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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241001-b4-master-24-11-25-ov08x40-v2-1-e478976b20c1@linaro.org> References: <20241001-b4-master-24-11-25-ov08x40-v2-0-e478976b20c1@linaro.org> In-Reply-To: <20241001-b4-master-24-11-25-ov08x40-v2-0-e478976b20c1@linaro.org> To: Sakari Ailus , Jason Chen , Mauro Carvalho Chehab , Sergey Senozhatsky , Hans Verkuil , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Bryan O'Donoghue , stable@vger.kernel.org X-Mailer: b4 0.15-dev-dedf8 X-Developer-Signature: v=1; a=openpgp-sha256; l=2802; i=bryan.odonoghue@linaro.org; h=from:subject:message-id; bh=vTwVvG8iZlHzHza+YS67mEwp2zyunt+kNzBDYWtFYWc=; b=owEBbQKS/ZANAwAIASJxO7Ohjcg6AcsmYgBm+/YH9ifjoLl/q8cwHxx2jKcu3VxWfPPCtvJZo /m1Al51PXiJAjMEAAEIAB0WIQTmk/sqq6Nt4Rerb7QicTuzoY3IOgUCZvv2BwAKCRAicTuzoY3I OgtSD/9f5tponllpWndL3ew/MCurWWz4cP041CVQGSjiHOQLs4LBamTk9/p9sKU4bS/o4gjHUHg agBB5f9rog4wQrb6BFR167obvnUf4XWKFTuRBVxpvi+oIBqDITmlhL0BciQPDFGH5Gy/o93WiWO hV4kdU7APdnnB1xyYwPgZWdMfUOHBcw3P3MzGzpfyck6qn0cMg8GTDTbCfBot5vuQVW80vBgtU4 FUWE5Y48bxjGayg9r8UDprRN3byOoZfT3JfCfXcv7ONWqwxJfh7dlXS9OQ2/lRBPMulFifZAU+t lzU1pBGeGFTfh6G4oN9LkI95RyvIv5Yq+uIYwKR6IzIoYJsmU0S1kDUQxf5hm4k1Tk91P4Us4f2 SbO43XBmBJm1Jq7PySQES2XrXUaokra+Y7z5X1NAzhdqpzDOCm49V8blv1s85WoOc4moMuvFJ8c x+m3JlIPyByA1RXvVKwETAlyZxqrD1Ive4nbO9EJytCFY1Onq1bfOxFcO+rLZwADw3en4SHphAO f0a5rQVhjPAN4/0Bj4cR8g+qthITvOQSmL/eySByJfbUapjMNv16pylo44ttjKndKV3Q6+7m02z 5B/cc+hfV/0kJglbUK55B5fy4e/biOlSWjfPlbHG4uyL4LtvX+FRZCIF0gnd0V5qadSIje0YsJX v8tM3xQHeUNLcXg== X-Developer-Key: i=bryan.odonoghue@linaro.org; a=openpgp; fpr=E693FB2AABA36DE117AB6FB422713BB3A18DC83A 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 29= 0, 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 # x1e80100-crd Signed-off-by: Bryan O'Donoghue --- 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..be25e45175b1322145dca428e84= 5242d8fea2698 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; } =20 -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 =3D v4l2_get_subdevdata(&ov08x->sd); struct i2c_msg msgs; - size_t i, num_regs; + size_t i; int ret; =20 - num_regs =3D last_reg - first_reg + 1; msgs.addr =3D client->addr; msgs.flags =3D 0; msgs.len =3D 2 + num_regs; @@ -1373,6 +1371,31 @@ static int ov08x40_burst_fill_regs(struct ov08x40 *o= v08x, u16 first_reg, return 0; } =20 +static int ov08x40_burst_fill_regs(struct ov08x40 *ov08x, u16 first_reg, + u16 last_reg, u8 val) +{ + struct i2c_client *client =3D v4l2_get_subdevdata(&ov08x->sd); + size_t num_regs, num_write_regs; + int ret; + + num_regs =3D last_reg - first_reg + 1; + num_write_regs =3D num_regs; + + if (client->adapter->quirks && client->adapter->quirks->max_write_len) + num_write_regs =3D client->adapter->quirks->max_write_len - 2; + + while (first_reg < last_reg) { + ret =3D __ov08x40_burst_fill_regs(client, first_reg, last_reg, + num_write_regs, val); + if (ret) + return ret; + + first_reg +=3D 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) --=20 2.46.2