linux-kernel - Re: [PATCH 8/9] drm/bridge: tc358767: Introduce tc_pllupdate

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Date:   Mon, 4 Mar 2019 14:37:11 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     dri-devel@...ts.freedesktop.org,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/9] drm/bridge: tc358767: Introduce tc_pllupdate_pllen()

Hi Andrey,

Thank you for the patch.

On Tue, Feb 26, 2019 at 11:36:08AM -0800, Andrey Smirnov wrote:
> Tc_wait_pll_lock() is always called as a follow-up for updating

s/Tc/tc/

> PLLUPDATE and PLLEN bit of a given PLL control register. To simplify
> things, merge the two operation into a single helper function
> tc_pllupdate_pllen() and convert the rest of the code to use it. No
> functional change intended.
> 
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Cc: Archit Taneja <architt@...eaurora.org>
> Cc: Andrzej Hajda <a.hajda@...sung.com>
> Cc: Laurent Pinchart <Laurent.pinchart@...asonboard.com>
> Cc: Chris Healy <cphealy@...il.com>
> Cc: Lucas Stach <l.stach@...gutronix.de>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: linux-kernel@...r.kernel.org

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/gpu/drm/bridge/tc358767.c | 36 +++++++++++++++++++------------
>  1 file changed, 22 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
> index 227f14cd2d3d..239b3aaa255d 100644
> --- a/drivers/gpu/drm/bridge/tc358767.c
> +++ b/drivers/gpu/drm/bridge/tc358767.c
> @@ -390,10 +390,18 @@ static u32 tc_srcctrl(struct tc_data *tc)
>  	return reg;
>  }
>  
> -static void tc_wait_pll_lock(struct tc_data *tc)
> +static int tc_pllupdate_pllen(struct tc_data *tc, unsigned int pllctrl)
>  {
> +	int ret;
> +
> +	ret = regmap_write(tc->regmap, pllctrl, PLLUPDATE | PLLEN);
> +	if (ret)
> +		return ret;
> +
>  	/* Wait for PLL to lock: up to 2.09 ms, depending on refclk */
>  	usleep_range(3000, 6000);
> +
> +	return 0;
>  }
>  
>  static int tc_pxl_pll_en(struct tc_data *tc, u32 refclk, u32 pixelclock)
> @@ -487,11 +495,7 @@ static int tc_pxl_pll_en(struct tc_data *tc, u32 refclk, u32 pixelclock)
>  		 (best_mul << 0));		/* Multiplier for PLL */
>  
>  	/* Force PLL parameter update and disable bypass */
> -	tc_write(PXL_PLLCTRL, PLLUPDATE | PLLEN);
> -
> -	tc_wait_pll_lock(tc);
> -
> -	return 0;
> +	return tc_pllupdate_pllen(tc, PXL_PLLCTRL);
>  err:
>  	return ret;
>  }
> @@ -568,11 +572,13 @@ static int tc_aux_link_setup(struct tc_data *tc)
>  	 * Initially PLLs are in bypass. Force PLL parameter update,
>  	 * disable PLL bypass, enable PLL
>  	 */
> -	tc_write(DP0_PLLCTRL, PLLUPDATE | PLLEN);
> -	tc_wait_pll_lock(tc);
> +	ret = tc_pllupdate_pllen(tc, DP0_PLLCTRL);
> +	if (ret)
> +		return ret;
>  
> -	tc_write(DP1_PLLCTRL, PLLUPDATE | PLLEN);
> -	tc_wait_pll_lock(tc);
> +	ret = tc_pllupdate_pllen(tc, DP1_PLLCTRL);
> +	if (ret)
> +		return ret;
>  
>  	ret = tc_poll_timeout(tc->regmap, DP_PHY_CTRL, PHY_RDY, PHY_RDY, 1,
>  			      1000);
> @@ -846,11 +852,13 @@ static int tc_main_link_setup(struct tc_data *tc)
>  	msleep(100);
>  
>  	/* PLL setup */
> -	tc_write(DP0_PLLCTRL, PLLUPDATE | PLLEN);
> -	tc_wait_pll_lock(tc);
> +	ret = tc_pllupdate_pllen(tc, DP0_PLLCTRL);
> +	if (ret)
> +		return ret;
>  
> -	tc_write(DP1_PLLCTRL, PLLUPDATE | PLLEN);
> -	tc_wait_pll_lock(tc);
> +	ret = tc_pllupdate_pllen(tc, DP1_PLLCTRL);
> +	if (ret)
> +		return ret;
>  
>  	/* PXL PLL setup */
>  	if (tc_test_pattern) {

-- 
Regards,

Laurent Pinchart