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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: Angus Ainslie (Purism) <angus@akkea.ca>
Acked-by: Robin Gong <yibin.gong@nxp.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Angus Ainslie (Purism) 2019-03-29 08:21:29 -07:00 committed by Vinod Koul
parent 9e1630b809
commit 941acd566b
1 changed files with 14 additions and 1 deletions
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15
drivers/dma/imx-sdma.c
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@ -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 */