linux-kernel - Re: [PATCH v6 2/5] pwm: mtk_disp: fix force reg to working reg.

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Date:   Wed, 4 Aug 2021 19:12:42 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Jitao Shi <jitao.shi@...iatek.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     linux-pwm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        srv_heupstream@...iatek.com, yingjoe.chen@...iatek.com,
        eddie.huang@...iatek.com, ck.hu@...iatek.com, stonea168@....com,
        huijuan.xie@...iatek.com, shuijing.li@...iatek.com
Subject: Re: [PATCH v6 2/5] pwm: mtk_disp: fix force reg to working reg.



On 24/07/2021 10:18, Jitao Shi wrote:
> Disable reg double buffer before writing register.

The commit message does not explain why you move this from probe to pwm_config.
Can you please explain exactly why you need to do that.

Regards,
Matthias

> 
> Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
> ---
>  drivers/pwm/pwm-mtk-disp.c | 24 +++++++++++-------------
>  1 file changed, 11 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c
> index 3ade525adcc3..1070d78d4940 100644
> --- a/drivers/pwm/pwm-mtk-disp.c
> +++ b/drivers/pwm/pwm-mtk-disp.c
> @@ -128,6 +128,17 @@ static int mtk_disp_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
>  		mtk_disp_pwm_update_bits(mdp, mdp->data->commit,
>  					 mdp->data->commit_mask,
>  					 0x0);
> +	} else {
> +	/*
> +	 * For MT2701, disable double buffer before writing register
> +	 * and select manual mode and use PWM_PERIOD/PWM_HIGH_WIDTH.
> +	 */
> +		mtk_disp_pwm_update_bits(mdp, mdp->data->bls_debug,
> +					 mdp->data->bls_debug_mask,
> +					 mdp->data->bls_debug_mask);
> +		mtk_disp_pwm_update_bits(mdp, mdp->data->con0,
> +					 mdp->data->con0_sel,
> +					 mdp->data->con0_sel);
>  	}
>  
>  	clk_disable_unprepare(mdp->clk_mm);
> @@ -213,19 +224,6 @@ static int mtk_disp_pwm_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, mdp);
>  
> -	/*
> -	 * For MT2701, disable double buffer before writing register
> -	 * and select manual mode and use PWM_PERIOD/PWM_HIGH_WIDTH.
> -	 */
> -	if (!mdp->data->has_commit) {
> -		mtk_disp_pwm_update_bits(mdp, mdp->data->bls_debug,
> -					 mdp->data->bls_debug_mask,
> -					 mdp->data->bls_debug_mask);
> -		mtk_disp_pwm_update_bits(mdp, mdp->data->con0,
> -					 mdp->data->con0_sel,
> -					 mdp->data->con0_sel);
> -	}
> -
>  	return 0;
>  }
>  
>