From 9f848198607f23626deddceb9da9307464031258 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Wed, 25 Nov 2020 14:45:17 -0600 Subject: net: ipa: reverse logic on escape buffer use Starting with IPA v4.2 there is a GSI channel option to use an "escape buffer" instead of prefetch buffers. This should be used for all channels *except* the AP command TX channel. The logic that implements this has it backwards; fix this bug. Signed-off-by: Alex Elder Signed-off-by: Jakub Kicinski --- drivers/net/ipa/gsi.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'drivers/net/ipa') diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c index eb4c5d408a83..2cf10c9f0143 100644 --- a/drivers/net/ipa/gsi.c +++ b/drivers/net/ipa/gsi.c @@ -781,8 +781,10 @@ static void gsi_channel_program(struct gsi_channel *channel, bool doorbell) if (gsi->version == IPA_VERSION_3_5_1 && doorbell) val |= USE_DB_ENG_FMASK; - /* Starting with IPA v4.0 the command channel uses the escape buffer */ - if (gsi->version != IPA_VERSION_3_5_1 && channel->command) + /* v4.0 introduces an escape buffer for prefetch. We use it + * on all but the AP command channel. + */ + if (gsi->version != IPA_VERSION_3_5_1 && !channel->command) val |= USE_ESCAPE_BUF_ONLY_FMASK; iowrite32(val, gsi->virt + GSI_CH_C_QOS_OFFSET(channel_id)); -- cgit v1.2.3