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

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geni spi needs to express a perforamnce state requirement on CX
depending on the frequency of the clock rates. Use OPP table from
DT to register with OPP framework and use dev_pm_opp_set_rate() to
set the clk/perf state.

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/1592222564-13556-3-git-send-email-rnayak@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Rajendra Nayak 2020-06-15 17:32:40 +05:30 committed by Bjorn Andersson
parent a5819b548a
commit 1a9e489e61
1 changed files with 23 additions and 3 deletions
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26
drivers/spi/spi-geni-qcom.c
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@ -7,6 +7,7 @@
#include <linux/log2.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/pm_runtime.h>
#include <linux/qcom-geni-se.h>
#include <linux/spi/spi.h>
@ -95,7 +96,6 @@ static int get_spi_clk_cfg(unsigned int speed_hz,
{
unsigned long sclk_freq;
unsigned int actual_hz;
struct geni_se *se = &mas->se;
int ret;
ret = geni_se_clk_freq_match(&mas->se,
@ -112,9 +112,9 @@ static int get_spi_clk_cfg(unsigned int speed_hz,
dev_dbg(mas->dev, "req %u=>%u sclk %lu, idx %d, div %d\n", speed_hz,
actual_hz, sclk_freq, *clk_idx, *clk_div);
ret = clk_set_rate(se->clk, sclk_freq);
ret = dev_pm_opp_set_rate(mas->dev, sclk_freq);
if (ret)
dev_err(mas->dev, "clk_set_rate failed %d\n", ret);
dev_err(mas->dev, "dev_pm_opp_set_rate failed %d\n", ret);
return ret;
}
@ -568,6 +568,17 @@ static int spi_geni_probe(struct platform_device *pdev)
mas->se.wrapper = dev_get_drvdata(dev->parent);
mas->se.base = base;
mas->se.clk = clk;
mas->se.opp_table = dev_pm_opp_set_clkname(&pdev->dev, "se");
if (IS_ERR(mas->se.opp_table))
return PTR_ERR(mas->se.opp_table);
/* OPP table is optional */
ret = dev_pm_opp_of_add_table(&pdev->dev);
if (!ret) {
mas->se.has_opp_table = true;
} else if (ret != -ENODEV) {
dev_err(&pdev->dev, "invalid OPP table in device tree\n");
return ret;
}
spi->bus_num = -1;
spi->dev.of_node = dev->of_node;
@ -614,6 +625,9 @@ spi_geni_probe_free_irq:
spi_geni_probe_runtime_disable:
pm_runtime_disable(dev);
spi_master_put(spi);
if (mas->se.has_opp_table)
dev_pm_opp_of_remove_table(&pdev->dev);
dev_pm_opp_put_clkname(mas->se.opp_table);
return ret;
}
@ -627,6 +641,9 @@ static int spi_geni_remove(struct platform_device *pdev)
free_irq(mas->irq, spi);
pm_runtime_disable(&pdev->dev);
if (mas->se.has_opp_table)
dev_pm_opp_of_remove_table(&pdev->dev);
dev_pm_opp_put_clkname(mas->se.opp_table);
return 0;
}
@ -636,6 +653,9 @@ static int __maybe_unused spi_geni_runtime_suspend(struct device *dev)
struct spi_geni_master *mas = spi_master_get_devdata(spi);
int ret;
/* Drop the performance state vote */
dev_pm_opp_set_rate(dev, 0);
ret = geni_se_resources_off(&mas->se);
if (ret)
return ret;