linux-kernel - [PATCH v1 2/7] net: ipa: endpoint: Don't read unexistant register on IPAv3.1

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Message-Id: <20210211175015.200772-3-angelogioacchino.delregno@somainline.org>
Date:   Thu, 11 Feb 2021 18:50:10 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
To:     elder@...nel.org
Cc:     bjorn.andersson@...aro.org, agross@...nel.org, davem@...emloft.net,
        kuba@...nel.org, linux-arm-msm@...r.kernel.org,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, konrad.dybcio@...ainline.org,
        marijn.suijten@...ainline.org, phone-devel@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
Subject: [PATCH v1 2/7] net: ipa: endpoint: Don't read unexistant register on IPAv3.1

On IPAv3.1 there is no such FLAVOR_0 register so it is impossible
to read tx/rx channel masks and we have to rely on the correctness
on the provided configuration.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
---
 drivers/net/ipa/ipa_endpoint.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 06d8aa34276e..10c477e1bb90 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -1659,6 +1659,15 @@ int ipa_endpoint_config(struct ipa *ipa)
 	u32 max;
 	u32 val;
 
+	/* Some IPA versions don't provide a FLAVOR register and we cannot
+	 * check the rx/tx masks hence we have to rely on the correctness
+	 * of the provided configuration.
+	 */
+	if (ipa->version == IPA_VERSION_3_1) {
+		ipa->available = U32_MAX;
+		return 0;
+	}
+
 	/* Find out about the endpoints supplied by the hardware, and ensure
 	 * the highest one doesn't exceed the number we support.
 	 */
-- 
2.30.0