linux-kernel - [PATCH V1] i2c: designware: fix wrong tx/rx fifo for ACPI

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Date:   Tue, 29 Nov 2016 10:32:07 +0700
From:   Tin Huynh <tnhuynh@....com>
To:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Wolfram Sang <wsa@...-dreams.de>
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, Loc Ho <lho@....com>,
        Thang Nguyen <tqnguyen@....com>, Phong Vo <pvo@....com>,
        patches@....com, Tin Huynh <tnhuynh@....com>
Subject: [PATCH V1] i2c: designware: fix wrong tx/rx fifo for ACPI

ACPI always sets txfifo and rxfifo to 32. This configuration will
cause problem if the IP core supports a fifo size of 16 bytes only.
Set the default value to 0 so the driver will get these parameters 
from IP core.

Signed-off-by: Tin Huynh <tnhuynh@....com>
---
 drivers/i2c/busses/i2c-designware-platdrv.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 0b42a12..c88a4b8 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -97,8 +97,8 @@ static int dw_i2c_acpi_configure(struct platform_device *pdev)
 	const struct acpi_device_id *id;
 
 	dev->adapter.nr = -1;
-	dev->tx_fifo_depth = 32;
-	dev->rx_fifo_depth = 32;
+	dev->tx_fifo_depth = 0;
+	dev->rx_fifo_depth = 0;
 
 	/*
 	 * Try to get SDA hold time and *CNT values from an ACPI method if
-- 
1.7.1