linux-kernel - [PATCH 2/2] accel/qaic: Add MHI_QUIRK_SOC_HW_VERSION

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Date:   Fri, 14 Apr 2023 13:57:19 -0600
From:   Jeffrey Hugo <quic_jhugo@...cinc.com>
To:     <mani@...nel.org>
CC:     <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <mhi@...ts.linux.dev>, Jeffrey Hugo <quic_jhugo@...cinc.com>
Subject: [PATCH 2/2] accel/qaic: Add MHI_QUIRK_SOC_HW_VERSION_UNRELIABLE

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 advertisting
MHI_QUIRK_SOC_HW_VERSION_UNRELIABLE in the MHI controller.

Signed-off-by: Jeffrey Hugo <quic_jhugo@...cinc.com>
Reviewed-by: Carl Vanderlip <quic_carlv@...cinc.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 5036e58..2c85063 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)
-- 
2.7.4