linux-kernel - Re: [RESEND PATCH 1/2] ARM: AM43xx: hwmod: add DSS hwmod data

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Message-ID: <20140617073552.GM17845@atomide.com>
Date:	Tue, 17 Jun 2014 00:35:52 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Tomi Valkeinen <tomi.valkeinen@...com>
Cc:	Felipe Balbi <balbi@...com>,
	Benoit Cousson <bcousson@...libre.org>,
	Paul Walmsley <paul@...an.com>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Sathya Prakash M R <sathyap@...com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RESEND PATCH 1/2] ARM: AM43xx: hwmod: add DSS hwmod data

* Tomi Valkeinen <tomi.valkeinen@...com> [140617 00:10]:
> On 16/06/14 12:22, Tony Lindgren wrote:
> > * Felipe Balbi <balbi@...com> [140613 09:17]:
> >> From: Sathya Prakash M R <sathyap@...com>
> >>
> >> Add DSS hwmod data for AM43xx.
> >>
> >> Cc: Andrew Morton <akpm@...ux-foundation.org>
> >> Acked-by: Rajendra Nayak <rnayak@...com>
> >> Signed-off-by: Sathya Prakash M R <sathyap@...com>
> >> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
> >> Signed-off-by: Felipe Balbi <balbi@...com>
> >> ---
> >>
> >> Note that this patch was originally send on May 9th [1], changes were requested
> >> and a new version was sent on May 19th [2], then on May 27th [3] Tomi pinged
> >> maintainer again and go no response.
> >>
> >> Without this patch, we cannot get display working on any AM437x devices.
> >>
> >> [1] http://marc.info/?l=linux-arm-kernel&m=139963677925227&w=2
> >> [2] http://marc.info/?l=linux-arm-kernel&m=140049799425512&w=2
> >> [3] http://marc.info/?l=linux-arm-kernel&m=140117232826754&w=2
> >>
> >>  arch/arm/mach-omap2/omap_hwmod_43xx_data.c | 98 ++++++++++++++++++++++++++++++
> >>  arch/arm/mach-omap2/prcm43xx.h             |  1 +
> >>  2 files changed, 99 insertions(+)
> >>
> >> diff --git a/arch/arm/mach-omap2/omap_hwmod_43xx_data.c b/arch/arm/mach-omap2/omap_hwmod_43xx_data.c
> >> index 5c2cc80..d2a7b6d 100644
> >> --- a/arch/arm/mach-omap2/omap_hwmod_43xx_data.c
> >> +++ b/arch/arm/mach-omap2/omap_hwmod_43xx_data.c
> >> @@ -19,6 +19,8 @@
> >>  #include "omap_hwmod.h"
> >>  #include "omap_hwmod_33xx_43xx_common_data.h"
> >>  #include "prcm43xx.h"
> >> +#include "omap_hwmod_common_data.h"
> >> +
> >>  
> >>  /* IP blocks */
> >>  static struct omap_hwmod am43xx_l4_hs_hwmod = {
> >> @@ -415,6 +417,70 @@ static struct omap_hwmod am43xx_qspi_hwmod = {
> >>  	},
> >>  };
> >>  
> >> +/* Display sub system - DSS */
> >> +
> >> +struct omap_dss_dispc_dev_attr am43xx_dss_dispc_dev_attr = {
> >> +	.manager_count		= 1,
> >> +	.has_framedonetv_irq	= 0
> >> +};
> >> +
> >> +
> >> +static struct omap_hwmod_class_sysconfig am43xx_dispc_sysc = {
> >> +	.rev_offs	= 0x0000,
> >> +	.sysc_offs	= 0x0010,
> >> +	.syss_offs	= 0x0014,
> >> +	.sysc_flags	= (SYSC_HAS_SIDLEMODE | SYSC_HAS_MIDLEMODE),
> >> +	.idlemodes	= (SIDLE_FORCE | SIDLE_NO | SIDLE_SMART),
> >> +	.sysc_fields	= &omap_hwmod_sysc_type1,
> >> +};
> > 
> > Looking at the TRM, "Table 13-43. DISPC_SYSCFG Register Field
> > Descriptions" seems to list the folowing bits available:
> > 
> > 13-12	MIDLEMODE 
> > 9-8	CLOCK_ACTIVITY 
> > 4-3	SIDLEMODE 
> > 2	ENWAKEUP 
> > 1	SOFTRESET 
> > 0	AUTOIDLE 
> > 
> > Have I missed something or how come we don't define them all
> > as available?
> 
> Yes, you're right. I don't see why they shouldn't be there.
> 
> > The .idlemodes available values and .sysc_fields seems to match
> > the TRM.
> 
> Shouldn't idlemodes also have:
> 
> 	MSTANDBY_FORCE | MSTANDBY_NO | MSTANDBY_SMART

Oops yes indeed looking at the MIDDLEDMOE values in addition to
to SIDLEMODE.
 
> I changed the dispc flags to:
> 
> 	.sysc_flags	= (SYSC_HAS_AUTOIDLE | SYSC_HAS_SOFTRESET |
> 		SYSC_HAS_ENAWAKEUP | SYSC_HAS_SIDLEMODE |
> 		SYSC_HAS_CLOCKACTIVITY | SYSC_HAS_MIDLEMODE),
> 	.idlemodes	= (SIDLE_FORCE | SIDLE_NO | SIDLE_SMART |
> 		MSTANDBY_FORCE | MSTANDBY_NO | MSTANDBY_SMART),
> 
> and DSS seems to work fine for me. Then again, I don't think there's any
> proper PM going on (or at least things like debugfs/pm_debug/count shows
> no sensible values), so it could well be that those flags are not even
> used at the moment.

Right. Having these set correctly for devices is pretty much a
requirement for PM to have any chance of working :)

Regards,

Tony
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