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Date: Mon, 17 Oct 2016 15:36:14 -0700
From: Steve Longerbeam <slongerbeam@...il.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: lars@...afoo.de, mchehab@...nel.org, linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org,
Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH v4 3/8] media: adv7180: add support for NEWAVMODE
On 10/16/2016 05:18 AM, Laurent Pinchart wrote:
> Hi Steve,
>
> Thank you for the patch.
>
> On Wednesday 03 Aug 2016 11:03:45 Steve Longerbeam wrote:
>> Parse the optional v4l2 endpoint DT node. If the bus type is
>> V4L2_MBUS_BT656 and the endpoint node specifies "newavmode",
>> configure the BT.656 bus in NEWAVMODE.
>>
>> Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
>>
>> ---
>>
>> v4: no changes
>> v3:
>> - the newavmode endpoint property is now private to adv7180.
>> ---
>> .../devicetree/bindings/media/i2c/adv7180.txt | 4 ++
>> drivers/media/i2c/adv7180.c | 46 +++++++++++++++++--
>> 2 files changed, 47 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/media/i2c/adv7180.txt
>> b/Documentation/devicetree/bindings/media/i2c/adv7180.txt index
>> 0d50115..6c175d2 100644
>> --- a/Documentation/devicetree/bindings/media/i2c/adv7180.txt
>> +++ b/Documentation/devicetree/bindings/media/i2c/adv7180.txt
>> @@ -15,6 +15,10 @@ Required Properties :
>> "adi,adv7282"
>> "adi,adv7282-m"
>>
>> +Optional Endpoint Properties :
>> +- newavmode: a boolean property to indicate the BT.656 bus is operating
>> + in Analog Device's NEWAVMODE. Valid for BT.656 busses only.
> This is a vendor-specific property, it should be prefixed with "adi,".
Ok, I'll do that in next version.
> Could
> you also explain how this mode works ? I'd like to make sure it qualifies for
> a DT property.
The blurb in the ADV718x manual is terse:
"When NEWAVMODE is 0 (enabled), EAV/SAV codes are generated to
suit Analog Devices encoders. No adjustments are possible."
"Setting NEWAVMODE to 1 (default) enables the manual position
of the VSYNC, FIELD, and AV codes using Register 0x32 to
Register 0x33 and Register 0xE5 to Register 0xEA. Default register
settings are CCIR656 compliant;"
So it's not clear to me how the generated EAV and SAV codes are
different from standard CCIR656, but apparently they are.
Steve
>
>> +
>> Example:
>>
>> i2c0@...2000 {
>> diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
>> index 6e093c22..467953e 100644
>> --- a/drivers/media/i2c/adv7180.c
>> +++ b/drivers/media/i2c/adv7180.c
>> @@ -31,6 +31,7 @@
>> #include <media/v4l2-event.h>
>> #include <media/v4l2-device.h>
>> #include <media/v4l2-ctrls.h>
>> +#include <media/v4l2-of.h>
>> #include <linux/mutex.h>
>> #include <linux/delay.h>
>>
>> @@ -106,6 +107,7 @@
>> #define ADV7180_REG_SHAP_FILTER_CTL_1 0x0017
>> #define ADV7180_REG_CTRL_2 0x001d
>> #define ADV7180_REG_VSYNC_FIELD_CTL_1 0x0031
>> +#define ADV7180_VSYNC_FIELD_CTL_1_NEWAVMODE 0x02
>> #define ADV7180_REG_MANUAL_WIN_CTL_1 0x003d
>> #define ADV7180_REG_MANUAL_WIN_CTL_2 0x003e
>> #define ADV7180_REG_MANUAL_WIN_CTL_3 0x003f
>> @@ -214,6 +216,7 @@ struct adv7180_state {
>> struct mutex mutex; /* mutual excl. when accessing chip */
>> int irq;
>> v4l2_std_id curr_norm;
>> + bool newavmode;
>> bool powered;
>> bool streaming;
>> u8 input;
>> @@ -864,9 +867,15 @@ static int adv7180_init(struct adv7180_state *state)
>> if (ret < 0)
>> return ret;
>>
>> - /* Manually set V bit end position in NTSC mode */
>> - return adv7180_write(state, ADV7180_REG_NTSC_V_BIT_END,
>> - ADV7180_NTSC_V_BIT_END_MANUAL_NVEND);
>> + if (!state->newavmode) {
>> + /* Manually set V bit end position in NTSC mode */
>> + ret = adv7180_write(state, ADV7180_REG_NTSC_V_BIT_END,
>> + ADV7180_NTSC_V_BIT_END_MANUAL_NVEND);
>> + if (ret < 0)
>> + return ret;
>> + }
>> +
>> + return 0;
>> }
>>
>> static int adv7180_set_std(struct adv7180_state *state, unsigned int std)
>> @@ -1217,6 +1226,13 @@ static int init_device(struct adv7180_state *state)
>> if (ret)
>> goto out_unlock;
>>
>> + if (state->newavmode) {
>> + ret = adv7180_write(state, ADV7180_REG_VSYNC_FIELD_CTL_1,
>> + ADV7180_VSYNC_FIELD_CTL_1_NEWAVMODE);
>> + if (ret < 0)
>> + goto out_unlock;
>> + }
>> +
>> ret = adv7180_program_std(state);
>> if (ret)
>> goto out_unlock;
>> @@ -1257,6 +1273,28 @@ out_unlock:
>> return ret;
>> }
>>
>> +static void adv7180_of_parse(struct adv7180_state *state)
>> +{
>> + struct i2c_client *client = state->client;
>> + struct device_node *np = client->dev.of_node;
>> + struct device_node *endpoint;
>> + struct v4l2_of_endpoint ep;
>> +
>> + endpoint = of_graph_get_next_endpoint(np, NULL);
>> + if (!endpoint) {
>> + v4l_warn(client, "endpoint node not found\n");
>> + return;
>> + }
>> +
>> + v4l2_of_parse_endpoint(endpoint, &ep);
>> + if (ep.bus_type == V4L2_MBUS_BT656) {
>> + if (of_property_read_bool(endpoint, "newavmode"))
>> + state->newavmode = true;
>> + }
>> +
>> + of_node_put(endpoint);
>> +}
>> +
>> static int adv7180_probe(struct i2c_client *client,
>> const struct i2c_device_id *id)
>> {
>> @@ -1279,6 +1317,8 @@ static int adv7180_probe(struct i2c_client *client,
>> state->field = V4L2_FIELD_ALTERNATE;
>> state->chip_info = (struct adv7180_chip_info *)id->driver_data;
>>
>> + adv7180_of_parse(state);
>> +
>> if (state->chip_info->flags & ADV7180_FLAG_MIPI_CSI2) {
>> state->csi_client = i2c_new_dummy(client->adapter,
>> ADV7180_DEFAULT_CSI_I2C_ADDR);
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