Message-ID: <CA+V-a8t4oCTrE0feD+qOTO8oq4vi0d-2qX6CJjN4EF3AoTuMCQ@mail.gmail.com>
Date:	Tue, 25 Sep 2012 12:04:03 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Hans Verkuil <hverkuil@...all.nl>
Cc:	LMML <linux-media@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Sekhar Nori <nsekhar@...com>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	VGER <linux-kernel@...r.kernel.org>,
	"Lad, Prabhakar" <prabhakar.lad@...com>,
	Manjunath Hadli <manjunath.hadli@...com>,
	Hans Verkuil <hans.verkuil@...co.com>
Subject: Re: [PATCH v2] media: davinci: vpif: display: separate out subdev
 from output

Hi Hans,

On Tue, Sep 25, 2012 at 11:59 AM, Hans Verkuil <hverkuil@...all.nl> wrote:
> On Tue September 25 2012 07:38:12 Prabhakar Lad wrote:
>> Hi Hans,
>>
>> On Mon, Sep 24, 2012 at 7:02 PM, Hans Verkuil <hverkuil@...all.nl> wrote:
>> > On Mon September 24 2012 15:21:44 Prabhakar Lad wrote:
>> >> Hi Hans,
>> >>
>> >> On Mon, Sep 24, 2012 at 5:20 PM, Hans Verkuil <hverkuil@...all.nl> wrote:
>> >> > On Mon September 24 2012 12:59:11 Hans Verkuil wrote:
>> >> >> On Mon September 24 2012 12:44:11 Prabhakar wrote:
>> >> >> > From: Lad, Prabhakar <prabhakar.lad@...com>
>> >> >> >
>> >> >> > vpif_display relied on a 1-1 mapping of output and subdev. This is not
>> >> >> > necessarily the case. Separate the two. So there is a list of subdevs
>> >> >> > and a list of outputs. Each output refers to a subdev and has routing
>> >> >> > information. An output does not have to have a subdev.
>> >> >> >
>> >> >> > The initial output for each channel is set to the fist output.
>> >> >> >
>> >> >> > Currently missing is support for associating multiple subdevs with
>> >> >> > an output.
>> >> >> >
>> >> >> > Signed-off-by: Lad, Prabhakar <prabhakar.lad@...com>
>> >> >> > Signed-off-by: Manjunath Hadli <manjunath.hadli@...com>
>> >> >> > Cc: Hans Verkuil <hans.verkuil@...co.com>
>> >> >> > Cc: Sekhar Nori <nsekhar@...com>
>> >> >>
>> >> >> Acked-by: Hans Verkuil <hans.verkuil@...co.com>
>> >> >
>> >> > I'm retracting this Ack. I did see something that wasn't right but I thought
>> >> > it was harmless, but after thinking some more I believe it should be fixed.
>> >> > Luckily, it's easy to fix. See below. Since we need a new version anyway I
>> >> > also added a comment to a few minor issues that can be fixed at the same time.
>> >> >
>> >> >>
>> >> >> Regards,
>> >> >>
>> >> >>       Hans
>> >> >>
>> >> >> > ---
>> >> >> >  This patch is dependent on the patch series from Hans
>> >> >> >  (http://www.mail-archive.com/linux-media@vger.kernel.org/msg52270.html)
>> >> >> >
>> >> >> >  Changes for V2:
>> >> >> >  1: Changed v4l2_device_call_until_err() call to v4l2_subdev_call() for
>> >> >> >     s_routing, since this call is for specific subdev, pointed out by Hans.
