Santiago, Kevin, > -----Original Message----- > From: Kevin Hilman [mailto:khil...@deeprootsystems.com] > Sent: Monday, October 26, 2009 5:35 PM > To: santiago.nu...@ridgerun.com > Cc: Narnakaje, Snehaprabha; davinci-linux-open- > sou...@linux.davincidsp.com; todd.fisc...@ridgerun.com; linux- > me...@vger.kernel.org > Subject: Re: [PATCH 2/6 v5] Support for TVP7002 in dm365 board > > Santiago Nunez-Corrales <snu...@ridgerun.com> writes: > > > Kevin Hilman wrote: > >> <santiago.nu...@ridgerun.com> writes: > >> > >> > >>> From: Santiago Nunez-Corrales <santiago.nu...@ridgerun.com> > >>> > >>> This patch provides support for TVP7002 in architecture definitions > >>> within DM365. > >>> > >>> Signed-off-by: Santiago Nunez-Corrales <santiago.nu...@ridgerun.com> > >>> --- > >>> arch/arm/mach-davinci/board-dm365-evm.c | 170 > ++++++++++++++++++++++++++++++- > >>> 1 files changed, 166 insertions(+), 4 deletions(-) > >>> > >>> diff --git a/arch/arm/mach-davinci/board-dm365-evm.c b/arch/arm/mach- > davinci/board-dm365-evm.c > >>> index a1d5e7d..6c544d3 100644 > >>> --- a/arch/arm/mach-davinci/board-dm365-evm.c > >>> +++ b/arch/arm/mach-davinci/board-dm365-evm.c > >>> @@ -38,6 +38,11 @@ > >>> #include <mach/common.h> > >>> #include <mach/mmc.h> > >>> #include <mach/nand.h> > >>> +#include <mach/gpio.h> > >>> +#include <linux/videodev2.h> > >>> +#include <media/tvp514x.h> > >>> +#include <media/tvp7002.h> > >>> +#include <media/davinci/videohd.h> > >>> static inline int have_imager(void) > >>> @@ -48,8 +53,11 @@ static inline int have_imager(void) > >>> static inline int have_tvp7002(void) > >>> { > >>> - /* REVISIT when it's supported, trigger via Kconfig */ > >>> +#ifdef CONFIG_VIDEO_TVP7002 > >>> + return 1; > >>> +#else > >>> return 0; > >>> +#endif > >>> > >> > >> I've said this before, but I'll say it again. I don't like the > >> #ifdef-on-Kconfig-option here. > >> > >> Can you add a probe hook to the platform_data so that when the tvp7002 > >> is found it can call pdata->probe() which could then set a flag > >> for use by have_tvp7002(). > >> > >> This will have he same effect without the ifdef since if the driver > >> is not compiled in, its probe can never be triggered. > >> > >> Kevin > >> > >> > > Kevin, > > > > I've been working on this particular implementation. This > > board-dm365-evm.c is specific to the board, therefore I don't still > > get the point of not having those values wired to the board file, but > > I know it'd be nice to have the CPLD configuration triggered upon > > TVP7002 detection. I see two options: > > Having them in the board file is appropriate, what I object to is the > selection by Kconfig. Run-time detection is always preferred when > possible.
We have this CPLD init API - evm_init_cpld() called from the dm365_evm_init() function. The CPLD init API was trying to initialize the CPLD, based on the default configuration. I believe David Brownell had this placeholder for have_imager() and have_tvp7002() APIs since, we have different CPLD settings for the imager, tvp7002 and tvp5146 for the video input source. > > > 1. Do the callback function inside pdata and initialize it at driver > > load time (tvp7002_probe). Set tvp5146 as default and override when > > driver loads (and restore when unloads). > > This is the preferred option to me. We can decide on the default video input source to be TVP5146. However we do not need a new callback function. We already have the VPFE .setup_input callback API dm365evm_setup_video_input() for the same purpose. The VPFE .setup_input API is called when each of the decoders (sub-devices) registered with VPFE capture driver. It is also called when the application decides on an input source and switches between the input sources. So, TVP5146 remains as the default video input source, only until VPFE probe is called, which registers the all decoders (sub-devices) defined in the VPFE platform data. This also means that the last decoder in the VPFE platform data remains active after boot-up. One can change the order in the VPFE platform data if a particular input source needs to remain active after boot-up. Note that application can always switch the input-source at run time. I quickly tried removing the have_imager() construct in the evm_init_cpld() and here is the output - Starting kernel ... Uncompressing Linux............................................................................................... ........................................ done, booting the kernel. Linux version 2.6.32-rc2-davinci1-dirty ... CPU: Testing write buffer coherency: ok DaVinci: 8 gpio irqs NET: Registered protocol family 16 EVM: tvp5146 SD video input bio: create slab <bio-0> at 0 SCSI subsystem initialized ... vpfe_init vpfe-capture: vpss clock vpss_master enabled vpfe-capture vpfe-capture: v4l2 device registered vpfe-capture vpfe-capture: video device registered EVM: switch to tvp5146 SD video input tvp514x 1-005d: tvp514x 1-005d decoder driver registered !! vpfe-capture vpfe-capture: v4l2 sub device tvp5146 registered EVM: switch to tvp7002 HD video input tvp7002 1-005c: tvp7002 1-005c decoder driver registered !! vpfe-capture vpfe-capture: v4l2 sub device tvp7002 registered ths7353 1-002e: chip found @ 0x5c (DaVinci I2C adapter) vpfe-capture vpfe-capture: v4l2 sub device ths7353 registered ... As you can see, the default video input source is TVP5146 and it has been video input source has been switched to TVP7002. Thanks Sneha > > > 2. Add an entry to sysfs such that it can be user-configurable whether > > to activate one of the other regardless of whether tvp5156 or tvp7002 > > are actually there (the only result would be fail to access the > > device). > > Why do you need sysfs options for switching? Wouldn't building as > modules and loading/unloading the needed modules serve the same > purpose? > > Remeber that the 'probe' isn't going to be called until the > platform_driver > is registered, and that will (usually) happen at module load time. > > > Sneha, do you have any suggestions on this one? > > Kevin > -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
