| Message ID | 20210412093451.14198-11-jacopo+renesas@jmondi.org (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Kieran Bingham |
| Headers | show |
| Series | media: gmsl: Reliability improvements | expand |
Hi Jacopo, Thank you for the patch. On Mon, Apr 12, 2021 at 11:34:44AM +0200, Jacopo Mondi wrote: > The current RDACM21 initialization routine powers up the OV10640 image > sensor after the OV490 ISP. The ISP is programmed with a firmare loaded > from an embedded serial flash that (most probably) tries to interact and > program also the image sensor connected to the ISP. > > As described in commit ("media: i2c: rdacm21: Fix OV10640 powerup") the s/[()]//g > image sensor powerdown signal is kept high by an internal pull up > resistor and occasionally fails to startup correctly if the powerdown > line is not asserted explicitely. Failures in the OV10640 startup causes > the OV490 firmware to fail to boot correctly resulting in the camera > module initialization to fail consequentially. > > Fix this by powering up the OV10640 image sensor before testing the > OV490 firmware boot completion, by splitting the ov10640_initialize() > function in an ov10640_power_up() one and an ov10640_check_id() one. > > Also make sure the OV10640 identification procedure gives enough time to > the image sensor to resume after the programming phase performed by the > OV490 firmware by repeating the ID read procedure. > > This commit fixes a sporadic start-up error triggered by a failure to > detect the OV490 firmware boot completion: > rdacm21 8-0054: Timeout waiting for firmware boot > > Fixes: a59f853b3b4b ("media: i2c: Add driver for RDACM21 camera module") > Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > --- > drivers/media/i2c/rdacm21.c | 46 ++++++++++++++++++++++++++----------- > 1 file changed, 32 insertions(+), 14 deletions(-) > > diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c > index 7c0a4a84340a..43c41cb800a4 100644 > --- a/drivers/media/i2c/rdacm21.c > +++ b/drivers/media/i2c/rdacm21.c > @@ -69,6 +69,7 @@ > #define OV490_ISP_VSIZE_LOW 0x80820062 > #define OV490_ISP_VSIZE_HIGH 0x80820063 > > +#define OV10640_PID_TIMEOUT 20 > #define OV10640_ID_HIGH 0xa6 > #define OV10640_CHIP_ID 0x300a > #define OV10640_PIXEL_RATE 55000000 > @@ -329,10 +330,8 @@ static const struct v4l2_subdev_ops rdacm21_subdev_ops = { > .pad = &rdacm21_subdev_pad_ops, > }; > > -static int ov10640_initialize(struct rdacm21_device *dev) > +static void ov10640_power_up(struct rdacm21_device *dev) > { > - u8 val; > - > /* Enable GPIO0#0 (reset) and GPIO1#0 (pwdn) as output lines. */ > ov490_write_reg(dev, OV490_GPIO_SEL0, OV490_GPIO0); > ov490_write_reg(dev, OV490_GPIO_SEL1, OV490_SPWDN0); > @@ -347,18 +346,35 @@ static int ov10640_initialize(struct rdacm21_device *dev) > usleep_range(1500, 3000); > ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE0, OV490_GPIO0); > usleep_range(3000, 5000); > +} > > - /* Read OV10640 ID to test communications. */ > - ov490_write_reg(dev, OV490_SCCB_SLAVE0_DIR, OV490_SCCB_SLAVE_READ); > - ov490_write_reg(dev, OV490_SCCB_SLAVE0_ADDR_HIGH, OV10640_CHIP_ID >> 8); > - ov490_write_reg(dev, OV490_SCCB_SLAVE0_ADDR_LOW, OV10640_CHIP_ID & 0xff); > - > - /* Trigger SCCB slave transaction and give it some time to complete. */ > - ov490_write_reg(dev, OV490_HOST_CMD, OV490_HOST_CMD_TRIGGER); > - usleep_range(1000, 1500); > +static int ov10640_check_id(struct rdacm21_device *dev) > +{ > + unsigned int i; > + u8 val; > > - ov490_read_reg(dev, OV490_SCCB_SLAVE0_DIR, &val); > - if (val != OV10640_ID_HIGH) { > + /* Read OV10640 ID to test communications. */ > + for (i = 0; i < OV10640_PID_TIMEOUT; ++i) { > + ov490_write_reg(dev, OV490_SCCB_SLAVE0_DIR, > + OV490_SCCB_SLAVE_READ); > + ov490_write_reg(dev, OV490_SCCB_SLAVE0_ADDR_HIGH, > + OV10640_CHIP_ID >> 8); > + ov490_write_reg(dev, OV490_SCCB_SLAVE0_ADDR_LOW, > + OV10640_CHIP_ID & 0xff); > + > + /* > + * Trigger SCCB slave transaction and give it some time > + * to complete. > + */ > + ov490_write_reg(dev, OV490_HOST_CMD, OV490_HOST_CMD_TRIGGER); > + usleep_range(1000, 1500); > + > + ov490_read_reg(dev, OV490_SCCB_SLAVE0_DIR, &val); > + if (val == OV10640_ID_HIGH) > + break; > + usleep_range(1000, 1500); > + } > + if (i == OV10640_PID_TIMEOUT) { > dev_err(dev->dev, "OV10640 ID mismatch: (0x%02x)\n", val); > return -ENODEV; > } > @@ -374,6 +390,8 @@ static int ov490_initialize(struct rdacm21_device *dev) > unsigned int i; > int ret; > > + ov10640_power_up(dev); > + > /* > * Read OV490 Id to test communications. Give it up to 40msec to > * exit from reset. > @@ -411,7 +429,7 @@ static int ov490_initialize(struct rdacm21_device *dev) > return -ENODEV; > } > > - ret = ov10640_initialize(dev); > + ret = ov10640_check_id(dev); > if (ret) > return ret; >
diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c index 7c0a4a84340a..43c41cb800a4 100644 --- a/drivers/media/i2c/rdacm21.c +++ b/drivers/media/i2c/rdacm21.c @@ -69,6 +69,7 @@ #define OV490_ISP_VSIZE_LOW 0x80820062 #define OV490_ISP_VSIZE_HIGH 0x80820063 +#define OV10640_PID_TIMEOUT 20 #define OV10640_ID_HIGH 0xa6 #define OV10640_CHIP_ID 0x300a #define OV10640_PIXEL_RATE 55000000 @@ -329,10 +330,8 @@ static const struct v4l2_subdev_ops rdacm21_subdev_ops = { .pad = &rdacm21_subdev_pad_ops, }; -static int ov10640_initialize(struct rdacm21_device *dev) +static void ov10640_power_up(struct rdacm21_device *dev) { - u8 val; - /* Enable GPIO0#0 (reset) and GPIO1#0 (pwdn) as output lines. */ ov490_write_reg(dev, OV490_GPIO_SEL0, OV490_GPIO0); ov490_write_reg(dev, OV490_GPIO_SEL1, OV490_SPWDN0); @@ -347,18 +346,35 @@ static int ov10640_initialize(struct rdacm21_device *dev) usleep_range(1500, 3000); ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE0, OV490_GPIO0); usleep_range(3000, 5000); +} - /* Read OV10640 ID to test communications. */ - ov490_write_reg(dev, OV490_SCCB_SLAVE0_DIR, OV490_SCCB_SLAVE_READ); - ov490_write_reg(dev, OV490_SCCB_SLAVE0_ADDR_HIGH, OV10640_CHIP_ID >> 8); - ov490_write_reg(dev, OV490_SCCB_SLAVE0_ADDR_LOW, OV10640_CHIP_ID & 0xff); - - /* Trigger SCCB slave transaction and give it some time to complete. */ - ov490_write_reg(dev, OV490_HOST_CMD, OV490_HOST_CMD_TRIGGER); - usleep_range(1000, 1500); +static int ov10640_check_id(struct rdacm21_device *dev) +{ + unsigned int i; + u8 val; - ov490_read_reg(dev, OV490_SCCB_SLAVE0_DIR, &val); - if (val != OV10640_ID_HIGH) { + /* Read OV10640 ID to test communications. */ + for (i = 0; i < OV10640_PID_TIMEOUT; ++i) { + ov490_write_reg(dev, OV490_SCCB_SLAVE0_DIR, + OV490_SCCB_SLAVE_READ); + ov490_write_reg(dev, OV490_SCCB_SLAVE0_ADDR_HIGH, + OV10640_CHIP_ID >> 8); + ov490_write_reg(dev, OV490_SCCB_SLAVE0_ADDR_LOW, + OV10640_CHIP_ID & 0xff); + + /* + * Trigger SCCB slave transaction and give it some time + * to complete. + */ + ov490_write_reg(dev, OV490_HOST_CMD, OV490_HOST_CMD_TRIGGER); + usleep_range(1000, 1500); + + ov490_read_reg(dev, OV490_SCCB_SLAVE0_DIR, &val); + if (val == OV10640_ID_HIGH) + break; + usleep_range(1000, 1500); + } + if (i == OV10640_PID_TIMEOUT) { dev_err(dev->dev, "OV10640 ID mismatch: (0x%02x)\n", val); return -ENODEV; } @@ -374,6 +390,8 @@ static int ov490_initialize(struct rdacm21_device *dev) unsigned int i; int ret; + ov10640_power_up(dev); + /* * Read OV490 Id to test communications. Give it up to 40msec to * exit from reset. @@ -411,7 +429,7 @@ static int ov490_initialize(struct rdacm21_device *dev) return -ENODEV; } - ret = ov10640_initialize(dev); + ret = ov10640_check_id(dev); if (ret) return ret;
The current RDACM21 initialization routine powers up the OV10640 image sensor after the OV490 ISP. The ISP is programmed with a firmare loaded from an embedded serial flash that (most probably) tries to interact and program also the image sensor connected to the ISP. As described in commit ("media: i2c: rdacm21: Fix OV10640 powerup") the image sensor powerdown signal is kept high by an internal pull up resistor and occasionally fails to startup correctly if the powerdown line is not asserted explicitely. Failures in the OV10640 startup causes the OV490 firmware to fail to boot correctly resulting in the camera module initialization to fail consequentially. Fix this by powering up the OV10640 image sensor before testing the OV490 firmware boot completion, by splitting the ov10640_initialize() function in an ov10640_power_up() one and an ov10640_check_id() one. Also make sure the OV10640 identification procedure gives enough time to the image sensor to resume after the programming phase performed by the OV490 firmware by repeating the ID read procedure. This commit fixes a sporadic start-up error triggered by a failure to detect the OV490 firmware boot completion: rdacm21 8-0054: Timeout waiting for firmware boot Fixes: a59f853b3b4b ("media: i2c: Add driver for RDACM21 camera module") Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> --- drivers/media/i2c/rdacm21.c | 46 ++++++++++++++++++++++++++----------- 1 file changed, 32 insertions(+), 14 deletions(-)