This series brings fixes and updates to ov08x40 which allows for use of this sensor on the Qualcomm x1e80100 CRD but also on any other dts based system.
Firstly there's a fix for the pseudo burst mode code that was added in 8f667d202384 ("media: ov08x40: Reduce start streaming time"). Not every I2C controller can handle an arbitrary sized write, this is the case on Qualcomm CAMSS/CCI I2C sensor interfaces which limit the transaction size and communicate this limit via I2C quirks. A simple fix to optionally break up the large submitted burst into chunks not exceeding adapter->quirk size fixes.
Secondly then is addition of a yaml description for the ov08x40 and extension of the driver to support OF probe and powering on of the power rails from the driver instead of from ACPI.
Once done the sensor works without further modification on the Qualcomm x1e80100 CRD.
Signed-off-by: Bryan O'Donoghue bryan.odonoghue@linaro.org --- Bryan O'Donoghue (4): media: ov08x40: Fix burst write sequence media: dt-bindings: Add OmniVision OV08X40 media: ov08x40: Rename ext_clk to xvclk media: ov08x40: Add OF probe support
.../bindings/media/i2c/ovti,ov08x40.yaml | 130 ++++++++++++++++ drivers/media/i2c/ov08x40.c | 172 ++++++++++++++++++--- 2 files changed, 283 insertions(+), 19 deletions(-) --- base-commit: 2b7275670032a98cba266bd1b8905f755b3e650f change-id: 20240926-b4-master-24-11-25-ov08x40-c6f477aaa6a4
Best regards,
It is necessary to account for I2C quirks in the burst mode path of this driver. Not all I2C controllers can accept arbitrarily long writes and this is represented in the quirks field of the adapter structure.
Prior to this patch the following error message is seen on a Qualcomm X1E80100 CRD.
[ 38.773524] i2c i2c-2: adapter quirk: msg too long (addr 0x0036, size 290, write) [ 38.781454] ov08x40 2-0036: Failed regs transferred: -95 [ 38.787076] ov08x40 2-0036: ov08x40_start_streaming failed to set regs
Fix the error by breaking up the write sequence into the advertised maximum write size of the quirks field if the quirks field is populated.
Fixes: 8f667d202384 ("media: ov08x40: Reduce start streaming time") Cc: stable@vger.kernel.org # v6.9+ Tested-by: Bryan O'Donoghue bryan.odonoghue@linaro.org # x1e80100-crd Signed-off-by: Bryan O'Donoghue bryan.odonoghue@linaro.org --- drivers/media/i2c/ov08x40.c | 33 ++++++++++++++++++++++++++++----- 1 file changed, 28 insertions(+), 5 deletions(-)
diff --git a/drivers/media/i2c/ov08x40.c b/drivers/media/i2c/ov08x40.c index 48df077522ad0bb2b5f64a6def8844c02af6a193..be25e45175b1322145dca428e845242d8fea2698 100644 --- a/drivers/media/i2c/ov08x40.c +++ b/drivers/media/i2c/ov08x40.c @@ -1339,15 +1339,13 @@ static int ov08x40_read_reg(struct ov08x40 *ov08x, return 0; }
-static int ov08x40_burst_fill_regs(struct ov08x40 *ov08x, u16 first_reg, - u16 last_reg, u8 val) +static int __ov08x40_burst_fill_regs(struct i2c_client *client, u16 first_reg, + u16 last_reg, size_t num_regs, u8 val) { - struct i2c_client *client = v4l2_get_subdevdata(&ov08x->sd); struct i2c_msg msgs; - size_t i, num_regs; + size_t i; int ret;
- num_regs = last_reg - first_reg + 1; msgs.addr = client->addr; msgs.flags = 0; msgs.len = 2 + num_regs; @@ -1373,6 +1371,31 @@ static int ov08x40_burst_fill_regs(struct ov08x40 *ov08x, u16 first_reg, return 0; }
+static int ov08x40_burst_fill_regs(struct ov08x40 *ov08x, u16 first_reg, + u16 last_reg, u8 val) +{ + struct i2c_client *client = v4l2_get_subdevdata(&ov08x->sd); + size_t num_regs, num_write_regs; + int ret; + + num_regs = last_reg - first_reg + 1; + num_write_regs = num_regs; + + if (client->adapter->quirks && client->adapter->quirks->max_write_len) + num_write_regs = client->adapter->quirks->max_write_len - 2; + + while (first_reg < last_reg) { + ret = __ov08x40_burst_fill_regs(client, first_reg, last_reg, + num_write_regs, val); + if (ret) + return ret; + + first_reg += num_write_regs; + } + + return 0; +} + /* Write registers up to 4 at a time */ static int ov08x40_write_reg(struct ov08x40 *ov08x, u16 reg, u32 len, u32 __val)
linux-stable-mirror@lists.linaro.org
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Bryan O'Donoghue