linux-kernel - Re: [PATCH v4 11/15] drm/bridge: tc358767: Introduce tc_set

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Date:   Fri, 7 Jun 2019 08:15:25 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>,
        dri-devel@...ts.freedesktop.org
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Archit Taneja <architt@...eaurora.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Andrey Gusakov <andrey.gusakov@...entembedded.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Chris Healy <cphealy@...il.com>,
        Cory Tusar <cory.tusar@....aero>,
        Lucas Stach <l.stach@...gutronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 11/15] drm/bridge: tc358767: Introduce
 tc_set_syspllparam()

On 07.06.2019 06:45, Andrey Smirnov wrote:
> Move common code converting clock rate to an appropriate constant and
> configuring SYS_PLLPARAM register into a separate routine and convert
> the rest of the code to use it. No functional change intended.
>
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>

 --
Regards
Andrzej
> Cc: Archit Taneja <architt@...eaurora.org>
> Cc: Andrzej Hajda <a.hajda@...sung.com>
> Cc: Laurent Pinchart <Laurent.pinchart@...asonboard.com>
> Cc: Tomi Valkeinen <tomi.valkeinen@...com>
> Cc: Andrey Gusakov <andrey.gusakov@...entembedded.com>
> Cc: Philipp Zabel <p.zabel@...gutronix.de>
> Cc: Chris Healy <cphealy@...il.com>
> Cc: Cory Tusar <cory.tusar@....aero>
> Cc: Lucas Stach <l.stach@...gutronix.de>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  drivers/gpu/drm/bridge/tc358767.c | 46 +++++++++++--------------------
>  1 file changed, 16 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
> index 4bb9b15e1324..ac55b59249e3 100644
> --- a/drivers/gpu/drm/bridge/tc358767.c
> +++ b/drivers/gpu/drm/bridge/tc358767.c
> @@ -581,35 +581,40 @@ static int tc_stream_clock_calc(struct tc_data *tc)
>  	return regmap_write(tc->regmap, DP0_VIDMNGEN1, 32768);
>  }
>  
> -static int tc_aux_link_setup(struct tc_data *tc)
> +static int tc_set_syspllparam(struct tc_data *tc)
>  {
>  	unsigned long rate;
> -	u32 dp0_auxcfg1;
> -	u32 value;
> -	int ret;
> +	u32 pllparam = SYSCLK_SEL_LSCLK | LSCLK_DIV_2;
>  
>  	rate = clk_get_rate(tc->refclk);
>  	switch (rate) {
>  	case 38400000:
> -		value = REF_FREQ_38M4;
> +		pllparam |= REF_FREQ_38M4;
>  		break;
>  	case 26000000:
> -		value = REF_FREQ_26M;
> +		pllparam |= REF_FREQ_26M;
>  		break;
>  	case 19200000:
> -		value = REF_FREQ_19M2;
> +		pllparam |= REF_FREQ_19M2;
>  		break;
>  	case 13000000:
> -		value = REF_FREQ_13M;
> +		pllparam |= REF_FREQ_13M;
>  		break;
>  	default:
>  		dev_err(tc->dev, "Invalid refclk rate: %lu Hz\n", rate);
>  		return -EINVAL;
>  	}
>  
> +	return regmap_write(tc->regmap, SYS_PLLPARAM, pllparam);
> +}
> +
> +static int tc_aux_link_setup(struct tc_data *tc)
> +{
> +	int ret;
> +	u32 dp0_auxcfg1;
> +
>  	/* Setup DP-PHY / PLL */
> -	value |= SYSCLK_SEL_LSCLK | LSCLK_DIV_2;
> -	ret = regmap_write(tc->regmap, SYS_PLLPARAM, value);
> +	ret = tc_set_syspllparam(tc);
>  	if (ret)
>  		goto err;
>  
> @@ -868,7 +873,6 @@ static int tc_main_link_enable(struct tc_data *tc)
>  {
>  	struct drm_dp_aux *aux = &tc->aux;
>  	struct device *dev = tc->dev;
> -	unsigned int rate;
>  	u32 dp_phy_ctrl;
>  	u32 value;
>  	int ret;
> @@ -896,25 +900,7 @@ static int tc_main_link_enable(struct tc_data *tc)
>  	if (ret)
>  		return ret;
>  
> -	rate = clk_get_rate(tc->refclk);
> -	switch (rate) {
> -	case 38400000:
> -		value = REF_FREQ_38M4;
> -		break;
> -	case 26000000:
> -		value = REF_FREQ_26M;
> -		break;
> -	case 19200000:
> -		value = REF_FREQ_19M2;
> -		break;
> -	case 13000000:
> -		value = REF_FREQ_13M;
> -		break;
> -	default:
> -		return -EINVAL;
> -	}
> -	value |= SYSCLK_SEL_LSCLK | LSCLK_DIV_2;
> -	ret = regmap_write(tc->regmap, SYS_PLLPARAM, value);
> +	ret = tc_set_syspllparam(tc);
>  	if (ret)
>  		return ret;
>