[net-next,1/6] net: ipa: reverse logic on escape buffer use
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Message ID 20201125204522.5884-2-elder@linaro.org
State New, archived
Headers show
  • net: ipa: start adding IPA v4.5 support
Related show

Commit Message

Alex Elder Nov. 25, 2020, 8:45 p.m. UTC
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 <elder@linaro.org>
 drivers/net/ipa/gsi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

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diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index eb4c5d408a835..2cf10c9f0143d 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)
 	iowrite32(val, gsi->virt + GSI_CH_C_QOS_OFFSET(channel_id));