linux-kernel - [PATCH] i2c: tegra-bpmp: ignore DMA safe buffer flag

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Message-Id: <20210111142713.3641208-1-mperttunen@nvidia.com>
Date:   Mon, 11 Jan 2021 16:27:13 +0200
From:   Mikko Perttunen <mperttunen@...dia.com>
To:     thierry.reding@...il.com, jonathanh@...dia.com
Cc:     talho@...dia.com, linux-i2c@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        Muhammed Fazal <mfazale@...dia.com>, stable@...r.kernel.org,
        Mikko Perttunen <mperttunen@...dia.com>
Subject: [PATCH] i2c: tegra-bpmp: ignore DMA safe buffer flag

From: Muhammed Fazal <mfazale@...dia.com>

Ignore I2C_M_DMA_SAFE flag as it does not make a difference
for bpmp-i2c, but causes -EINVAL to be returned for valid
transactions.

Signed-off-by: Muhammed Fazal <mfazale@...dia.com>
Cc: stable@...r.kernel.org # v4.19+
Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
---
This fixes failures seen with PMIC probing tools on
Tegra186+ boards.

 drivers/i2c/busses/i2c-tegra-bpmp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/i2c/busses/i2c-tegra-bpmp.c b/drivers/i2c/busses/i2c-tegra-bpmp.c
index ec7a7e917edd..998d4b21fb59 100644
--- a/drivers/i2c/busses/i2c-tegra-bpmp.c
+++ b/drivers/i2c/busses/i2c-tegra-bpmp.c
@@ -80,6 +80,9 @@ static int tegra_bpmp_xlate_flags(u16 flags, u16 *out)
 		flags &= ~I2C_M_RECV_LEN;
 	}
 
+	if (flags & I2C_M_DMA_SAFE)
+		flags &= ~I2C_M_DMA_SAFE;
+
 	return (flags != 0) ? -EINVAL : 0;
 }
 
-- 
2.30.0