linux-kernel - [PATCH net-next 1/9] net: ipa: generic command param fix

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Date:   Wed,  8 Feb 2023 14:56:45 -0600
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     caleb.connolly@...aro.org, mka@...omium.org, evgreen@...omium.org,
        andersson@...nel.org, quic_cpratapa@...cinc.com,
        quic_avuyyuru@...cinc.com, quic_jponduru@...cinc.com,
        quic_subashab@...cinc.com, elder@...nel.org,
        netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 1/9] net: ipa: generic command param fix

Starting at IPA v4.11, the GSI_GENERIC_COMMAND GSI register got a
new PARAMS field.  The code that encodes a value into that field
sets it unconditionally, which is wrong.

We currently only provide 0 as the field's value, so this error has
no real effect.  Still, it's a bug, so let's fix it.

Fix an (unrelated) incorrect comment as well.  Fields in the
ERROR_LOG GSI register actually *are* defined for IPA versions
prior to v3.5.1.

Fixes: fe68c43ce388 ("net: ipa: support enhanced channel flow control")
Signed-off-by: Alex Elder <elder@...aro.org>
---
Note:  This is sort of a non-bug, so I submitted it to net-next.

 drivers/net/ipa/gsi.c     | 3 ++-
 drivers/net/ipa/gsi_reg.h | 1 -
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index bea2da1c4c51d..f1a3938294866 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -1666,7 +1666,8 @@ static int gsi_generic_command(struct gsi *gsi, u32 channel_id,
 	val = u32_encode_bits(opcode, GENERIC_OPCODE_FMASK);
 	val |= u32_encode_bits(channel_id, GENERIC_CHID_FMASK);
 	val |= u32_encode_bits(GSI_EE_MODEM, GENERIC_EE_FMASK);
-	val |= u32_encode_bits(params, GENERIC_PARAMS_FMASK);
+	if (gsi->version >= IPA_VERSION_4_11)
+		val |= u32_encode_bits(params, GENERIC_PARAMS_FMASK);
 
 	timeout = !gsi_command(gsi, GSI_GENERIC_CMD_OFFSET, val);
 
diff --git a/drivers/net/ipa/gsi_reg.h b/drivers/net/ipa/gsi_reg.h
index 3763359f208f7..e65f2f055cfff 100644
--- a/drivers/net/ipa/gsi_reg.h
+++ b/drivers/net/ipa/gsi_reg.h
@@ -372,7 +372,6 @@ enum gsi_general_id {
 #define GSI_ERROR_LOG_OFFSET \
 			(0x0001f200 + 0x4000 * GSI_EE_AP)
 
-/* Fields below are present for IPA v3.5.1 and above */
 #define ERR_ARG3_FMASK			GENMASK(3, 0)
 #define ERR_ARG2_FMASK			GENMASK(7, 4)
 #define ERR_ARG1_FMASK			GENMASK(11, 8)
-- 
2.34.1