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Commit b9b9c0c0 authored by Gidon Studinski's avatar Gidon Studinski
Browse files

msm: ipa: teth_bridge: add support for power save 



Add power save support by building dependency graph so that the right
entities will be woken up when needed.

Change-Id: I71bafcb6056a2a19dfab57aabeed3e1e69720349
Signed-off-by: default avatarGidon Studinski <gidons@codeaurora.org>
parent 879cdf53

drivers/platform/msm/ipa/teth_bridge.c

+18 −32
Original line number Diff line number Diff line
@@ -37,35 +37,18 @@ 
#define TETH_ERR(fmt, args...) \

	pr_err(TETH_BRIDGE_DRV_NAME " %s:%d " fmt, __func__, __LINE__, ## args)



/**

 * enum teth_init_status - bridge initialization state

 *			(NOT_INITIALIZED / INITIALIZED/ ERROR)

 */

enum teth_init_status {

	TETH_NOT_INITIALIZED,

	TETH_INITIALIZED,

	TETH_INITIALIZATION_ERROR,

};



/**

 * struct teth_bridge_ctx - Tethering bridge driver context information

 * @class: kernel class pointer

 * @dev_num: kernel device number

 * @dev: kernel device struct pointer

 * @cdev: kernel character device struct

 * finished its resource release procedure

 * @ch_init_cnt: count the initialized channels

 * @init_status: bridge initialization state

 * @init_mutex: for the initialization, connect and disconnect synchronization

 */

struct teth_bridge_ctx {

	struct class *class;

	dev_t dev_num;

	struct device *dev;

	struct cdev cdev;

	u16 ch_init_cnt;

	enum teth_init_status init_status;

	struct mutex init_mutex;

};

static struct teth_bridge_ctx *teth_ctx;
@@ -100,25 +83,26 @@ int teth_bridge_init(struct teth_bridge_init_params *params) 
	params->private_data = NULL;

	params->skip_ep_cfg = true;



	mutex_lock(&teth_ctx->init_mutex);

	if (teth_ctx->init_status == TETH_INITIALIZATION_ERROR) {

		res = -EPERM;

	/* Build dependency graph */

	res = ipa_rm_add_dependency(IPA_RM_RESOURCE_USB_PROD,

				    IPA_RM_RESOURCE_Q6_CONS);

	if (res < 0 && res != -EINPROGRESS) {

		TETH_ERR("ipa_rm_add_dependency() failed.\n");

		goto bail;

	}



	if (teth_ctx->init_status == TETH_INITIALIZED) {

		teth_ctx->ch_init_cnt++;

		res = 0;

	res = ipa_rm_add_dependency(IPA_RM_RESOURCE_Q6_PROD,

				    IPA_RM_RESOURCE_USB_CONS);

	if (res < 0 && res != -EINPROGRESS) {

		ipa_rm_delete_dependency(IPA_RM_RESOURCE_USB_PROD,

					IPA_RM_RESOURCE_Q6_CONS);

		TETH_ERR("ipa_rm_add_dependency() failed.\n");

		goto bail;

	}



	teth_ctx->init_status = TETH_INITIALIZED;

	teth_ctx->ch_init_cnt++;

	res = 0;

	goto bail;



bail:

	mutex_unlock(&teth_ctx->init_mutex);

	TETH_DBG_FUNC_EXIT();

	return res;

}
@@ -129,6 +113,13 @@ EXPORT_SYMBOL(teth_bridge_init); 
*/

int teth_bridge_disconnect(enum ipa_client_type client)

{

	TETH_DBG_FUNC_ENTRY();

	ipa_rm_delete_dependency(IPA_RM_RESOURCE_USB_PROD,

				 IPA_RM_RESOURCE_Q6_CONS);

	ipa_rm_delete_dependency(IPA_RM_RESOURCE_Q6_PROD,

				 IPA_RM_RESOURCE_USB_CONS);

	TETH_DBG_FUNC_EXIT();



	return 0;

}

EXPORT_SYMBOL(teth_bridge_disconnect);
@@ -204,11 +195,6 @@ int teth_bridge_driver_init(void) 
		res = -ENODEV;

		goto fail_cdev_add;

	}



	teth_ctx->ch_init_cnt = 0;

	teth_ctx->init_status = TETH_NOT_INITIALIZED;



	mutex_init(&teth_ctx->init_mutex);

	TETH_DBG("Tethering bridge driver init OK\n");



	return 0;