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From:   Jeffrey Hugo <quic_jhugo@quicinc.com>
To:     <mani@kernel.org>
CC:     <linux-kernel@vger.kernel.org>, <dri-devel@lists.freedesktop.org>,
        <mhi@lists.linux.dev>, Jeffrey Hugo <quic_jhugo@quicinc.com>,
        Carl Vanderlip <quic_carlv@quicinc.com>,
        Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
Subject: [PATCH v2 2/2] accel/qaic: Add MHI_QUIRK_SOC_HW_VERSION_UNRELIABLE
Date:   Fri, 19 May 2023 10:39:02 -0600
Message-ID: <20230519163902.4170-3-quic_jhugo@quicinc.com>
In-Reply-To: <20230519163902.4170-1-quic_jhugo@quicinc.com>
References: <20230519163902.4170-1-quic_jhugo@quicinc.com>
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AIC100 does not initialize the SOC_HW_VERSION MHI register as expected.
Some instances of AIC100 are observed to have 0xFFFFFFFF in this register
which makes the controller think that the link is down and return an error
up to MHI. This results in a failed initialization.

Allow these cards to initialize by advertising
MHI_QUIRK_SOC_HW_VERSION_UNRELIABLE in the MHI controller.

Change-Id: I62f31a063abf49e8f22ee2aa630d76babba83c8d
Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Carl Vanderlip <quic_carlv@quicinc.com>
Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
---
 drivers/accel/qaic/mhi_controller.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/accel/qaic/mhi_controller.c b/drivers/accel/qaic/mhi_controller.c
index 5036e58e7235..2c85063d8cc6 100644
--- a/drivers/accel/qaic/mhi_controller.c
+++ b/drivers/accel/qaic/mhi_controller.c
@@ -400,6 +400,7 @@ static struct mhi_controller_config aic100_config = {
 	.event_cfg = aic100_events,
 	.use_bounce_buf = false,
 	.m2_no_db = false,
+	.quirks = MHI_QUIRK_SOC_HW_VERSION_UNRELIABLE,
 };
 
 static int mhi_read_reg(struct mhi_controller *mhi_cntrl, void __iomem *addr, u32 *out)
-- 
2.40.1