On Sat, Aug 03, 2013 at 10:09:14AM -0400, Huang Shijie wrote: > From: Huang Shijie <b32955@xxxxxxxxxxxxx> > > The original DMA support works only when RTS/CTS is enabled. > (see the "e800163 serial: mxs-auart: add the DMA support for mx28") > But after several patches, DMA support has lost this limit. > (see the "bcc20f9 serial: mxs-auart: move to use generic DMA helper") > > So an UART without the RTS/CTS lines may also enables the DMA support, > in which case the UART may gets unpredictable results. > > This patch adds an optional property for the UART DT node > which indicates the UART has RTS and CTS lines, and it also means you > enable the DMA support for this UART. > > This patch also adds a macro MXS_AUART_RTSCTS, and uses it to check > RTS/CTS before we enable the DMA for the UART. > > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: Huang Shijie <b32955@xxxxxxxxxxxxx> > Signed-off-by: Huang Shijie <shijie8@xxxxxxxxx> > --- > .../bindings/tty/serial/fsl-mxs-auart.txt | 4 ++++ > drivers/tty/serial/mxs-auart.c | 7 ++++++- > 2 files changed, 10 insertions(+), 1 deletions(-) I don't see how this patch follows the stable kernel guidelines, so I'll take the marking of it off, and queue it up for 3.12. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
