[PATCH 4.8 016/125] drm/fsl-dcu: fix endian issue when using clk_register_divider
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2016-10-29 14:18:51
Also in:
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4.8-stable review patch. If anyone has any objections, please let me know.
------------------
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 <redacted>
Signed-off-by: Stefan Agner <stefan@agner.ch>
Tested-by: Meng Yi <redacted>
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);