linux-kernel - Re: Nokia N900: Broken lirc ir-rx51 driver

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Message-ID: <20160105101841.GI22661@pali>
Date:	Tue, 5 Jan 2016 11:18:41 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Aaro Koskinen <aaro.koskinen@....fi>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Sebastian Reichel <sre@...nel.org>,
	Pavel Machel <pavel@....cz>, Nishanth Menon <nm@...com>,
	Timo Kokkonen <timo.t.kokkonen@....fi>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Nokia N900: Broken lirc ir-rx51 driver

On Saturday 02 January 2016 09:06:57 Tony Lindgren wrote:
> Hi,
> 
> * Pali Rohár <pali.rohar@...il.com> [160102 06:46]:
> > --- a/drivers/media/rc/ir-rx51.c
> > +++ b/drivers/media/rc/ir-rx51.c
> > @@ -25,9 +25,9 @@
> >  #include <linux/platform_device.h>
> >  #include <linux/sched.h>
> >  #include <linux/wait.h>
> > +#include <linux/clk.h>
> >  
> > -#include <plat/dmtimer.h>
> > -#include <plat/clock.h>
> > +#include "../../../arch/arm/plat-omap/include/plat/dmtimer.h"
> 
> Well we don't want to export the dmtimer functions to drivers..But
> we now have the PWM driver that can be already used for most of the
> ir-rx51.c.

Ok. Is PWM driver included in mainline kernel?

> >  #include <media/lirc.h>
> >  #include <media/lirc_dev.h>
> > @@ -208,7 +208,7 @@ static int lirc_rx51_init_port(struct lirc_rx51 *lirc_rx51)
> >  	}
> >  
> >  	clk_fclk = omap_dm_timer_get_fclk(lirc_rx51->pwm_timer);
> > -	lirc_rx51->fclk_khz = clk_fclk->rate / 1000;
> > +	lirc_rx51->fclk_khz = clk_get_rate(clk_fclk) / 1000;
> >  
> >  	return 0;
> >  
> > 
> > So Tony, you are author of that commit (a62a6e98c3) which broke ir-rx51
> > module for Nokia N900. Do you know how to fix this driver for upstream
> > kernel? It would be great to have driver working and not to have it in
> > this dead state...
> 
> Yup please take a look at thread "[PATCH 0/3] pwm: omap: Add PWM support
> using dual-mode timers". Chances are we still need to set up the dmtimer
> code to provide also irqchip functions. That way ir-rx51.c can just do
> request_irq on the selected dmtimer for interrupts.

No I see that patch from that thread uses dmtimer.h from plat-omap. So
it is really OK?

> > Also platform data for this driver are only in legacy board code.
> > Support in DTS is missing, so driver (after fixing above problem) cannot
> > be used on DT booted kernel.
> 
> Yeah those parts should be already doable with the PWM timer code AFAIK.
> 
> Regards,
> 
> Tony
> 
> 

-- 
Pali Rohár
pali.rohar@...il.com
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