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

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Date:   Mon, 5 Sep 2016 08:46:56 +0000
From:   Meng Yi <meng.yi@....com>
To:     Stefan Agner <stefan@...er.ch>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
CC:     "alison.wang@...escale.com" <alison.wang@...escale.com>,
        "jianwei.wang.chn@...il.com" <jianwei.wang.chn@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH] drm/fsl-dcu: fix endian issue when using
 clk_register_divider


> Subject: [PATCH] drm/fsl-dcu: fix endian issue when using clk_register_divider
> 
> 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.
> 
> Cc: stable@...r.kernel.org
> 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>
> ---
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-
> dcu/fsl_dcu_drm_drv.c
> index 7882387..8dd042e 100644
> --- 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 platform_device
> *pdev)
>  	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 +383,15 @@ static int fsl_dcu_drm_probe(struct platform_device
> *pdev)
>  		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);
> --
> 2.9.0

Tested-by: Meng Yi <meng.yi@....com>
On LS1021A-TWR board.

Meng