Hi Sakari,
Sakari Ailus <sakari.ailus@xxxxxx> writes:
> On Tue, Nov 22, 2016 at 07:52:43AM -0800, Kevin Hilman wrote:
>> Allow getting of subdevs from DT ports and endpoints.
>>
>> The _get_pdata() function was larely inspired by (i.e. stolen from)
>
> vpif_capture_get_pdata and "largely"?
Yes, thanks.
>> am437x-vpfe.c
>>
>> Signed-off-by: Kevin Hilman <khilman@xxxxxxxxxxxx>
>> ---
>> drivers/media/platform/davinci/vpif_capture.c | 130 +++++++++++++++++++++++++-
>> include/media/davinci/vpif_types.h | 9 +-
>> 2 files changed, 133 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
>> index 94ee6cf03f02..47a4699157e7 100644
>> --- a/drivers/media/platform/davinci/vpif_capture.c
>> +++ b/drivers/media/platform/davinci/vpif_capture.c
>> @@ -26,6 +26,8 @@
>> #include <linux/slab.h>
>>
>> #include <media/v4l2-ioctl.h>
>> +#include <media/v4l2-of.h>
>> +#include <media/i2c/tvp514x.h>
>
> Do you need this header?
>
Yes, based on discussion with Hans, since there is no DT binding for
selecting the input pins of the TVP514x, I have to select it in the
driver, so I need the defines from this header. More on this below...
>>
>> #include "vpif.h"
>> #include "vpif_capture.h"
>> @@ -650,6 +652,10 @@ static int vpif_input_to_subdev(
>>
>> vpif_dbg(2, debug, "vpif_input_to_subdev\n");
>>
>> + if (!chan_cfg)
>> + return -1;
>> + if (input_index >= chan_cfg->input_count)
>> + return -1;
>> subdev_name = chan_cfg->inputs[input_index].subdev_name;
>> if (subdev_name == NULL)
>> return -1;
>> @@ -657,7 +663,7 @@ static int vpif_input_to_subdev(
>> /* 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->subdev_info[i];
>> - if (!strcmp(subdev_info->name, subdev_name))
>> + if (subdev_info && !strcmp(subdev_info->name, subdev_name))
>> return i;
>> }
>> return -1;
>> @@ -1327,6 +1333,21 @@ static int vpif_async_bound(struct v4l2_async_notifier *notifier,
>> {
>> int i;
>>
>> + for (i = 0; i < vpif_obj.config->asd_sizes[0]; i++) {
>> + struct v4l2_async_subdev *_asd = vpif_obj.config->asd[i];
>> + const struct device_node *node = _asd->match.of.node;
>> +
>> + if (node == subdev->of_node) {
>> + vpif_obj.sd[i] = subdev;
>> + vpif_obj.config->chan_config->inputs[i].subdev_name =
>> + (char *)subdev->of_node->full_name;
>> + vpif_dbg(2, debug,
>> + "%s: setting input %d subdev_name = %s\n",
>> + __func__, i, subdev->of_node->full_name);
>> + return 0;
>> + }
>> + }
>> +
>> for (i = 0; i < vpif_obj.config->subdev_count; i++)
>> if (!strcmp(vpif_obj.config->subdev_info[i].name,
>> subdev->name)) {
>> @@ -1422,6 +1443,110 @@ static int vpif_async_complete(struct v4l2_async_notifier *notifier)
>> return vpif_probe_complete();
>> }
>>
>> +static struct vpif_capture_config *
>> +vpif_capture_get_pdata(struct platform_device *pdev)
>> +{
>> + struct device_node *endpoint = NULL;
>> + struct v4l2_of_endpoint bus_cfg;
>> + struct vpif_capture_config *pdata;
>> + struct vpif_subdev_info *sdinfo;
>> + struct vpif_capture_chan_config *chan;
>> + unsigned int i;
>> +
>> + dev_dbg(&pdev->dev, "vpif_get_pdata\n");
>> +
>> + if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node)
>> + return pdev->dev.platform_data;
>> +
>> + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
>> + if (!pdata)
>> + return NULL;
>> + pdata->subdev_info =
>> + devm_kzalloc(&pdev->dev, sizeof(*pdata->subdev_info) *
>> + VPIF_CAPTURE_MAX_CHANNELS, GFP_KERNEL);
>> +
>> + if (!pdata->subdev_info)
>> + return NULL;
>> + dev_dbg(&pdev->dev, "%s\n", __func__);
>> +
>> + for (i = 0; ; i++) {
>> + struct device_node *rem;
>> + unsigned int flags;
>> + int err;
>> +
>> + endpoint = of_graph_get_next_endpoint(pdev->dev.of_node,
>> + endpoint);
>> + if (!endpoint)
>> + break;
>> +
>> + sdinfo = &pdata->subdev_info[i];
>
> subdev_info[] has got VPIF_CAPTURE_MAX_CHANNELS entries only.
