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| author | Peter Fink <pfink@christ-es.de> | 2021-12-07 21:43:24 +0300 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2022-03-10 11:49:15 +0300 |
| commit | eb9fa77a4211cd74d761c46627ac343916fb854e (patch) | |
| tree | d52bf0812149d01fefee120224acf37aaeec1730 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | 26949ac935e37ad47fbe35cf0ff6e51aeeb15c6f (diff) | |
| download | linux-eb9fa77a4211cd74d761c46627ac343916fb854e.tar.xz | |
can: gs_usb: add usb quirk for NXP LPC546xx controllers
Introduce a workaround for a NXP chip errata on LPC546xx
controllers (Errata sheet LPC546xx / USB.15).
According to the document corruption can occur when the following
conditions are met:
* A TX (IN) transfer happens after a RX (OUT) transfer.
* The RX (OUT) transfer length is 4 + N * 16 (N >= 0) bytes.
Even though the struct gs_host_frame has a size of 76 bytes for a FD
frame, which does not apply to the above rule, corruption could be
seen.
Adding a dummy byte to break the second condition also on transfer
lengths with 4 + N * 8 bytes reliably circumvents USB transfer data
corruption.
The firmware can now request this quirk by setting
GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX.
Link: https://lore.kernel.org/all/20220309124132.291861-17-mkl@pengutronix.de
Signed-off-by: Peter Fink <pfink@christ-es.de>
Signed-off-by: Christoph Möhring <cmoehring@christ-es.de>
Signed-off-by: Alexander Schartner <aschartner@christ-es.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions