Patch "drm/fsl-dcu: fix endian issue when using clk_register_divider" has been added to the 4.8-stable tree

Patch "drm/fsl-dcu: fix endian issue when using clk_register_divider" has been added to the 4.8-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/fsl-dcu: fix endian issue when using clk_register_divider

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-fsl-dcu-fix-endian-issue-when-using-clk_register_divider.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 6cc4758ae91c0582f07e3c94c7de1ad0975feff5 Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch>
Date: Fri, 2 Sep 2016 11:23:37 -0700
Subject: drm/fsl-dcu: fix endian issue when using clk_register_divider

From: Stefan Agner <stefan@agner.ch>

commit 6cc4758ae91c0582f07e3c94c7de1ad0975feff5 upstream.

Since using clk_register_divider to setup the pixel clock, regmap
is no longer used. Regmap did take care of DCU using different
endianness. Check endianness using the device-tree property
"big-endian" to determine the location of DIV_RATIO.

Fixes: 2d701449bce1 ("drm/fsl-dcu: use common clock framework for pixel clock divider")
Reported-by: Meng Yi <meng.yi@nxp.com>
Signed-off-by: Stefan Agner <stefan@agner.ch>
Tested-by: Meng Yi <meng.yi@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
@@ -330,6 +330,7 @@ static int fsl_dcu_drm_probe(struct plat
 	const char *pix_clk_in_name;
 	const struct of_device_id *id;
 	int ret;
+	u8 div_ratio_shift = 0;
 
 	fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
 	if (!fsl_dev)
@@ -382,11 +383,14 @@ static int fsl_dcu_drm_probe(struct plat
 		pix_clk_in = fsl_dev->clk;
 	}
 
+	if (of_property_read_bool(dev->of_node, "big-endian"))
+		div_ratio_shift = 24;
+
 	pix_clk_in_name = __clk_get_name(pix_clk_in);
 	snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
 	fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
 			pix_clk_in_name, 0, base + DCU_DIV_RATIO,
-			0, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
+			div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
 	if (IS_ERR(fsl_dev->pix_clk)) {
 		dev_err(dev, "failed to register pix clk\n");
 		ret = PTR_ERR(fsl_dev->pix_clk);


Patches currently in stable-queue which might be from stefan@agner.ch are

queue-4.8/drm-fsl-dcu-fix-endian-issue-when-using-clk_register_divider.patch