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由 Stefan Agner 提交于
When using DMA framing error get cleared properly. However, due to the additional read from the data register, an underflow in the receive FIFO buffer occurs (the FIFO pointer gets out of sync). Clear the FIFO in case an underflow has occurred. Also disable the receiver during this operation and when reading the data register to minimize potential interference. Signed-off-by: NStefan Agner <stefan.agner@toradex.com> Acked-by: NMax Krummenacher <max.krummenacher@toradex.com> Signed-off-by: NAndrey Smirnov <andrew.smirnov@gmail.com> Cc: Stefan Agner <stefan@agner.ch> Cc: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com> Cc: Chris Healy <cphealy@gmail.com> Cc: Cory Tusar <cory.tusar@zii.aero> Cc: Lucas Stach <l.stach@pengutronix.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <jslaby@suse.com> Cc: linux-imx@nxp.com Cc: linux-serial@vger.kernel.org Cc: linux-kernel@vger.kernel.org Link: https://lore.kernel.org/r/20190729195226.8862-2-andrew.smirnov@gmail.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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