@@ -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)
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(-)