linux-kernel - Re: [PATCH v3 1/9] drm/bridge: ti-sn65dsi86: Split the setting of the dp and dsi rates

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Message-ID: <20200203233140.GA311651@builder>
Date:   Mon, 3 Feb 2020 15:31:40 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        robdclark@...omium.org, linux-arm-msm@...r.kernel.org,
        seanpaul@...omium.org, Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Clark <robdclark@...il.com>,
        Jonas Karlman <jonas@...boo.se>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v3 1/9] drm/bridge: ti-sn65dsi86: Split the setting of
 the dp and dsi rates

On Wed 18 Dec 14:35 PST 2019, Douglas Anderson wrote:

> These two things were in one function.  Split into two.  This looks
> like it's duplicating some code, but don't worry.  This is is just in
> preparation for future changes.
> 
> This is intended to have zero functional change and will just make
> future patches easier to understand.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> Tested-by: Rob Clark <robdclark@...il.com>
> Reviewed-by: Rob Clark <robdclark@...il.com>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
> 
> Changes in v3: None
> Changes in v2: None
> 
>  drivers/gpu/drm/bridge/ti-sn65dsi86.c | 33 +++++++++++++++++++--------
>  1 file changed, 23 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> index 43abf01ebd4c..2fb9370a76e6 100644
> --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> @@ -417,6 +417,24 @@ static void ti_sn_bridge_set_refclk_freq(struct ti_sn_bridge *pdata)
>  			   REFCLK_FREQ(i));
>  }
>  
> +static void ti_sn_bridge_set_dsi_rate(struct ti_sn_bridge *pdata)
> +{
> +	unsigned int bit_rate_mhz, clk_freq_mhz;
> +	unsigned int val;
> +	struct drm_display_mode *mode =
> +		&pdata->bridge.encoder->crtc->state->adjusted_mode;
> +
> +	/* set DSIA clk frequency */
> +	bit_rate_mhz = (mode->clock / 1000) *
> +			mipi_dsi_pixel_format_to_bpp(pdata->dsi->format);
> +	clk_freq_mhz = bit_rate_mhz / (pdata->dsi->lanes * 2);
> +
> +	/* for each increment in val, frequency increases by 5MHz */
> +	val = (MIN_DSI_CLK_FREQ_MHZ / 5) +
> +		(((clk_freq_mhz - MIN_DSI_CLK_FREQ_MHZ) / 5) & 0xFF);
> +	regmap_write(pdata->regmap, SN_DSIA_CLK_FREQ_REG, val);
> +}
> +
>  /**
>   * LUT index corresponds to register value and
>   * LUT values corresponds to dp data rate supported
> @@ -426,22 +444,16 @@ static const unsigned int ti_sn_bridge_dp_rate_lut[] = {
>  	0, 1620, 2160, 2430, 2700, 3240, 4320, 5400
>  };
>  
> -static void ti_sn_bridge_set_dsi_dp_rate(struct ti_sn_bridge *pdata)
> +static void ti_sn_bridge_set_dp_rate(struct ti_sn_bridge *pdata)
>  {
> -	unsigned int bit_rate_mhz, clk_freq_mhz, dp_rate_mhz;
> -	unsigned int val, i;
> +	unsigned int bit_rate_mhz, dp_rate_mhz;
> +	unsigned int i;
>  	struct drm_display_mode *mode =
>  		&pdata->bridge.encoder->crtc->state->adjusted_mode;
>  
>  	/* set DSIA clk frequency */
>  	bit_rate_mhz = (mode->clock / 1000) *
>  			mipi_dsi_pixel_format_to_bpp(pdata->dsi->format);
> -	clk_freq_mhz = bit_rate_mhz / (pdata->dsi->lanes * 2);
> -
> -	/* for each increment in val, frequency increases by 5MHz */
> -	val = (MIN_DSI_CLK_FREQ_MHZ / 5) +
> -		(((clk_freq_mhz - MIN_DSI_CLK_FREQ_MHZ) / 5) & 0xFF);
> -	regmap_write(pdata->regmap, SN_DSIA_CLK_FREQ_REG, val);
>  
>  	/* set DP data rate */
>  	dp_rate_mhz = ((bit_rate_mhz / pdata->dsi->lanes) * DP_CLK_FUDGE_NUM) /
> @@ -510,7 +522,8 @@ static void ti_sn_bridge_enable(struct drm_bridge *bridge)
>  			   val);
>  
>  	/* set dsi/dp clk frequency value */
> -	ti_sn_bridge_set_dsi_dp_rate(pdata);
> +	ti_sn_bridge_set_dsi_rate(pdata);
> +	ti_sn_bridge_set_dp_rate(pdata);
>  
>  	/* enable DP PLL */
>  	regmap_write(pdata->regmap, SN_PLL_ENABLE_REG, 1);
> -- 
> 2.24.1.735.g03f4e72817-goog
>