed-by, Fixes, and Cc stable
>
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: caf065f8fd58 ("pwm: Add MediaTek PWM support")
> Signed-off-by: Sean Wang <sean.wang@xxxxxxxxxxxx>
> Reviewed-by: Matthias Brugger <matthias.bgg@xxxxxxxxx>
> Cc: Zhi Mao <zhi.mao@xxxxxxxxxxxx>
> Cc: John Crispin <john@xxxxxxxxxxx>
> Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
> ---
> drivers/pwm/pwm-mediatek.c | 24 +++++++++++++++++++++---
> 1 file changed, 21 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
[...]
> @@ -151,9 +156,18 @@ static int mtk_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
> return -EINVAL;
> }
>
> + if (pc->soc->pwm45_fixup && pwm->hwpwm > 2) {
> + /*
> + * PWM[4,5] has distinct offset for PWMDWIDTH and PWMTHRES
> + * from the other PWMs on MT7623.
> + */
> + reg_width = PWM45DWIDTH_FIXUP;
> + reg_thres = PWM45THRES_FIXUP;
> + }
I don't understand this. According to the condition above the above
would also use the PWM[4,5] "fixup" register offsets with PWM[3]. Should
the condition be pwm->hwpwm > 3?
Thierry
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