From: Alex Elder <elder@linaro.org>
To: davem@davemloft.net, kuba@kernel.org
Cc: pkurapat@codeaurora.org, avuyyuru@codeaurora.org,
bjorn.andersson@linaro.org, cpratapa@codeaurora.org,
subashab@codeaurora.org, evgreen@chromium.org, elder@kernel.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH net 1/2] net: ipa: HOLB register sometimes must be written twice
Date: Fri, 12 Nov 2021 16:22:09 -0600 [thread overview]
Message-ID: <20211112222210.224057-2-elder@linaro.org> (raw)
In-Reply-To: <20211112222210.224057-1-elder@linaro.org>
Starting with IPA v4.5, the HOL_BLOCK_EN register must be written
twice when enabling head-of-line blocking avoidance.
Fixes: 84f9bd12d46db ("soc: qcom: ipa: IPA endpoints")
Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/net/ipa/ipa_endpoint.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 5528d97110d56..006da4642a0ba 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -868,6 +868,9 @@ ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint, bool enable)
val = enable ? HOL_BLOCK_EN_FMASK : 0;
offset = IPA_REG_ENDP_INIT_HOL_BLOCK_EN_N_OFFSET(endpoint_id);
iowrite32(val, endpoint->ipa->reg_virt + offset);
+ /* When enabling, the register must be written twice for IPA v4.5+ */
+ if (enable && endpoint->ipa->version >= IPA_VERSION_4_5)
+ iowrite32(val, endpoint->ipa->reg_virt + offset);
}
void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa)
--
2.32.0
next prev parent reply other threads:[~2021-11-12 22:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-12 22:22 [PATCH net 0/2] net: ipa: HOLB register write fixes Alex Elder
2021-11-12 22:22 ` Alex Elder [this message]
2021-11-12 22:22 ` [PATCH net 2/2] net: ipa: disable HOLB drop when updating timer Alex Elder
2021-11-15 13:30 ` [PATCH net 0/2] net: ipa: HOLB register write fixes patchwork-bot+netdevbpf
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