linux-kernel - [PATCH net-next 5/6] net: ipa: update sequencer definition constraints

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Message-Id: <20220910011131.1431934-6-elder@linaro.org>
Date:   Fri,  9 Sep 2022 20:11:30 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     mka@...omium.org, evgreen@...omium.org, andersson@...nel.org,
        quic_cpratapa@...cinc.com, quic_avuyyuru@...cinc.com,
        quic_jponduru@...cinc.com, quic_subashab@...cinc.com,
        elder@...nel.org, netdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 5/6] net: ipa: update sequencer definition constraints

Starting with IPA v4.5, replication is done differently from before,
and as a result the "replication" portion of the how the sequencer
is specified must be zero.

Add a check for the configuration data failing that requirement, and
only update the sesquencer type value when it's supported.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_endpoint.c | 16 +++++++++++++---
 drivers/net/ipa/ipa_reg.h      |  1 +
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index eb68ce47698d0..fe0eb882104ee 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -182,6 +182,15 @@ static bool ipa_endpoint_data_valid_one(struct ipa *ipa, u32 count,
 		return true;	/* Nothing more to check for RX */
 	}
 
+	/* Starting with IPA v4.5 sequencer replication is obsolete */
+	if (ipa->version >= IPA_VERSION_4_5) {
+		if (data->endpoint.config.tx.seq_rep_type) {
+			dev_err(dev, "no-zero seq_rep_type TX endpoint %u\n",
+				data->endpoint_id);
+			return false;
+		}
+	}
+
 	if (data->endpoint.config.status_enable) {
 		other_name = data->endpoint.config.tx.status_endpoint;
 		if (other_name >= count) {
@@ -995,9 +1004,10 @@ static void ipa_endpoint_init_seq(struct ipa_endpoint *endpoint)
 	/* Low-order byte configures primary packet processing */
 	val |= u32_encode_bits(endpoint->config.tx.seq_type, SEQ_TYPE_FMASK);
 
-	/* Second byte configures replicated packet processing */
-	val |= u32_encode_bits(endpoint->config.tx.seq_rep_type,
-			       SEQ_REP_TYPE_FMASK);
+	/* Second byte (if supported) configures replicated packet processing */
+	if (endpoint->ipa->version < IPA_VERSION_4_5)
+		val |= u32_encode_bits(endpoint->config.tx.seq_rep_type,
+				       SEQ_REP_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 6f35438cda890..b7b7fb553c445 100644
--- a/drivers/net/ipa/ipa_reg.h
+++ b/drivers/net/ipa/ipa_reg.h
@@ -585,6 +585,7 @@ static inline u32 rsrc_grp_encoded(enum ipa_version version, u32 rsrc_grp)
 #define IPA_REG_ENDP_INIT_SEQ_N_OFFSET(txep) \
 					(0x0000083c + 0x0070 * (txep))
 #define SEQ_TYPE_FMASK				GENMASK(7, 0)
+/* The next field must be zero for IPA v4.5+ */
 #define SEQ_REP_TYPE_FMASK			GENMASK(15, 8)
 
 /**
-- 
2.34.1