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Commit 4f1ac463 authored by Lina Iyer's avatar Lina Iyer
Browse files

drivers: qcom: rpmh: disallow active requests in solver mode 



Controllers may be in 'solver' state, where they could be in autonomous
mode executing low power modes for their hardware and as such are not
available for sending active votes. Device driver may notify RPMH API
that the controller is in solver mode and when in such mode, disallow
requests from platform drivers for state change using the RSC.

Change-Id: I6dccfabdf230d927b945b0bd1840233e69064c9d
Signed-off-by: default avatarLina Iyer <ilina@codeaurora.org>
Signed-off-by: default avatarRaju P.L.S.S.S.N <rplsssn@codeaurora.org>
parent 919176ed

drivers/soc/qcom/rpmh-internal.h

+2 −0
Original line number Diff line number Diff line
@@ -72,12 +72,14 @@ struct rpmh_request { 
 * @cache_lock: synchronize access to the cache data

 * @dirty: was the cache updated since flush

 * @batch_cache: Cache sleep and wake requests sent as batch

 * @in_solver_mode: Controller is busy in solver mode

 */

struct rpmh_ctrlr {

	struct list_head cache;

	spinlock_t cache_lock;

	bool dirty;

	struct list_head batch_cache;

	bool in_solver_mode;

};



/**

drivers/soc/qcom/rpmh.c

+59 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 


#include <linux/atomic.h>

#include <linux/bug.h>

#include <linux/delay.h>

#include <linux/interrupt.h>

#include <linux/jiffies.h>

#include <linux/kernel.h>
@@ -75,6 +76,50 @@ static struct rpmh_ctrlr *get_rpmh_ctrlr(const struct device *dev) 
	return &drv->client;

}



static int check_ctrlr_state(struct rpmh_ctrlr *ctrlr, enum rpmh_state state)

{

	unsigned long flags;

	int ret = 0;



	/* Do not allow setting active votes when in solver mode */

	spin_lock_irqsave(&ctrlr->cache_lock, flags);

	if (ctrlr->in_solver_mode && state == RPMH_ACTIVE_ONLY_STATE)

		ret = -EBUSY;

	spin_unlock_irqrestore(&ctrlr->cache_lock, flags);



	return ret;

}



/**

 * rpmh_mode_solver_set: Indicate that the RSC controller hardware has

 * been configured to be in solver mode

 *

 * @dev: the device making the request

 * @enable: Boolean value indicating if the controller is in solver mode.

 *

 * When solver mode is enabled, passthru API will not be able to send wake

 * votes, just awake and active votes.

 */

int rpmh_mode_solver_set(const struct device *dev, bool enable)

{

	struct rpmh_ctrlr *ctrlr = get_rpmh_ctrlr(dev);

	unsigned long flags;



	for (;;) {

		spin_lock_irqsave(&ctrlr->cache_lock, flags);

		if (rpmh_rsc_ctrlr_is_idle(ctrlr_to_drv(ctrlr))) {

			ctrlr->in_solver_mode = enable;

			spin_unlock_irqrestore(&ctrlr->cache_lock, flags);

			break;

		}

		spin_unlock_irqrestore(&ctrlr->cache_lock, flags);

		udelay(10);

	}



	return 0;

}

EXPORT_SYMBOL(rpmh_mode_solver_set);



void rpmh_tx_done(const struct tcs_request *msg, int r)

{

	struct rpmh_request *rpm_msg = container_of(msg, struct rpmh_request,
@@ -231,8 +276,13 @@ int rpmh_write_async(const struct device *dev, enum rpmh_state state, 
		     const struct tcs_cmd *cmd, u32 n)

{

	struct rpmh_request *rpm_msg;

	struct rpmh_ctrlr *ctrlr = get_rpmh_ctrlr(dev);

	int ret;



	ret = check_ctrlr_state(ctrlr, state);

	if (ret)

		return ret;



	rpm_msg = kzalloc(sizeof(*rpm_msg), GFP_ATOMIC);

	if (!rpm_msg)

		return -ENOMEM;
@@ -263,11 +313,16 @@ int rpmh_write(const struct device *dev, enum rpmh_state state, 
{

	DECLARE_COMPLETION_ONSTACK(compl);

	DEFINE_RPMH_MSG_ONSTACK(dev, state, &compl, rpm_msg);

	struct rpmh_ctrlr *ctrlr = get_rpmh_ctrlr(dev);

	int ret;



	if (!cmd || !n || n > MAX_RPMH_PAYLOAD)

		return -EINVAL;



	ret = check_ctrlr_state(ctrlr, state);

	if (ret)

		return ret;



	memcpy(rpm_msg.cmd, cmd, n * sizeof(*cmd));

	rpm_msg.msg.num_cmds = n;
@@ -357,6 +412,10 @@ int rpmh_write_batch(const struct device *dev, enum rpmh_state state, 
	if (!cmd || !n)

		return -EINVAL;



	ret = check_ctrlr_state(ctrlr, state);

	if (ret)

		return ret;



	while (n[count] > 0)

		count++;

	if (!count)

include/soc/qcom/rpmh.h

+5 −0
Original line number Diff line number Diff line
@@ -26,6 +26,8 @@ int rpmh_invalidate(const struct device *dev); 


int rpmh_ctrlr_idle(const struct device *dev);



int rpmh_mode_solver_set(const struct device *dev, bool enable);



#else



static inline int rpmh_write(const struct device *dev, enum rpmh_state state,
@@ -51,6 +53,9 @@ static inline int rpmh_invalidate(const struct device *dev) 
static inline int rpmh_ctrlr_idle(const struct device *dev)

{ return -ENODEV; }



static inline int rpmh_mode_solver_set(const struct device *dev, bool enable)

{ return -ENODEV; }



#endif /* CONFIG_QCOM_RPMH */



#endif /* __SOC_QCOM_RPMH_H__ */