linux-kernel - [PATCH AUTOSEL 6.6 42/75] i2c: designware: Fix RX FIFO depth define on Wangxun 10Gb NIC

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Date: Fri, 29 Mar 2024 08:42:23 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	Jiawen Wu <jiawenwu@...stnetic.com>,
	Andi Shyti <andi.shyti@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	linux-i2c@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 42/75] i2c: designware: Fix RX FIFO depth define on Wangxun 10Gb NIC

From: Jarkko Nikula <jarkko.nikula@...ux.intel.com>

[ Upstream commit c94612a72ac87b0337a0d85b9263266776ed4190 ]

I believe RX FIFO depth define 0 is incorrect on Wangxun 10Gb NIC. It
must be at least 1 since code is able to read received data from the
DW_IC_DATA_CMD register.

For now this define is irrelevant since the txgbe_i2c_dw_xfer_quirk()
doesn't use the rx_fifo_depth member variable of struct dw_i2c_dev but
is needed when converting code into generic polling mode implementation.

Signed-off-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
Tested-by: Jiawen Wu <jiawenwu@...stnetic.com>
Signed-off-by: Andi Shyti <andi.shyti@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/i2c/busses/i2c-designware-core.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index a7f6f3eafad7d..ae835000fd32a 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -318,7 +318,7 @@ struct dw_i2c_dev {
 #define AMD_UCSI_INTR_EN			0xd
 
 #define TXGBE_TX_FIFO_DEPTH			4
-#define TXGBE_RX_FIFO_DEPTH			0
+#define TXGBE_RX_FIFO_DEPTH			1
 
 struct i2c_dw_semaphore_callbacks {
 	int	(*probe)(struct dw_i2c_dev *dev);
-- 
2.43.0