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Commit 6a56af62 authored by Bao D. Nguyen's avatar Bao D. Nguyen
Browse files

mmc: core: Use freq table with devfreq 



Register the min/max frequencies with devfreq and use
these to determine if we're trying to step up or down.

Change-Id: Id1f49ad4b0e64967e4a72fb2c86df0a6550e1bec
Signed-off-by: default avatarBao D. Nguyen <nguyenb@codeaurora.org>
parent 0a48238d

drivers/mmc/core/core.c

+21 −3
Original line number Diff line number Diff line
@@ -543,6 +543,7 @@ static int mmc_devfreq_create_freq_table(struct mmc_host *host) 
int mmc_init_clk_scaling(struct mmc_host *host)

{

	int err;

	struct devfreq *devfreq;



	if (!host || !host->card) {

		pr_err("%s: unexpected host/card parameters\n",
@@ -593,22 +594,34 @@ int mmc_init_clk_scaling(struct mmc_host *host) 
		return err;

	}



	dev_pm_opp_add(mmc_classdev(host),

		host->clk_scaling.devfreq_profile.freq_table[0], 0);

	dev_pm_opp_add(mmc_classdev(host),

		host->clk_scaling.devfreq_profile.freq_table[1], 0);



	pr_debug("%s: adding devfreq with: upthreshold=%u downthreshold=%u polling=%u\n",

		mmc_hostname(host),

		host->clk_scaling.ondemand_gov_data.upthreshold,

		host->clk_scaling.ondemand_gov_data.downdifferential,

		host->clk_scaling.devfreq_profile.polling_ms);

	host->clk_scaling.devfreq = devfreq_add_device(



	devfreq = devfreq_add_device(

		mmc_classdev(host),

		&host->clk_scaling.devfreq_profile,

		"simple_ondemand",

		&host->clk_scaling.ondemand_gov_data);

	if (!host->clk_scaling.devfreq) {



	if (IS_ERR(devfreq)) {

		pr_err("%s: unable to register with devfreq\n",

			mmc_hostname(host));

		return -EPERM;

		dev_pm_opp_remove(mmc_classdev(host),

			host->clk_scaling.devfreq_profile.freq_table[0]);

		dev_pm_opp_remove(mmc_classdev(host),

			host->clk_scaling.devfreq_profile.freq_table[1]);

		return PTR_ERR(devfreq);

	}



	host->clk_scaling.devfreq = devfreq;

	pr_debug("%s: clk scaling is enabled for device %s (%pK) with devfreq %pK (clock = %uHz)\n",

		mmc_hostname(host),

		dev_name(mmc_classdev(host)),
@@ -765,6 +778,11 @@ int mmc_exit_clk_scaling(struct mmc_host *host) 
		return err;

	}



	dev_pm_opp_remove(mmc_classdev(host),

		host->clk_scaling.devfreq_profile.freq_table[0]);

	dev_pm_opp_remove(mmc_classdev(host),

		host->clk_scaling.devfreq_profile.freq_table[1]);



	kfree(host->clk_scaling.devfreq_profile.freq_table);



	host->clk_scaling.devfreq = NULL;