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| author | Grygorii Strashko <grygorii.strashko@ti.com> | 2015-12-21 11:54:46 -0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2016-01-25 15:15:37 -0200 |
| commit | 2e490139b137bbac3250d594cef3dcbc461ad4cc (patch) | |
| tree | bc5b2a7886e474d0a7ad77cd78798d7ffb656be9 /drivers/media/i2c | |
| parent | d5441ea58ccc70637b75b035dee61685b516a5ca (diff) | |
| download | linux-stable-2e490139b137bbac3250d594cef3dcbc461ad4cc.tar.gz linux-stable-2e490139b137bbac3250d594cef3dcbc461ad4cc.tar.bz2 linux-stable-2e490139b137bbac3250d594cef3dcbc461ad4cc.zip | |
[media] media: i2c: ov2659: speedup probe if no device connected
The ov2659 driver performs device detection and initialization in the
following way:
- send reset command REG_SOFTWARE_RESET
- load array of predefined register's setting (~150 values)
- read device version REG_SC_CHIP_ID_H/REG_SC_CHIP_ID_L
- check version and exit if invalid.
As result, for not connected device there will be >~150 i2c transactions
executed before device version checking and exit (there are no
failures detected because ov2659 declared as I2C_CLIENT_SCCB and NACKs
are ignored in this case).
Let's fix that by checking the chip version first and start
initialization only if it's supported.
Cc: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media/i2c')
| -rw-r--r-- | drivers/media/i2c/ov2659.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/media/i2c/ov2659.c b/drivers/media/i2c/ov2659.c index 02b9a3440557..1f999e9c0118 100644 --- a/drivers/media/i2c/ov2659.c +++ b/drivers/media/i2c/ov2659.c @@ -1321,10 +1321,6 @@ static int ov2659_detect(struct v4l2_subdev *sd) } usleep_range(1000, 2000); - ret = ov2659_init(sd, 0); - if (ret < 0) - return ret; - /* Check sensor revision */ ret = ov2659_read(client, REG_SC_CHIP_ID_H, &pid); if (!ret) @@ -1338,8 +1334,10 @@ static int ov2659_detect(struct v4l2_subdev *sd) dev_err(&client->dev, "Sensor detection failed (%04X, %d)\n", id, ret); - else + else { dev_info(&client->dev, "Found OV%04X sensor\n", id); + ret = ov2659_init(sd, 0); + } } return ret; |