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

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Message-ID: <1443169791.4397.38.camel@pengutronix.de>
Date:	Fri, 25 Sep 2015 10:29:51 +0200
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Thierry Reding <treding@...dia.com>
Cc:	Douglas Anderson <dianders@...omium.org>, airlied@...ux.ie,
	fabio.estevam@...escale.com, ykk@...k-chips.com,
	andy.yan@...k-chips.com, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH] CHROMIUM: drm: bridge/dw_hdmi: Eliminate unused
 cable_plugin

Am Montag, den 21.09.2015, 15:15 +0100 schrieb Russell King - ARM Linux:
> On Mon, Sep 21, 2015 at 11:51:06AM +0200, Thierry Reding wrote:
> > 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>

This seems to be similar to Sascha's "drm: bridge/dw_hdmi: remove unused
code" patch, except that the hdmi_disable_overflow_interrupts function
could be removed too.

> > 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?
> 
> My current patch stack for imx-drm related stuff looks like this at
> present:
>
> drm: bridge/dw_hdmi: place PHY into low power mode when disabled
> drm: bridge/dw_hdmi: start of support for pixel doubled modes
> drm: bridge/dw_hdmi: remove CEC engine register definitions
> drm: bridge/dw_hdmi-cec: add Designware HDMI CEC driver
> cec: add HDMI CEC input driver
> cec: add HDMI CEC core driver
> drm: bridge/dw_hdmi: replace CTS calculation for the ACR
> drm: bridge/dw_hdmi: remove ratio support from ACR code
> drm: bridge/dw_hdmi: adjust pixel clock values in N calculation
> drm: bridge/dw_hdmi: avoid being recursive in N calculation
> drm: bridge/dw_hdmi-ahb-audio: allow larger buffer sizes
> drm: bridge/dw_hdmi-ahb-audio: basic support for multi-channel PCM audio
> drm: bridge/dw_hdmi-ahb-audio: parse ELD from HDMI driver
> drm: bridge/dw_hdmi-ahb-audio: add audio driver
> drm: bridge/dw_hdmi: improve HDMI enable/disable handling
> drm: bridge/dw_hdmi: add connector mode forcing
> drm: bridge/dw_hdmi: add support for interlaced video modes
> gpu: imx: fix support for interlaced modes
> gpu: imx: simplify sync polarity setting
> 
> I haven't yet decided what, if anything, from that stack I'm going to
> try to get into the next merge window.  Given the lack of interest last
> time I posted these patches, I'm loosing interest myself in trying to
> get them merged, especially ones which are getting on for being 2 years
> old.

I'm still very interested to see at least the "gpu: imx: fix support for
interlaced modes" and "gpu: imx: simplify sync polarity setting" merged.
May I take them into the imx-drm tree separately?

Or, if I can influence your decision in this matter, I'd prefer if you
could once more resend last month's series with Thierry in Cc:, and he'd
either queue them with my Ack for the imx-drm patches or give his Ack
for you or me to queue them.

regards
Philipp

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