Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 9727198d authored by Ram Prakash Gupta's avatar Ram Prakash Gupta
Browse files

mmc: core: Initialize temperature controlled clock scaling 



Register and deregister for temperature controlled clk scaling
when card is attached and dettached from the device.
This will allow to control the clock frequency based on temperature.

Change-Id: Ie01d573406c273847fb31a5dd64e2b39671e4ac0
Signed-off-by: default avatarRam Prakash Gupta <rampraka@codeaurora.org>
parent 24e44f04

drivers/mmc/core/core.c

+9 −1
Original line number Diff line number Diff line
@@ -285,6 +285,7 @@ static int mmc_devfreq_get_dev_status(struct device *dev, 
{

	struct mmc_host *host = container_of(dev, struct mmc_host, class_dev);

	struct mmc_devfeq_clk_scaling *clk_scaling;

	bool disable = false;



	if (!host) {

		pr_err("bad host parameter\n");
@@ -312,6 +313,13 @@ static int mmc_devfreq_get_dev_status(struct device *dev, 
		}

	}



	if (host->ops->check_temp &&

			host->card->clk_scaling_highest > UHS_DDR50_MAX_DTR)

		disable = host->ops->check_temp(host);

	/* busy_time=0 for running at low freq*/

	if (disable)

		status->busy_time = 0;

	else

		status->busy_time = clk_scaling->total_busy_time_us;

	status->total_time = ktime_to_us(ktime_sub(ktime_get(),

		clk_scaling->measure_interval_start));

drivers/mmc/core/sd.c

+39 −1
Original line number Diff line number Diff line
@@ -33,6 +33,8 @@ 
#define UHS_SDR25_MIN_DTR	(25 * 1000 * 1000)

#define UHS_SDR12_MIN_DTR	(12.5 * 1000 * 1000)



#define ENOCALLBACK 1



static const unsigned int tran_exp[] = {

	10000,		100000,		1000000,	10000000,

	0,		0,		0,		0
@@ -498,6 +500,10 @@ static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 
		err = -EBUSY;

	} else {

		mmc_set_timing(card->host, timing);

		if (card->host->ops->check_temp(card->host) &&

				timing == MMC_TIMING_UHS_SDR104)

			mmc_set_clock(card->host, UHS_SDR50_MAX_DTR);

		else

			mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);

	}
@@ -1122,6 +1128,34 @@ free_card: 
	return err;

}



static int mmc_sd_init_temp_control_clk_scaling(struct mmc_host *host)

{

	int ret;



	if (host->ops->reg_temp_callback) {

		ret = host->ops->reg_temp_callback(host);

	} else {

		pr_err("%s: %s: couldn't find init temp control clk scaling cb\n",

			mmc_hostname(host), __func__);

		ret = -ENOCALLBACK;

	}

	return ret;

}



static int mmc_sd_dereg_temp_control_clk_scaling(struct mmc_host *host)

{

	int ret;



	if (host->ops->dereg_temp_callback) {

		ret = host->ops->dereg_temp_callback(host);

	} else {

		pr_err("%s: %s: couldn't find dereg temp control clk scaling cb\n",

			mmc_hostname(host), __func__);

		ret = -ENOCALLBACK;

	}

	return ret;

}



/*

 * Host is being removed. Free up the current card.

 */
@@ -1131,6 +1165,7 @@ static void mmc_sd_remove(struct mmc_host *host) 
	BUG_ON(!host->card);



	mmc_exit_clk_scaling(host);

	mmc_sd_dereg_temp_control_clk_scaling(host);

	mmc_remove_card(host->card);



	mmc_claim_host(host);
@@ -1458,6 +1493,9 @@ int mmc_attach_sd(struct mmc_host *host) 
		goto err;

	}



	if (mmc_sd_init_temp_control_clk_scaling(host))

		pr_err("%s: failed to init temp control clk scaling\n",

			mmc_hostname(host));

	/*

	 * Detect and init the card.

	 */

include/linux/mmc/host.h

+3 −0
Original line number Diff line number Diff line
@@ -185,6 +185,9 @@ struct mmc_host_ops { 
	int	(*notify_load)(struct mmc_host *, enum mmc_load);

	void	(*notify_halt)(struct mmc_host *mmc, bool halt);

	void	(*force_err_irq)(struct mmc_host *host, u64 errmask);

	int	(*check_temp)(struct mmc_host *host);

	int	(*reg_temp_callback)(struct mmc_host *host);

	int	(*dereg_temp_callback)(struct mmc_host *host);

};



struct mmc_card;