>> >> >> >
>> >> >> >  arch/arm/mach-davinci/board-da850-evm.c       |   29 +++++-
>> >> >> >  arch/arm/mach-davinci/board-dm646x-evm.c      |   39 ++++++-
>> >> >> >  drivers/media/platform/davinci/vpif_display.c |  136 ++++++++++++++++++++-----
>> >> >> >  include/media/davinci/vpif_types.h            |   20 +++-
>> >> >> >  4 files changed, 183 insertions(+), 41 deletions(-)
>> >> >> >
>> >> >> > diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c
>> >> >> > index 3081ea4..23a7012 100644
>> >> >> > --- a/arch/arm/mach-davinci/board-da850-evm.c
>> >> >> > +++ b/arch/arm/mach-davinci/board-da850-evm.c
>> >> >> > @@ -46,6 +46,7 @@
>> >> >> >  #include <mach/spi.h>
>> >> >> >
>> >> >> >  #include <media/tvp514x.h>
>> >> >> > +#include <media/adv7343.h>
>> >> >> >
>> >> >> >  #define DA850_EVM_PHY_ID           "davinci_mdio-0:00"
>> >> >> >  #define DA850_LCD_PWR_PIN          GPIO_TO_PIN(2, 8)
>> >> >> > @@ -1257,16 +1258,34 @@ static struct vpif_subdev_info da850_vpif_subdev[] = {
>> >> >> >     },
>> >> >> >  };
>> >> >> >
>> >> >> > -static const char const *vpif_output[] = {
>> >> >> > -           "Composite",
>> >> >> > -           "S-Video",
>> >> >> > +static const struct vpif_output da850_ch0_outputs[] = {
>> >> >> > +   {
>> >> >> > +           .output = {
>> >> >> > +                   .index = 0,
>> >> >> > +                   .name = "Composite",
>> >> >> > +                   .type = V4L2_OUTPUT_TYPE_ANALOG,
>> >> >> > +           },
>> >> >> > +           .subdev_name = "adv7343",
>> >> >> > +           .output_route = ADV7343_COMPOSITE_ID,
>> >> >> > +   },
>> >> >> > +   {
>> >> >> > +           .output = {
>> >> >> > +                   .index = 1,
>> >> >> > +                   .name = "S-Video",
>> >> >> > +                   .type = V4L2_OUTPUT_TYPE_ANALOG,
>> >> >> > +           },
>> >> >> > +           .subdev_name = "adv7343",
>> >> >> > +           .output_route = ADV7343_SVIDEO_ID,
>> >> >> > +   },
>> >> >> >  };
>> >> >> >
>> >> >> >  static struct vpif_display_config da850_vpif_display_config = {
>> >> >> >     .subdevinfo   = da850_vpif_subdev,
>> >> >> >     .subdev_count = ARRAY_SIZE(da850_vpif_subdev),
>> >> >> > -   .output       = vpif_output,
>> >> >> > -   .output_count = ARRAY_SIZE(vpif_output),
>> >> >> > +   .chan_config[0] = {
>> >> >> > +           .outputs = da850_ch0_outputs,
>> >> >> > +           .output_count = ARRAY_SIZE(da850_ch0_outputs),
>> >> >> > +   },
>> >> >> >     .card_name    = "DA850/OMAP-L138 Video Display",
>> >> >> >  };
>> >> >> >
>> >> >> > diff --git a/arch/arm/mach-davinci/board-dm646x-evm.c b/arch/arm/mach-davinci/board-dm646x-evm.c
>> >> >> > index ad249c7..c206768 100644
>> >> >> > --- a/arch/arm/mach-davinci/board-dm646x-evm.c
>> >> >> > +++ b/arch/arm/mach-davinci/board-dm646x-evm.c
>> >> >> > @@ -26,6 +26,7 @@
>> >> >> >  #include <linux/i2c/pcf857x.h>
>> >> >> >
>> >> >> >  #include <media/tvp514x.h>
>> >> >> > +#include <media/adv7343.h>
>> >> >> >
>> >> >> >  #include <linux/mtd/mtd.h>
>> >> >> >  #include <linux/mtd/nand.h>
>> >> >> > @@ -496,18 +497,44 @@ static struct vpif_subdev_info dm646x_vpif_subdev[] = {
>> >> >> >     },
