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Mon, 16 Oct 2023 08:47:20 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1779927607580500518 X-GMAIL-MSGID: 1779927607580500518 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" field to indicate how much get by i3c_priv_xfer. Signed-off-by: Frank Li --- include/linux/i3c/device.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h index 90fa83464f00..f2fa7ee5d96d 100644 --- a/include/linux/i3c/device.h +++ b/include/linux/i3c/device.h @@ -66,6 +66,7 @@ struct i3c_priv_xfer { void *in; const void *out; } data; + u16 actual; enum i3c_error_code err; };