netdev - [PATCH net-next 1/5] net: ipa: head-of-line block registers are RX only

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Date:   Mon, 29 Jun 2020 16:49:15 -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 1/5] net: ipa: head-of-line block registers are RX only

The INIT_HOL_BLOCK_EN and INIT_HOL_BLOCK_TIMER endpoint registers
are only valid for RX endpoints.

Have ipa_endpoint_modem_hol_block_clear_all() skip writing these
registers for TX endpoints.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_endpoint.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 9f50d0d11704..3f5a41fc1997 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -642,6 +642,8 @@ static int ipa_endpoint_init_hol_block_timer(struct ipa_endpoint *endpoint,
 	u32 offset;
 	u32 val;
 
+	/* assert(!endpoint->toward_ipa); */
+
 	/* XXX We'll fix this when the register definition is clear */
 	if (microseconds) {
 		struct device *dev = &ipa->pdev->dev;
@@ -671,6 +673,8 @@ ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint, bool enable)
 	u32 offset;
 	u32 val;
 
+	/* assert(!endpoint->toward_ipa); */
+
 	val = u32_encode_bits(enable ? 1 : 0, HOL_BLOCK_EN_FMASK);
 	offset = IPA_REG_ENDP_INIT_HOL_BLOCK_EN_N_OFFSET(endpoint_id);
 	iowrite32(val, endpoint->ipa->reg_virt + offset);
@@ -683,7 +687,7 @@ void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa)
 	for (i = 0; i < IPA_ENDPOINT_MAX; i++) {
 		struct ipa_endpoint *endpoint = &ipa->endpoint[i];
 
-		if (endpoint->ee_id != GSI_EE_MODEM)
+		if (endpoint->toward_ipa || endpoint->ee_id != GSI_EE_MODEM)
 			continue;
 
 		(void)ipa_endpoint_init_hol_block_timer(endpoint, 0);
-- 
2.25.1