>> >> >> >  };
>> >> >> >
>> >> >> > -static const char *output[] = {
>> >> >> > -   "Composite",
>> >> >> > -   "Component",
>> >> >> > -   "S-Video",
>> >> >> > +static const struct vpif_output dm6467_ch0_outputs[] = {
>> >> >> > +   {
>> >> >> > +           .output = {
>> >> >> > +                   .index = 0,
>> >> >> > +                   .name = "Composite",
>> >> >> > +                   .type = V4L2_OUTPUT_TYPE_ANALOG,
>> >> >> > +           },
>> >> >> > +           .subdev_name = "adv7343",
>> >> >> > +           .output_route = ADV7343_COMPOSITE_ID,
>> >> >> > +   },
>> >> >> > +   {
>> >> >> > +           .output = {
>> >> >> > +                   .index = 1,
>> >> >> > +                   .name = "Component",
>> >> >> > +                   .type = V4L2_OUTPUT_TYPE_ANALOG,
>> >> >> > +           },
>> >> >> > +           .subdev_name = "adv7343",
>> >> >> > +           .output_route = ADV7343_COMPONENT_ID,
>> >> >> > +   },
>> >> >> > +   {
>> >> >> > +           .output = {
>> >> >> > +                   .index = 2,
>> >> >> > +                   .name = "S-Video",
>> >> >> > +                   .type = V4L2_OUTPUT_TYPE_ANALOG,
>> >> >> > +           },
>> >> >> > +           .subdev_name = "adv7343",
>> >> >> > +           .output_route = ADV7343_SVIDEO_ID,
>> >> >> > +   },
>> >> >> >  };
>> >> >> >
>> >> >> >  static struct vpif_display_config dm646x_vpif_display_config = {
>> >> >> >     .set_clock      = set_vpif_clock,
>> >> >> >     .subdevinfo     = dm646x_vpif_subdev,
>> >> >> >     .subdev_count   = ARRAY_SIZE(dm646x_vpif_subdev),
>> >> >> > -   .output         = output,
>> >> >> > -   .output_count   = ARRAY_SIZE(output),
>> >> >> > +   .chan_config[0] = {
>> >> >> > +           .outputs = dm6467_ch0_outputs,
>> >> >> > +           .output_count = ARRAY_SIZE(dm6467_ch0_outputs),
>> >> >> > +   },
>> >> >> >     .card_name      = "DM646x EVM",
>> >> >> >  };
>> >> >> >
>> >> >> > diff --git a/drivers/media/platform/davinci/vpif_display.c b/drivers/media/platform/davinci/vpif_display.c
>> >> >> > index 8d1ce09..f68780f 100644
>> >> >> > --- a/drivers/media/platform/davinci/vpif_display.c
>> >> >> > +++ b/drivers/media/platform/davinci/vpif_display.c
>> >> >> > @@ -308,7 +308,7 @@ static int vpif_start_streaming(struct vb2_queue *vq, unsigned int count)
>> >> >> >             channel2_intr_assert();
>> >> >> >             channel2_intr_enable(1);
>> >> >> >             enable_channel2(1);
>> >> >> > -           if (vpif_config_data->ch2_clip_en)
>> >> >> > +           if (vpif_config_data->chan_config[VPIF_CHANNEL2_VIDEO].clip_en)
>> >> >> >                     channel2_clipping_enable(1);
>> >> >> >     }
>> >> >> >
>> >> >> > @@ -317,7 +317,7 @@ static int vpif_start_streaming(struct vb2_queue *vq, unsigned int count)
>> >> >> >             channel3_intr_assert();
>> >> >> >             channel3_intr_enable(1);
>> >> >> >             enable_channel3(1);
>> >> >> > -           if (vpif_config_data->ch3_clip_en)
>> >> >> > +           if (vpif_config_data->chan_config[VPIF_CHANNEL3_VIDEO].clip_en)
>> >> >> >                     channel3_clipping_enable(1);
>> >> >> >     }
