linux-kernel - Re: [PATCH] CHROMIUM: drm: bridge/dw_hdmi: Eliminate unused cable

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Date:	Mon, 21 Sep 2015 11:51:06 +0200
From:	Thierry Reding <treding@...dia.com>
To:	Douglas Anderson <dianders@...omium.org>,
	Russell King <rmk+kernel@....linux.org.uk>
CC:	<airlied@...ux.ie>, <fabio.estevam@...escale.com>,
	<ykk@...k-chips.com>, <rmk+kernel@....linux.org.uk>,
	<p.zabel@...gutronix.de>, <andy.yan@...k-chips.com>,
	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] CHROMIUM: drm: bridge/dw_hdmi: Eliminate unused
 cable_plugin

On Wed, Sep 16, 2015 at 01:41:38PM -0700, Douglas Anderson wrote:
> There's a member in 'struct dw_hdmi' called cable_plugin.  It's never
> set to anything anywhere so thus is always false.  There's a bit of code
> checking it, but since it's always false this must be dead code.
> Eliminate it.
> 
> Note: if someone wants to figure out the intention of the original code
> and implement whatever feature / fix was needed then we can drop this
> patch.  The 'cable_plugin' member has been unused since the code was
> first added in (9aaf880 imx-drm: Add mx6 hdmi transmitter support).
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
>  drivers/gpu/drm/bridge/dw_hdmi.c | 9 ---------
>  1 file changed, 9 deletions(-)

Except for the CHROMIUM: prefix this looks good to me:

Reviewed-by: Thierry Reding <treding@...dia.com>

Russell, do you have patches to this driver queued for v4.4 and plan to
pick this up into your tree or should I take it?

Thierry

> 
> diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c
> index 0083d4e..ba90885 100644
> --- a/drivers/gpu/drm/bridge/dw_hdmi.c
> +++ b/drivers/gpu/drm/bridge/dw_hdmi.c
> @@ -115,7 +115,6 @@ struct dw_hdmi {
>  	int vic;
>  
>  	u8 edid[HDMI_EDID_LEN];
> -	bool cable_plugin;
>  
>  	bool phy_enabled;
>  	struct drm_display_mode previous_mode;
> @@ -1203,12 +1202,6 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
>  		hdmi_writeb(hdmi, val, HDMI_FC_INVIDCONF);
>  }
>  
> -static void hdmi_enable_overflow_interrupts(struct dw_hdmi *hdmi)
> -{
> -	hdmi_writeb(hdmi, 0, HDMI_FC_MASK2);
> -	hdmi_writeb(hdmi, 0, HDMI_IH_MUTE_FC_STAT2);
> -}
> -
>  static void hdmi_disable_overflow_interrupts(struct dw_hdmi *hdmi)
>  {
>  	hdmi_writeb(hdmi, HDMI_IH_MUTE_FC_STAT2_OVERFLOW_MASK,
> @@ -1285,8 +1278,6 @@ static int dw_hdmi_setup(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
>  	hdmi_tx_hdcp_config(hdmi);
>  
>  	dw_hdmi_clear_overflow(hdmi);
> -	if (hdmi->cable_plugin && hdmi->sink_is_hdmi)
> -		hdmi_enable_overflow_interrupts(hdmi);
>  
>  	return 0;
>  }
> -- 
> 2.6.0.rc0.131.gf624c3d
> 

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