From: U-Boot u-boot-bounces@lists.denx.de On Behalf Of Paul Barker Sent: Monday, October 9, 2023 5:47 PM
The current SCIF error handling is broken for the RZ/G2L. After a break condition has been triggered, the current code is unable to clear the error and serial port output never resumes.
The RZ/G2L datasheet says that most error conditions are cleared by resetting the relevant error bits in the FSR & LSR registers to zero. To clear framing errors, the invalid data also needs to be read out of the receive FIFO.
After reviewing datasheets for RZ/G2{H,M,N,E}, R-Car Gen4, R-Car Gen3 and even SH7751 SoCs, it's clear that this is the way to clear errors for all of these SoCs.
While we're here, annotate the handle_error() function with a couple of comments as the reads and writes themselves don't immediately make it clear what we're doing.
Signed-off-by: Paul Barker paul.barker.ct@bp.renesas.com
I've verified that the problem exists on the RZ/G2M hihope-rzg2m board, and that this patch fixes it.
Tested-by: Chris Paterson chris.paterson2@renesas.com
Kind regards, Chris