>> >> >> >
>> >> >> > @@ -1174,14 +1174,16 @@ static int vpif_streamoff(struct file *file, void *priv,
>> >> >> >     if (buftype == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
>> >> >> >             /* disable channel */
>> >> >> >             if (VPIF_CHANNEL2_VIDEO == ch->channel_id) {
>> >> >> > -                   if (vpif_config_data->ch2_clip_en)
>> >> >> > +                   if (vpif_config_data->
>> >> >> > +                           chan_config[VPIF_CHANNEL2_VIDEO].clip_en)
>> >> >> >                             channel2_clipping_enable(0);
>> >> >> >                     enable_channel2(0);
>> >> >> >                     channel2_intr_enable(0);
>> >> >> >             }
>> >> >> >             if ((VPIF_CHANNEL3_VIDEO == ch->channel_id) ||
>> >> >> >                                     (2 == common->started)) {
>> >> >> > -                   if (vpif_config_data->ch3_clip_en)
>> >> >> > +                   if (vpif_config_data->
>> >> >> > +                           chan_config[VPIF_CHANNEL3_VIDEO].clip_en)
>> >> >> >                             channel3_clipping_enable(0);
>> >> >> >                     enable_channel3(0);
>> >> >> >                     channel3_intr_enable(0);
>> >> >> > @@ -1214,41 +1216,118 @@ static int vpif_enum_output(struct file *file, void *fh,
>> >> >> >  {
>> >> >> >
>> >> >> >     struct vpif_display_config *config = vpif_dev->platform_data;
>> >> >> > +   struct vpif_display_chan_config *chan_cfg;
>> >> >> > +   struct vpif_fh *vpif_handler = fh;
>> >> >> > +   struct channel_obj *ch = vpif_handler->channel;
>> >> >> >
>> >> >> > -   if (output->index >= config->output_count) {
>> >> >> > +   chan_cfg = &config->chan_config[ch->channel_id];
>> >> >> > +   if (output->index >= chan_cfg->output_count) {
>> >> >> >             vpif_dbg(1, debug, "Invalid output index\n");
>> >> >> >             return -EINVAL;
>> >> >> >     }
>> >> >> >
>> >> >> > -   strcpy(output->name, config->output[output->index]);
>> >> >> > -   output->type = V4L2_OUTPUT_TYPE_ANALOG;
>> >> >> > +   memcpy(output, &chan_cfg->outputs[output->index].output,
>> >> >> > +           sizeof(*output));
>> >> >
>> >> >         *output = chan_cfg->outputs[output->index].output;
>> >> >
>> >> >> >     output->std = VPIF_V4L2_STD;
>> >> >
>> >> Should I move 'VPIF_V4L2_STD' this macro to vpif_types.h ?
>> >
>> > No. VPIF_V4L2_STD == V4L2_STD_ALL, so just use V4L2_STD_ALL directly.
>> >
>> Ok.
>>
>> >> > This should be part of chan_cfg->outputs[output->index].output and not be
>> >> > overridden. If the output is a HDTV output, then std should be 0, otherwise
>> >> > it should be whatever the std is that is supported by the output.
>> >> >
>> >> > Really no different to what we do in vpif_capture.
>> >> >
>> >> Ok
>> >>
>> >> >> >
>> >> >> >     return 0;
>> >> >> >  }
>> >> >> >
>> >> >> > +/**
>> >> >> > + * vpif_output_to_subdev() - Maps output to sub device
>> >> >> > + * @vpif_cfg - global config ptr
>> >> >> > + * @chan_cfg - channel config ptr
>> >> >> > + * @index - Given output index from application
>> >> >> > + *
>> >> >> > + * lookup the sub device information for a given output index.
