linux-kernel - [PATCH net-next v2 3/5] net: ipa: mode register is TX only

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Date:   Tue, 30 Jun 2020 08:33:02 -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-next v2 3/5] net: ipa: mode register is TX only

The INIT_MODE endpoint configuration register is only valid for TX
endpoints.  Rather than writing a zero to that register for RX
endpoints, avoid writing the register at all.

Signed-off-by: Alex Elder <elder@...aro.org>
---
v2: The commented calls to assert() that were added are now gone.

 drivers/net/ipa/ipa_endpoint.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 1babcfc79360..566ff6a09e65 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -541,7 +541,7 @@ static void ipa_endpoint_init_mode(struct ipa_endpoint *endpoint)
 	u32 offset = IPA_REG_ENDP_INIT_MODE_N_OFFSET(endpoint->endpoint_id);
 	u32 val;
 
-	if (endpoint->toward_ipa && endpoint->data->dma_mode) {
+	if (endpoint->data->dma_mode) {
 		enum ipa_endpoint_name name = endpoint->data->dma_endpoint;
 		u32 dma_endpoint_id;
 
@@ -552,7 +552,7 @@ static void ipa_endpoint_init_mode(struct ipa_endpoint *endpoint)
 	} else {
 		val = u32_encode_bits(IPA_BASIC, MODE_FMASK);
 	}
-	/* Other bitfields unspecified (and 0) */
+	/* All other bits unspecified (and 0) */
 
 	iowrite32(val, endpoint->ipa->reg_virt + offset);
 }
@@ -1297,6 +1297,7 @@ static void ipa_endpoint_program(struct ipa_endpoint *endpoint)
 		ipa_endpoint_init_aggr(endpoint);
 		ipa_endpoint_init_deaggr(endpoint);
 		ipa_endpoint_init_seq(endpoint);
+		ipa_endpoint_init_mode(endpoint);
 	} else {
 		if (endpoint->ipa->version == IPA_VERSION_3_5_1)
 			(void)ipa_endpoint_program_suspend(endpoint, false);
@@ -1306,7 +1307,6 @@ static void ipa_endpoint_program(struct ipa_endpoint *endpoint)
 	}
 	ipa_endpoint_init_cfg(endpoint);
 	ipa_endpoint_init_hdr(endpoint);
-	ipa_endpoint_init_mode(endpoint);
 	ipa_endpoint_status(endpoint);
 }
 
-- 
2.25.1