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Message-ID: <20230818103750.516309-3-d-gole@ti.com>
Date: Fri, 18 Aug 2023 16:07:50 +0530
From: Dhruva Gole <d-gole@...com>
To: Mark Brown <broonie@...nel.org>, Nishanth Menon <nm@...com>,
Vignesh Raghavendra <vigneshr@...com>,
Tero Kristo <kristo@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-spi@...r.kernel.org>, Dhruva Gole <d-gole@...com>,
Apurva Nandan <a-nandan@...com>,
Ramuthevar Vadivel Murugan
<vadivel.muruganx.ramuthevar@...ux.intel.com>,
Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>,
Ian Abbott <abbotti@....co.uk>,
William Qiu <william.qiu@...rfivetech.com>,
Brad Larson <blarson@....com>,
Pratyush Yadav <ptyadav@...zon.de>
Subject: [RFT/PATCH 2/2] spi: spi-cadence-quadspi: add runtime pm support
Add runtime pm support to cadence-qspi driver, this allows the driver to
suspend whenever it's is not actively being used thus reducing active
power consumed by the system.
Also, with the use of devm_pm_runtime_enable we no longer need the
fallback probe_pm_failed that used to pm_runtime_disable
Co-developed-by: Apurva Nandan <a-nandan@...com>
Signed-off-by: Apurva Nandan <a-nandan@...com>
Signed-off-by: Dhruva Gole <d-gole@...com>
---
Cc: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
Cc: Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
Cc: Ian Abbott <abbotti@....co.uk>
Cc: William Qiu <william.qiu@...rfivetech.com>
Cc: Brad Larson <blarson@....com>
Cc: Pratyush Yadav <ptyadav@...zon.de>
drivers/spi/spi-cadence-quadspi.c | 38 +++++++++++++++++++++++--------
1 file changed, 29 insertions(+), 9 deletions(-)
diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index b50db71ac4cc..8b6c2822037e 100644
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -116,6 +116,9 @@ struct cqspi_driver_platdata {
#define CQSPI_TIMEOUT_MS 500
#define CQSPI_READ_TIMEOUT_MS 10
+/* Runtime_pm autosuspend delay */
+#define CQSPI_AUTOSUSPEND_TIMEOUT 2000
+
#define CQSPI_DUMMY_CLKS_PER_BYTE 8
#define CQSPI_DUMMY_BYTES_MAX 4
#define CQSPI_DUMMY_CLKS_MAX 31
@@ -1407,8 +1410,16 @@ static int cqspi_mem_process(struct spi_mem *mem, const struct spi_mem_op *op)
static int cqspi_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
{
int ret;
+ struct cqspi_st *cqspi = spi_master_get_devdata(mem->spi->master);
+ struct device *dev = &cqspi->pdev->dev;
+
+ pm_runtime_resume_and_get(dev);
ret = cqspi_mem_process(mem, op);
+
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
+
if (ret)
dev_err(&mem->spi->dev, "operation failed with %d\n", ret);
@@ -1753,10 +1764,10 @@ static int cqspi_probe(struct platform_device *pdev)
if (irq < 0)
return -ENXIO;
- pm_runtime_enable(dev);
- ret = pm_runtime_resume_and_get(dev);
- if (ret < 0)
- goto probe_pm_failed;
+ ret = pm_runtime_set_active(dev);
+ if (ret)
+ return ret;
+
ret = clk_prepare_enable(cqspi->clk);
if (ret) {
@@ -1862,21 +1873,29 @@ static int cqspi_probe(struct platform_device *pdev)
goto probe_setup_failed;
}
+ ret = devm_pm_runtime_enable(dev);
+ if (ret)
+ return ret;
+
+ pm_runtime_set_autosuspend_delay(dev, CQSPI_AUTOSUSPEND_TIMEOUT);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_get_noresume(dev);
+
ret = spi_register_controller(host);
if (ret) {
dev_err(&pdev->dev, "failed to register SPI ctlr %d\n", ret);
goto probe_setup_failed;
}
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
+
return 0;
probe_setup_failed:
cqspi_controller_enable(cqspi, 0);
probe_reset_failed:
clk_disable_unprepare(cqspi->clk);
probe_clk_failed:
- pm_runtime_put_sync(dev);
-probe_pm_failed:
- pm_runtime_disable(dev);
return ret;
}
@@ -1928,7 +1947,8 @@ static int cqspi_resume(struct device *dev)
return spi_controller_resume(host);
}
-static DEFINE_SIMPLE_DEV_PM_OPS(cqspi_dev_pm_ops, cqspi_suspend, cqspi_resume);
+static DEFINE_RUNTIME_DEV_PM_OPS(cqspi_dev_pm_ops, cqspi_suspend,
+ cqspi_resume, NULL);
static const struct cqspi_driver_platdata cdns_qspi = {
.quirks = CQSPI_DISABLE_DAC_MODE,
@@ -2012,7 +2032,7 @@ static struct platform_driver cqspi_platform_driver = {
.remove_new = cqspi_remove,
.driver = {
.name = CQSPI_NAME,
- .pm = &cqspi_dev_pm_ops,
+ .pm = pm_ptr(&cqspi_dev_pm_ops),
.of_match_table = cqspi_dt_ids,
},
};
--
2.34.1
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