Messages in this thread | | | Date | Tue, 13 Sep 2022 11:05:21 +0200 | From | Uwe Kleine-König <> | Subject | Re: [PATCH] pwm: mtk-disp: Fix the parameters calculated by the enabled flag of disp_pwm. |
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Hello,
On Mon, Aug 29, 2022 at 12:04:12PM +0800, xinlei.lee@mediatek.com wrote: > From: xinlei lee <xinlei.lee@mediatek.com> > > In the original mtk_disp_pwm_get_state() function, the result of reading > con0 & BIT(0) is enabled as disp_pwm. > In order to conform to the register table, we should use the disp_pwm > base address as the enabled judgment.
Do you want to say:
The enable bit of the hardware is bit 0 of the DISP_PWM_EN register at offset 0 for all supported hardwares. Up to now the bit was wrongly assumed to be in the CON0 register.
?
> Fixes: 3f2b16734914 ("pwm: mtk-disp: Implement atomic API .get_state()") >
This newline is unusal.
> Signed-off-by: xinlei lee <xinlei.lee@mediatek.com> > Reviewed-by: Miles Chen <miles.chen@mediatek.com> > --- > Base on the branch of Linux-next/master. > Split from series [1]. > [1] https://patchwork.kernel.org/project/linux-mediatek/cover/1661239875-19841-1-git-send-email-xinlei.lee@mediatek.com/ > --- > --- > drivers/pwm/pwm-mtk-disp.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c > index c605013..50425cd 100644 > --- a/drivers/pwm/pwm-mtk-disp.c > +++ b/drivers/pwm/pwm-mtk-disp.c > @@ -197,7 +197,7 @@ static void mtk_disp_pwm_get_state(struct pwm_chip *chip, > rate = clk_get_rate(mdp->clk_main); > con0 = readl(mdp->base + mdp->data->con0); > con1 = readl(mdp->base + mdp->data->con1); > - state->enabled = !!(con0 & BIT(0)); > + state->enabled = !!(readl(mdp->base) & BIT(0));
I would expect this to better be:
state->enabled = !!(readl(mdp->base + DISP_PWM_EN) & BIT(0));
which is the same for the compiler but a bit more descriptive for the human reader.
> clk_div = FIELD_GET(PWM_CLKDIV_MASK, con0); > period = FIELD_GET(PWM_PERIOD_MASK, con1); > /*
Best regards Uwe
-- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | https://www.pengutronix.de/ | [unhandled content-type:application/pgp-signature] | |