On some SoCs such as i.MX7ULP, there is no busfreq
driver, but cpuidle has some levels which may disable
system/bus clocks, so need to add pm_qos to prevent
cpuidle from entering low level idles and make sure
system/bus clocks are enabled when usdhc is active.
Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx>
Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx>
---
drivers/mmc/host/sdhci-esdhc-imx.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 8dbbc1f62b70..6a02e8b50dc7 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -14,6 +14,7 @@
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/slab.h>
+#include <linux/pm_qos.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sdio.h>
@@ -156,6 +157,8 @@
#define ESDHC_FLAG_HS400_ES BIT(11)
/* The IP has Host Controller Interface for Command Queuing */
#define ESDHC_FLAG_CQHCI BIT(12)
+/* need request pmqos during low power */
+#define ESDHC_FLAG_PMQOS BIT(13)
struct esdhc_soc_data {
u32 flags;
@@ -204,6 +207,12 @@ static const struct esdhc_soc_data usdhc_imx7d_data = {
| ESDHC_FLAG_HS400,
};
+static struct esdhc_soc_data usdhc_imx7ulp_data = {
+ .flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
+ | ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
+ | ESDHC_FLAG_PMQOS,
+};
+
static struct esdhc_soc_data usdhc_imx8qxp_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
@@ -229,6 +238,7 @@ struct pltfm_imx_data {
WAIT_FOR_INT, /* sent CMD12, waiting for response INT */
} multiblock_status;
u32 is_ddr;
+ struct pm_qos_request pm_qos_req;
};
static const struct platform_device_id imx_esdhc_devtype[] = {
@@ -257,6 +267,7 @@ static const struct of_device_id imx_esdhc_dt_ids[] = {
{ .compatible = "fsl,imx6q-usdhc", .data = &usdhc_imx6q_data, },
{ .compatible = "fsl,imx6ull-usdhc", .data = &usdhc_imx6ull_data, },
{ .compatible = "fsl,imx7d-usdhc", .data = &usdhc_imx7d_data, },
+ { .compatible = "fsl,imx7ulp-usdhc", .data = &usdhc_imx7ulp_data, },
{ .compatible = "fsl,imx8qxp-usdhc", .data = &usdhc_imx8qxp_data, },
{ /* sentinel */ }
};
@@ -1436,6 +1447,10 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
imx_data->socdata = of_id ? of_id->data : (struct esdhc_soc_data *)
pdev->id_entry->driver_data;
+ if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
+ pm_qos_add_request(&imx_data->pm_qos_req,
+ PM_QOS_CPU_DMA_LATENCY, 0);
+
imx_data->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(imx_data->clk_ipg)) {
err = PTR_ERR(imx_data->clk_ipg);
@@ -1557,6 +1572,8 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
disable_per_clk:
clk_disable_unprepare(imx_data->clk_per);
free_sdhci:
+ if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
+ pm_qos_remove_request(&imx_data->pm_qos_req);
sdhci_pltfm_free(pdev);
return err;
}
@@ -1578,6 +1595,9 @@ static int sdhci_esdhc_imx_remove(struct platform_device *pdev)
clk_disable_unprepare(imx_data->clk_ipg);
clk_disable_unprepare(imx_data->clk_ahb);
+ if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
+ pm_qos_remove_request(&imx_data->pm_qos_req);
+
sdhci_pltfm_free(pdev);
return 0;
@@ -1649,6 +1669,9 @@ static int sdhci_esdhc_runtime_suspend(struct device *dev)
}
clk_disable_unprepare(imx_data->clk_ahb);
+ if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
+ pm_qos_remove_request(&imx_data->pm_qos_req);
+
return ret;
}
@@ -1659,6 +1682,10 @@ static int sdhci_esdhc_runtime_resume(struct device *dev)
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
int err;
+ if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
+ pm_qos_add_request(&imx_data->pm_qos_req,
+ PM_QOS_CPU_DMA_LATENCY, 0);
+
err = clk_prepare_enable(imx_data->clk_ahb);
if (err)
return err;
--
2.17.1
