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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
	Heikki Krogerus <heikki.krogerus@linux.intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Sasha Levin <sashal@kernel.org>,
	neil.armstrong@linaro.org,
	robh@kernel.org,
	quic_kriskura@quicinc.com,
	luca.weiss@fairphone.com,
	linux-usb@vger.kernel.org
Subject: [PATCH AUTOSEL 6.9 08/28] usb: typec: ucsi_glink: drop special handling for CCI_BUSY
Date: Wed,  5 Jun 2024 07:48:37 -0400
Message-ID: <20240605114927.2961639-8-sashal@kernel.org>
In-Reply-To: <20240605114927.2961639-1-sashal@kernel.org>
References: <20240605114927.2961639-1-sashal@kernel.org>
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From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

[ Upstream commit 1a395af9d53c6240bf7799abc43b4dc292ca9dd0 ]

Newer Qualcomm platforms (sm8450+) successfully handle busy state and
send the Command Completion after sending the Busy state. Older devices
have firmware bug and can not continue after sending the CCI_BUSY state,
but the command that leads to CCI_BUSY is already forbidden by the
NO_PARTNER_PDOS quirk.

Follow other UCSI glue drivers and drop special handling for CCI_BUSY
event. Let the UCSI core properly handle this state.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20240408-qcom-ucsi-fixes-bis-v1-3-716c145ca4b1@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/typec/ucsi/ucsi_glink.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/typec/ucsi/ucsi_glink.c b/drivers/usb/typec/ucsi/ucsi_glink.c
index 0e6f837f6c31b..1d0e2d87e9b31 100644
--- a/drivers/usb/typec/ucsi/ucsi_glink.c
+++ b/drivers/usb/typec/ucsi/ucsi_glink.c
@@ -176,7 +176,8 @@ static int pmic_glink_ucsi_sync_write(struct ucsi *__ucsi, unsigned int offset,
 	left = wait_for_completion_timeout(&ucsi->sync_ack, 5 * HZ);
 	if (!left) {
 		dev_err(ucsi->dev, "timeout waiting for UCSI sync write response\n");
-		ret = -ETIMEDOUT;
+		/* return 0 here and let core UCSI code handle the CCI_BUSY */
+		ret = 0;
 	} else if (ucsi->sync_val) {
 		dev_err(ucsi->dev, "sync write returned: %d\n", ucsi->sync_val);
 	}
@@ -243,10 +244,7 @@ static void pmic_glink_ucsi_notify(struct work_struct *work)
 		ucsi_connector_change(ucsi->ucsi, con_num);
 	}
 
-	if (ucsi->sync_pending && cci & UCSI_CCI_BUSY) {
-		ucsi->sync_val = -EBUSY;
-		complete(&ucsi->sync_ack);
-	} else if (ucsi->sync_pending &&
+	if (ucsi->sync_pending &&
 		   (cci & (UCSI_CCI_ACK_COMPLETE | UCSI_CCI_COMMAND_COMPLETE))) {
 		complete(&ucsi->sync_ack);
 	}
-- 
2.43.0