6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Frank Li <Frank.Li@xxxxxxx> [ Upstream commit e5e3df06ac98d15cfb10bb5c12356709365e91b2 ] In MIPI I3C Specification: "Ninth Bit of SDR Target Returned (Read) Data as End-of-Data: In I2C, the ninth Data bit from Target to Controller is an ACK by the Controller. By contrast, in I3C this bit allows the Target to end a Read, and allows the Controller to Abort a Read. In SDR terms, the ninth bit of Read data is referred to as the T-Bit (for ‘Transition’)" I3C allow devices early terminate data transfer. So need "actual_len" field to indicate how much get by i3c_priv_xfer. Reviewed-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx> Signed-off-by: Frank Li <Frank.Li@xxxxxxx> Link: https://lore.kernel.org/r/20231201222532.2431484-4-Frank.Li@xxxxxxx Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx> Stable-dep-of: 7f3d633b460b ("i3c: master: svc: change ENXIO to EAGAIN when IBI occurs during start frame") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- include/linux/i3c/device.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h index 90fa83464f003..ef6217da8253b 100644 --- a/include/linux/i3c/device.h +++ b/include/linux/i3c/device.h @@ -54,6 +54,7 @@ enum i3c_hdr_mode { * struct i3c_priv_xfer - I3C SDR private transfer * @rnw: encodes the transfer direction. true for a read, false for a write * @len: transfer length in bytes of the transfer + * @actual_len: actual length in bytes are transferred by the controller * @data: input/output buffer * @data.in: input buffer. Must point to a DMA-able buffer * @data.out: output buffer. Must point to a DMA-able buffer @@ -62,6 +63,7 @@ enum i3c_hdr_mode { struct i3c_priv_xfer { u8 rnw; u16 len; + u16 actual_len; union { void *in; const void *out; -- 2.43.0
