mmc: sdhci-msm: Use OPP API to set clk/perf state

On some qualcomm SoCs we need to vote on a performance state of a power
domain depending on the clock rates. Hence move to using OPP api to set
the clock rate and performance state specified in the OPP table.
On platforms without an OPP table, dev_pm_opp_set_rate() is eqvivalent to
clk_set_rate()
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Link: https://lore.kernel.org/r/1587132279-27659-10-git-send-email-rnayak@codeaurora.orgSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-msm.c

@@ -10,6 +10,7 @@
 #include <linux/delay.h>
 #include <linux/mmc/mmc.h>
 #include <linux/pm_runtime.h>
+#include <linux/pm_opp.h>
 #include <linux/slab.h>
 #include <linux/iopoll.h>
 #include <linux/regulator/consumer.h>
@@ -243,6 +244,8 @@ struct sdhci_msm_host {
 	struct clk_bulk_data bulk_clks[4]; /* core, iface, cal, sleep clocks */
 	unsigned long clk_rate;
 	struct mmc_host *mmc;
+	struct opp_table *opp;
+	bool opp_table;
 	bool use_14lpp_dll_reset;
 	bool tuning_done;
 	bool calibration_done;
@@ -332,7 +335,7 @@ static void msm_set_clock_rate_for_bus_mode(struct sdhci_host *host,
 	int rc;
 
 	clock = msm_get_clock_rate_for_bus_mode(host, clock);
-	rc = clk_set_rate(core_clk, clock);
+	rc = dev_pm_opp_set_rate(mmc_dev(host->mmc), clock);
 	if (rc) {
 		pr_err("%s: Failed to set clock at rate %u at timing %d\n",
 		       mmc_hostname(host->mmc), clock,
@@ -1964,8 +1967,18 @@ static int sdhci_msm_probe(struct platform_device *pdev)
 	}
 	msm_host->bulk_clks[0].clk = clk;
 
+	msm_host->opp = dev_pm_opp_set_clkname(&pdev->dev, "core");
+	if (IS_ERR(msm_host->opp)) {
+		ret = PTR_ERR(msm_host->opp);
+		goto bus_clk_disable;
+	}
+
+	/* OPP table is optional */
+	if (!dev_pm_opp_of_add_table(&pdev->dev))
+		msm_host->opp_table = true;
+
 	/* Vote for maximum clock rate for maximum performance */
-	ret = clk_set_rate(clk, INT_MAX);
+	ret = dev_pm_opp_set_rate(&pdev->dev, INT_MAX);
 	if (ret)
 		dev_warn(&pdev->dev, "core clock boost failed\n");
 
@@ -1982,7 +1995,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
 	ret = clk_bulk_prepare_enable(ARRAY_SIZE(msm_host->bulk_clks),
 				      msm_host->bulk_clks);
 	if (ret)
-		goto bus_clk_disable;
+		goto opp_cleanup;
 
 	/*
 	 * xo clock is needed for FLL feature of cm_dll.
@@ -2119,6 +2132,10 @@ static int sdhci_msm_probe(struct platform_device *pdev)
 clk_disable:
 	clk_bulk_disable_unprepare(ARRAY_SIZE(msm_host->bulk_clks),
 				   msm_host->bulk_clks);
+opp_cleanup:
+	if (msm_host->opp_table)
+		dev_pm_opp_of_remove_table(&pdev->dev);
+	dev_pm_opp_put_clkname(msm_host->opp);
 bus_clk_disable:
 	if (!IS_ERR(msm_host->bus_clk))
 		clk_disable_unprepare(msm_host->bus_clk);
@@ -2137,6 +2154,9 @@ static int sdhci_msm_remove(struct platform_device *pdev)
 
 	sdhci_remove_host(host, dead);
 
+	if (msm_host->opp_table)
+		dev_pm_opp_of_remove_table(&pdev->dev);
+	dev_pm_opp_put_clkname(msm_host->opp);
 	pm_runtime_get_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 	pm_runtime_put_noidle(&pdev->dev);
@@ -2155,6 +2175,8 @@ static __maybe_unused int sdhci_msm_runtime_suspend(struct device *dev)
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
 
+	/* Drop the performance vote */
+	dev_pm_opp_set_rate(dev, 0);
 	clk_bulk_disable_unprepare(ARRAY_SIZE(msm_host->bulk_clks),
 				   msm_host->bulk_clks);
 
@@ -2177,9 +2199,11 @@ static __maybe_unused int sdhci_msm_runtime_resume(struct device *dev)
 	 * restore the SDR DLL settings when the clock is ungated.
 	 */
 	if (msm_host->restore_dll_config && msm_host->clk_rate)
-		return sdhci_msm_restore_sdr_dll_config(host);
+		ret = sdhci_msm_restore_sdr_dll_config(host);
 
-	return 0;
+	dev_pm_opp_set_rate(dev, msm_host->clk_rate);
+
+	return ret;
 }
 
 static const struct dev_pm_ops sdhci_msm_pm_ops = {