>> >> >> > + * we report all the output to application. output table also
>> >> >> > + * has sub device name for the each output
>> >> >> > + */
>> >> >> > +static int
>> >> >> > +vpif_output_to_subdev(struct vpif_display_config *vpif_cfg,
>> >> >> > +                 struct vpif_display_chan_config *chan_cfg, int index)
>> >> >> > +{
>> >> >> > +   struct vpif_subdev_info *subdev_info;
>> >> >> > +   const char *subdev_name;
>> >> >> > +   int i;
>> >> >> > +
>> >> >> > +   vpif_dbg(2, debug, "vpif_output_to_subdev\n");
>> >> >> > +
>> >> >> > +   if (chan_cfg->outputs == NULL)
>> >> >> > +           return -1;
>> >> >> > +
>> >> >> > +   subdev_name = chan_cfg->outputs[index].subdev_name;
>> >> >> > +   if (subdev_name == NULL)
>> >> >> > +           return -1;
>> >> >> > +
>> >> >> > +   /* loop through the sub device list to get the sub device info */
>> >> >> > +   for (i = 0; i < vpif_cfg->subdev_count; i++) {
>> >> >> > +           subdev_info = &vpif_cfg->subdevinfo[i];
>> >> >> > +           if (!strcmp(subdev_info->name, subdev_name))
>> >> >> > +                   return i;
>> >> >> > +   }
>> >> >> > +   return -1;
>> >> >> > +}
>> >> >> > +
>> >> >> > +/**
>> >> >> > + * vpif_set_output() - Select an output
>> >> >> > + * @vpif_cfg - global config ptr
>> >> >> > + * @ch - channel
>> >> >> > + * @index - Given output index from application
>> >> >> > + *
>> >> >> > + * Select the given output.
>> >> >> > + */
>> >> >> > +static int vpif_set_output(struct vpif_display_config *vpif_cfg,
>> >> >> > +                 struct channel_obj *ch, int index)
>> >> >> > +{
>> >> >> > +   struct vpif_display_chan_config *chan_cfg =
>> >> >> > +           &vpif_cfg->chan_config[ch->channel_id];
>> >> >> > +   struct vpif_subdev_info *subdev_info = NULL;
>> >> >> > +   struct v4l2_subdev *sd = NULL;
>> >> >> > +   u32 input = 0, output = 0;
>> >> >> > +   int sd_index;
>> >> >> > +   int ret;
>> >> >> > +
>> >> >> > +   sd_index = vpif_output_to_subdev(vpif_cfg, chan_cfg, index);
>> >> >> > +   if (sd_index >= 0) {
>> >> >> > +           sd = vpif_obj.sd[sd_index];
>> >> >> > +           subdev_info = &vpif_cfg->subdevinfo[sd_index];
>> >> >> > +   }
>> >> >> > +
>> >> >> > +   if (sd) {
>> >> >> > +           input = chan_cfg->outputs[index].input_route;
>> >> >> > +           output = chan_cfg->outputs[index].output_route;
>> >> >> > +           ret = v4l2_subdev_call(sd, video, s_routing, input, output, 0);
>> >> >> > +           if (ret < 0) {
>> >> >
>> >> > Replace with:
>> >> >
>> >> >                 if (ret < 0 && ret != -ENOIOCTLCMD) {
>> >> >
>> >> > It's OK if the subdev doesn't support this s_routing operation.
>> >> >
>> >> Ok
>> >>
>> >> >> > +                   vpif_err("Failed to set output\n");
>> >> >> > +                   return ret;
>> >> >> > +           }
>> >> >> > +
>> >> >> > +   }
>> >> >> > +   ch->output_idx = index;
>> >> >> > +   ch->sd = sd;
>> >> >
>> >> > Just like in the capture case you should update tvnorms:
>> >> >
>> >> >         ch->video_dev->tvnorms = chan_cfg->inputs[index].output.std;
>> >> >
>> >> > Make sure tvnorms is no longer set in vpif_video_template.
>> >> > Ditto for current_norm. Since vpif_display.c supports g_std the current_norm
>> >> > field shouldn't be used anymore.
>> >> >
>> >> > The capture case also updates vpifparams.iface:
>> >> >
>> >> >         ch->vpifparams.iface = chan_cfg->vpif_if;
>> >> >
>> >> > Isn't that needed for output as well?
>> >> >
>> >> The iface is never used  in display, so there isnt any necessity to assign it.
>> >
>> > But it is used in vpif.c through vpif_set_video_params()!
>> >
>> Agreed iface is used in vpif_set_video_params(), but it still for capture.
>> there is check 'if (channel_id > 1)' in the function while accessing the iface
>> variable, so for display this will be always true, so no point in assigning it.
>
> True, I missed that. In that case, shouldn't the vpif_if field be removed from
> struct vpif_display_chan_config?
>
Yes it should be removed.

Thanks And Regards,
--Prabhakar Lad

> Regards,
>
>         Hans
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