From 0628467f97b5227755428bac10a68257322f7e34 Mon Sep 17 00:00:00 2001 From: Rajkumar Manoharan Date: Wed, 21 Sep 2016 16:28:06 +0530 Subject: [PATCH] ath10k: fix copy engine 5 destination ring stuck Firmware is running watchdog timer for tracking copy engine ring index and write index. Whenever both indices are stuck at same location for given duration, watchdog will be trigger to assert target. While updating copy engine destination ring write index, driver ensures that write index will not be same as read index by finding delta between these two indices (CE_RING_DELTA). HTT target to host copy engine (CE5) is special case where ring buffers will be reused and delta check is not applied while updating write index. In rare scenario, whenever CE5 ring is full, both indices will be referring same location and this is causing CE ring stuck issue as explained above. This issue is originally reported on IPQ4019 during long hour stress testing and during veriwave max clients testsuites. The same issue is also observed in other chips as well. Fix this by ensuring that write index is one less than read index which means that full ring is available for receiving data. Cc: stable@vger.kernel.org Tested-by: Tamizh chelvam Signed-off-by: Rajkumar Manoharan Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath10k/ce.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/wireless/ath/ath10k/ce.c b/drivers/net/wireless/ath/ath10k/ce.c index e720554..0b4d796 100644 --- a/drivers/net/wireless/ath/ath10k/ce.c +++ b/drivers/net/wireless/ath/ath10k/ce.c @@ -433,6 +433,13 @@ void ath10k_ce_rx_update_write_idx(struct ath10k_ce_pipe *pipe, u32 nentries) unsigned int nentries_mask = dest_ring->nentries_mask; unsigned int write_index = dest_ring->write_index; u32 ctrl_addr = pipe->ctrl_addr; + u32 cur_write_idx = ath10k_ce_dest_ring_write_index_get(ar, ctrl_addr); + + /* Prevent CE ring stuck issue that will occur when ring is full. + * Make sure that write index is 1 less than read index. + */ + if ((cur_write_idx + nentries) == dest_ring->sw_index) + nentries -= 1; write_index = CE_RING_IDX_ADD(nentries_mask, write_index, nentries); ath10k_ce_dest_ring_write_index_set(ar, ctrl_addr, write_index); -- 2.7.4