>
Right, I need to make the loop only go for a max of
VPIF_CAPTURE_MAX_CHANNELS iterations.
>> + chan = &pdata->chan_config[i];
>> + chan->inputs = devm_kzalloc(&pdev->dev,
>> + sizeof(*chan->inputs) *
>> + VPIF_DISPLAY_MAX_CHANNELS,
>> + GFP_KERNEL);
>> +
>> + chan->input_count++;
>> + chan->inputs[i].input.type = V4L2_INPUT_TYPE_CAMERA;
>
> I wonder what's the purpose of using index i on this array as well.
The number of endpoints in DT is the number of input channels configured
(up to a max of VPIF_CAPTURE_MAX_CHANNELS.)
> If you use that to access a corresponding entry in a different array, I'd
> just create a struct that contains the port configuration and the async
> sub-device. The omap3isp driver does that, for instance; see
> isp_of_parse_nodes() in drivers/media/platform/omap3isp/isp.c if you're
> interested. Up to you.
OK, I'll have a look at that driver. The goal here with this series is
just to get this working with DT, but also not break the existing legacy
platform_device support, so I'm trying not to mess with the
driver-interal data structures too much.
>> + chan->inputs[i].input.std = V4L2_STD_ALL;
>> + chan->inputs[i].input.capabilities = V4L2_IN_CAP_STD;
>> +
>> + /* FIXME: need a new property? ch0:composite ch1: s-video */
>> + if (i == 0)
>
> Can you assume that the first endopoint has got a particular kind of input?
> What if it's not connected?
On all the boards I know of (there aren't many using this SoC), it's a
safe assumption.
> If this is a different physical port (not in the meaning another) in the
> device, I'd use the reg property for this. Please see
> Documentation/devicetree/bindings/media/video-interfaces.txt .
My understanding (which is admittedly somewhat fuzzy) of the TVP514x is
that it's not physically a different port. Instead, it's just telling
the TVP514x which pin(s) will be active inputs (and what kind of signal
will be present.)
I'm open to a better way to describe this input select from DT, but
based on what I heard from Hans, there isn't currently a good way to do
that except for in the driver:
(c.f. https://marc.info/?l=linux-arm-kernel&m=147887871615788)
Based on further discussion in that thread, it sounds like there may be
a way forward coming soon, and I'll be glad to switch to that when it
arrives.
>> + chan->inputs[i].input_route = INPUT_CVBS_VI2B;
>> + else
>> + chan->inputs[i].input_route = INPUT_SVIDEO_VI2C_VI1C;
>> + chan->inputs[i].output_route = OUTPUT_10BIT_422_EMBEDDED_SYNC;
>> +
>> + err = v4l2_of_parse_endpoint(endpoint, &bus_cfg);
>> + if (err) {
>> + dev_err(&pdev->dev, "Could not parse the endpoint\n");
>> + goto done;
>> + }
>> + dev_dbg(&pdev->dev, "Endpoint %s, bus_width = %d\n",
>> + endpoint->full_name, bus_cfg.bus.parallel.bus_width);
>> + flags = bus_cfg.bus.parallel.flags;
>> +
>> + if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
>> + chan->vpif_if.hd_pol = 1;
>> +
>> + if (flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
>> + chan->vpif_if.vd_pol = 1;
>> +
>> + chan->vpif_if.if_type = VPIF_IF_BT656;
>> + rem = of_graph_get_remote_port_parent(endpoint);
>> + if (!rem) {
>> + dev_dbg(&pdev->dev, "Remote device at %s not found\n",
>> + endpoint->full_name);
>> + goto done;
>> + }
>> +
>> + dev_dbg(&pdev->dev, "Remote device %s, %s found\n",
>> + rem->name, rem->full_name);
>> + sdinfo->name = rem->full_name;
>> +
>> + pdata->asd[i] = devm_kzalloc(&pdev->dev,
>> + sizeof(struct v4l2_async_subdev),
>> + GFP_KERNEL);
>
> Do you ensure somewhere that i isn't overrunning the pdata->asd[] array?
> It's got VPIF_CAPTURE_MAX_CHANNELS entries.
Oops, no. That will be fixed by making the outer for loop only iterate
for i = i..VPIF_CAPTURE_MAX_CHANNELS.
Thanks for the review,
Kevin
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