linux-kernel - [PATCH 4.8 016/125] drm/fsl-dcu: fix endian issue when using clk_register

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Message-Id: <20161029134947.894328323@linuxfoundation.org>
Date:   Sat, 29 Oct 2016 09:48:54 -0400
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Meng Yi <meng.yi@....com>,
        Stefan Agner <stefan@...er.ch>
Subject: [PATCH 4.8 016/125] drm/fsl-dcu: fix endian issue when using clk_register_divider

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefan Agner <stefan@...er.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@....com>
Signed-off-by: Stefan Agner <stefan@...er.ch>
Tested-by: Meng Yi <meng.yi@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);