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[Qemu-devel] [PATCH v2 0/4] ARM pl011 fixes

From: Rob Herring
Subject: [Qemu-devel] [PATCH v2 0/4] ARM pl011 fixes
Date: Fri, 14 Mar 2014 13:22:27 -0500

From: Rob Herring <address@hidden>

Intermittent issues have been seen where no serial input occurs. It
appears the pl011 gets in a state where the rx interrupt never fires
because the rx interrupt only asserts when crossing the fifo trigger
level. The fifo state appears to get out of sync when the pl011 is
re-configured. This combined with the rx timeout interrupt not being
modeled results in no more rx interrupts.

This problem is fixed by the 1st patch. The 3 other patches are problems
I noticed while debugging this issue. They are more for correctness of
the model than fixing any observed issues.


Rob Herring (4):
  pl011: reset the fifo when enabled or disabled
  pl011: fix UARTRSR accesses corrupting the UARTCR value
  pl011: fix incorrect logic to set the RXFF flag
  pl011: re-evaluate rx interrupt when fifo trigger changes

 hw/char/pl011.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)


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