linux-kernel - [PATCH net v2 3/4] net: ipa: program upper nibbles of sequencer type

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Date:   Thu, 11 Jun 2020 14:48:32 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     evgreen@...omium.org, subashab@...eaurora.org,
        cpratapa@...eaurora.org, bjorn.andersson@...aro.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net v2 3/4] net: ipa: program upper nibbles of sequencer type

The upper two nibbles of the sequencer type were not used for
SDM845, and were assumed to be 0.  But for SC7180 they are used, and
so they must be programmed by ipa_endpoint_init_seq().  Fix this bug.

IPA_SEQ_PKT_PROCESS_NO_DEC_NO_UCP_DMAP doesn't have a descriptive
comment, so add one.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_endpoint.c | 6 ++++--
 drivers/net/ipa/ipa_reg.h      | 2 ++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 2825dca23ec4..bf3e8ced3ee0 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -699,10 +699,12 @@ static void ipa_endpoint_init_seq(struct ipa_endpoint *endpoint)
 	u32 seq_type = endpoint->seq_type;
 	u32 val = 0;
 
+	/* Sequencer type is made up of four nibbles */
 	val |= u32_encode_bits(seq_type & 0xf, HPS_SEQ_TYPE_FMASK);
 	val |= u32_encode_bits((seq_type >> 4) & 0xf, DPS_SEQ_TYPE_FMASK);
-	/* HPS_REP_SEQ_TYPE is 0 */
-	/* DPS_REP_SEQ_TYPE is 0 */
+	/* The second two apply to replicated packets */
+	val |= u32_encode_bits((seq_type >> 8) & 0xf, HPS_REP_SEQ_TYPE_FMASK);
+	val |= u32_encode_bits((seq_type >> 12) & 0xf, DPS_REP_SEQ_TYPE_FMASK);
 
 	iowrite32(val, endpoint->ipa->reg_virt + offset);
 }
diff --git a/drivers/net/ipa/ipa_reg.h b/drivers/net/ipa/ipa_reg.h
index 3b8106aa277a..0a688d8c1d7c 100644
--- a/drivers/net/ipa/ipa_reg.h
+++ b/drivers/net/ipa/ipa_reg.h
@@ -455,6 +455,8 @@ enum ipa_mode {
  *	second packet processing pass + no decipher + microcontroller
  * @IPA_SEQ_DMA_DEC:		DMA + cipher/decipher
  * @IPA_SEQ_DMA_COMP_DECOMP:	DMA + compression/decompression
+ * @IPA_SEQ_PKT_PROCESS_NO_DEC_NO_UCP_DMAP:
+ *	packet processing + no decipher + no uCP + HPS REP DMA parser
  * @IPA_SEQ_INVALID:		invalid sequencer type
  *
  * The values defined here are broken into 4-bit nibbles that are written
-- 
2.25.1