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spi: spi-qcom-qspi: Use OPP API to set clk/perf state

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QSPI needs to vote on a performance state of a power domain depending on
the clock rate. Add support for it by specifying the perf state/clock rate
as an OPP table in device tree.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Acked-by: Mark Brown <broonie@kernel.org>
Cc: Alok Chauhan <alokc@codeaurora.org>
Cc: Akash Asthana <akashast@codeaurora.org>
Cc: linux-spi@vger.kernel.org
Link: https://lore.kernel.org/r/1593769293-6354-2-git-send-email-rnayak@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Rajendra Nayak 2020-07-03 15:11:31 +05:30 committed by Bjorn Andersson
parent 4bdc8c8d28
commit f79a158d37
1 changed files with 27 additions and 1 deletions
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28
drivers/spi/spi-qcom-qspi.c
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@ -9,6 +9,7 @@
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
#include <linux/pm_opp.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi-mem.h>
@ -141,6 +142,8 @@ struct qcom_qspi {
struct clk_bulk_data *clks;
struct qspi_xfer xfer;
struct icc_path *icc_path_cpu_to_qspi;
struct opp_table *opp_table;
bool has_opp_table;
/* Lock to protect data accessed by IRQs */
spinlock_t lock;
};
@ -238,7 +241,7 @@ static int qcom_qspi_transfer_one(struct spi_master *master,
speed_hz = xfer->speed_hz;
/* In regular operation (SBL_EN=1) core must be 4x transfer clock */
ret = clk_set_rate(ctrl->clks[QSPI_CLK_CORE].clk, speed_hz * 4);
ret = dev_pm_opp_set_rate(ctrl->dev, speed_hz * 4);
if (ret) {
dev_err(ctrl->dev, "Failed to set core clk %d\n", ret);
return ret;
@ -519,6 +522,20 @@ static int qcom_qspi_probe(struct platform_device *pdev)
master->handle_err = qcom_qspi_handle_err;
master->auto_runtime_pm = true;
ctrl->opp_table = dev_pm_opp_set_clkname(&pdev->dev, "core");
if (IS_ERR(ctrl->opp_table)) {
ret = PTR_ERR(ctrl->opp_table);
goto exit_probe_master_put;
}
/* OPP table is optional */
ret = dev_pm_opp_of_add_table(&pdev->dev);
if (!ret) {
ctrl->has_opp_table = true;
} else if (ret != -ENODEV) {
dev_err(&pdev->dev, "invalid OPP table in device tree\n");
goto exit_probe_master_put;
}
pm_runtime_enable(dev);
ret = spi_register_master(master);
@ -526,6 +543,9 @@ static int qcom_qspi_probe(struct platform_device *pdev)
return 0;
pm_runtime_disable(dev);
if (ctrl->has_opp_table)
dev_pm_opp_of_remove_table(&pdev->dev);
dev_pm_opp_put_clkname(ctrl->opp_table);
exit_probe_master_put:
spi_master_put(master);
@ -536,11 +556,15 @@ exit_probe_master_put:
static int qcom_qspi_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
struct qcom_qspi *ctrl = spi_master_get_devdata(master);
/* Unregister _before_ disabling pm_runtime() so we stop transfers */
spi_unregister_master(master);
pm_runtime_disable(&pdev->dev);
if (ctrl->has_opp_table)
dev_pm_opp_of_remove_table(&pdev->dev);
dev_pm_opp_put_clkname(ctrl->opp_table);
return 0;
}
@ -551,6 +575,8 @@ static int __maybe_unused qcom_qspi_runtime_suspend(struct device *dev)
struct qcom_qspi *ctrl = spi_master_get_devdata(master);
int ret;
/* Drop the performance state vote */
dev_pm_opp_set_rate(dev, 0);
clk_bulk_disable_unprepare(QSPI_NUM_CLKS, ctrl->clks);
ret = icc_disable(ctrl->icc_path_cpu_to_qspi);