[PATCH 5.1 114/122] dmaengine: imx-sdma: Only check ratio on parts that support 1:1

Greg Kroah-Hartman
2019-05-23T19:32:01Z

From: Angus Ainslie (Purism) <angus@akkea.ca>

commit 941acd566b1807b291bbdca31cc5158e26ffcf83 upstream.

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>
Cc: Richard Leitner <richard.leitner@skidata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/dma/imx-sdma.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -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_imx7
.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",
@@ -580,6 +588,9 @@ static const struct platform_device_id s
.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
{ .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
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 */