[4.2.y-ckt stable] Patch "i2c: designware: reverts "i2c: designware: Add support for AMD I2C controller"" has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    i2c: designware: reverts "i2c: designware: Add support for AMD I2C controller"

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt2.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From bd03d4a0e062dca4ecfbaa74b5d1aa7c59687f11 Mon Sep 17 00:00:00 2001
From: Ken Xue <Ken.Xue at amd.com>
Date: Fri, 23 Oct 2015 13:28:47 +0800
Subject: i2c: designware: reverts "i2c: designware: Add support for AMD I2C
 controller"

commit 3eddad96c4395280d5f6f13c958b276c11d3f575 upstream.

The patch reverts commit a445900c9060 (i2c: designware: Add support for
AMD I2C controller). It never worked anyhow because it did not register
a proper clkdev.

Since kernel 4.1 starts to support APD, there is no need to get freq
from id->driver_data for AMD0010. clkdev is supposed to be already
registered in APD.

So, revert old design and make AMD0010 looks like other ones.

Signed-off-by: Ken Xue <Ken.Xue at amd.com>
Signed-off-by: Xiangliang Yu <Xiangliang.Yu at amd.com>
Acked-by: Mika Westerberg <mika.westerberg at linux.intel.com>
Signed-off-by: Wolfram Sang <wsa at the-dreams.de>
[ kamal: 4.2-stable prereq for
  2d244c8 i2c: designware: fix IO timeout issue for AMD controller ]
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/i2c/busses/i2c-designware-platdrv.c | 27 +--------------------------
 1 file changed, 1 insertion(+), 26 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 472b882..4bf5fc1 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -97,7 +97,6 @@ static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
 static int dw_i2c_acpi_configure(struct platform_device *pdev)
 {
 	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
-	const struct acpi_device_id *id;

 	dev->adapter.nr = -1;
 	dev->tx_fifo_depth = 32;
@@ -111,29 +110,9 @@ static int dw_i2c_acpi_configure(struct platform_device *pdev)
 	dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
 			   &dev->sda_hold_time);

-	/*
-	 * Provide a way for Designware I2C host controllers that are not
-	 * based on Intel LPSS to specify their input clock frequency via
-	 * id->driver_data.
-	 */
-	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
-	if (id && id->driver_data)
-		clk_register_fixed_rate(&pdev->dev, dev_name(&pdev->dev), NULL,
-					CLK_IS_ROOT, id->driver_data);
-
 	return 0;
 }

-static void dw_i2c_acpi_unconfigure(struct platform_device *pdev)
-{
-	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
-	const struct acpi_device_id *id;
-
-	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
-	if (id && id->driver_data)
-		clk_unregister(dev->clk);
-}
-
 static const struct acpi_device_id dw_i2c_acpi_match[] = {
 	{ "INT33C2", 0 },
 	{ "INT33C3", 0 },
@@ -141,7 +120,7 @@ static const struct acpi_device_id dw_i2c_acpi_match[] = {
 	{ "INT3433", 0 },
 	{ "80860F41", 0 },
 	{ "808622C1", 0 },
-	{ "AMD0010", 133 * 1000 * 1000 },
+	{ "AMD0010", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
@@ -150,7 +129,6 @@ static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
 {
 	return -ENODEV;
 }
-static inline void dw_i2c_acpi_unconfigure(struct platform_device *pdev) { }
 #endif

 static int dw_i2c_probe(struct platform_device *pdev)
@@ -306,9 +284,6 @@ static int dw_i2c_remove(struct platform_device *pdev)
 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);

-	if (has_acpi_companion(&pdev->dev))
-		dw_i2c_acpi_unconfigure(pdev);
-
 	return 0;
 }

--
1.9.1