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@xxxxxxxx>
---
drivers/dma/imx-sdma.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 5f3c1378b90e..99d9f431ae2c 100644
--- 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_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 */
--
2.17.1
