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authorRajendra Nayak <rnayak@codeaurora.org>2020-07-03 15:11:31 +0530
committerBjorn Andersson <bjorn.andersson@linaro.org>2020-07-13 16:15:53 -0700
commitf79a158d37c26015099f4a7fd7d6592bb2ad3054 (patch)
tree52400c98c8a045019532f9fb3c49a1f4c5db248b /drivers/spi/spi-qcom-qspi.c
parent4bdc8c8d2815fe8ef5052c5a5ab51c04a4f0de7b (diff)
downloadlinux-f79a158d37c26015099f4a7fd7d6592bb2ad3054.tar.bz2
spi: spi-qcom-qspi: Use OPP API to set clk/perf state
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>
Diffstat (limited to 'drivers/spi/spi-qcom-qspi.c')
-rw-r--r--drivers/spi/spi-qcom-qspi.c28
1 files changed, 27 insertions, 1 deletions
diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c
index b5b4cf6ad514..18a59aa23ef8 100644
--- a/drivers/spi/spi-qcom-qspi.c
+++ b/drivers/spi/spi-qcom-qspi.c
@@ -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);