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

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

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@somainline.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

