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Commit 941acd56 authored by Angus Ainslie (Purism)'s avatar Angus Ainslie (Purism) Committed by Vinod Koul
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dmaengine: imx-sdma: Only check ratio on parts that support 1:1 



On imx8mq B0 chip, AHB/SDMA clock ratio 2:1 can't be supported,
since SDMA clock ratio has to be increased to 250Mhz, AHB can't reach
to 500Mhz, so use 1:1 instead.

To limit this change to the imx8mq for now this patch also adds an
im8mq-sdma compatible string.

Signed-off-by: default avatarAngus Ainslie (Purism) <angus@akkea.ca>
Acked-by: default avatarRobin Gong <yibin.gong@nxp.com>
Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 9e1630b8

drivers/dma/imx-sdma.c

+14 −1
Original line number Diff line number Diff line
@@ -419,6 +419,7 @@ struct sdma_driver_data { 
	int chnenbl0;

	int num_events;

	struct sdma_script_start_addrs	*script_addrs;

	bool check_ratio;

};



struct sdma_engine {
@@ -557,6 +558,13 @@ static struct sdma_driver_data sdma_imx7d = { 
	.script_addrs = &sdma_script_imx7d,

};



static struct sdma_driver_data sdma_imx8mq = {

	.chnenbl0 = SDMA_CHNENBL0_IMX35,

	.num_events = 48,

	.script_addrs = &sdma_script_imx7d,

	.check_ratio = 1,

};



static const struct platform_device_id sdma_devtypes[] = {

	{

		.name = "imx25-sdma",
@@ -579,6 +587,9 @@ static const struct platform_device_id sdma_devtypes[] = { 
	}, {

		.name = "imx7d-sdma",

		.driver_data = (unsigned long)&sdma_imx7d,

	}, {

		.name = "imx8mq-sdma",

		.driver_data = (unsigned long)&sdma_imx8mq,

	}, {

		/* sentinel */

	}
@@ -593,6 +604,7 @@ static const struct of_device_id sdma_dt_ids[] = { 
	{ .compatible = "fsl,imx31-sdma", .data = &sdma_imx31, },

	{ .compatible = "fsl,imx25-sdma", .data = &sdma_imx25, },

	{ .compatible = "fsl,imx7d-sdma", .data = &sdma_imx7d, },

	{ .compatible = "fsl,imx8mq-sdma", .data = &sdma_imx8mq, },

	{ /* sentinel */ }

};

MODULE_DEVICE_TABLE(of, sdma_dt_ids);
@@ -1852,7 +1864,8 @@ static int sdma_init(struct sdma_engine *sdma) 
	if (ret)

		goto disable_clk_ipg;



	if (clk_get_rate(sdma->clk_ahb) == clk_get_rate(sdma->clk_ipg))

	if (sdma->drvdata->check_ratio &&

	    (clk_get_rate(sdma->clk_ahb) == clk_get_rate(sdma->clk_ipg)))

		sdma->clk_ratio = 1;



	/* Be sure SDMA has not started yet */