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Commit f0698a8f authored by Ravit Katzav's avatar Ravit Katzav Committed by Gerrit - the friendly Code Review server
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msm: ipa: disable IPA clock gating from debugfs 



IPA clock gating is enabled by default.
Add the ability to dynamically enable and disable
IPA clock gating from debugfs.

Disable IPA clock gating:
	echo 1 > /sys/kernel/debug/ipa/keep_awake
Enable IPA clock gating:
	echo 0 > /sys/kernel/debug/ipa/keep_awake

Change-Id: I4ebe146d2d4c918674fbf70cbddbe6b252e024d7
Acked-by: default avatarAdy Abraham <adya@qti.qualcomm.com>
Signed-off-by: default avatarRavit Katzav <rkatzav@codeaurora.org>
parent 8a68fd00

drivers/platform/msm/ipa/ipa_debugfs.c

+57 −0
Original line number Diff line number Diff line
@@ -74,6 +74,7 @@ const char *ipa_hdr_proc_type_name[] = { 
static struct dentry *dent;

static struct dentry *dfile_gen_reg;

static struct dentry *dfile_ep_reg;

static struct dentry *dfile_keep_awake;

static struct dentry *dfile_ep_holb;

static struct dentry *dfile_hdr;

static struct dentry *dfile_proc_ctx;
@@ -368,6 +369,50 @@ static ssize_t ipa_read_ep_reg(struct file *file, char __user *ubuf, 
	return size;

}



static ssize_t ipa_write_keep_awake(struct file *file, const char __user *buf,

	size_t count, loff_t *ppos)

{

	unsigned long missing;

	s8 option = 0;



	if (sizeof(dbg_buff) < count + 1)

		return -EFAULT;



	missing = copy_from_user(dbg_buff, buf, count);

	if (missing)

		return -EFAULT;



	dbg_buff[count] = '\0';

	if (kstrtos8(dbg_buff, 0, &option))

		return -EFAULT;



	if (option == 1)

		ipa_inc_client_enable_clks();

	else if (option == 0)

		ipa_dec_client_disable_clks();

	else

		return -EFAULT;



	return count;

}



static ssize_t ipa_read_keep_awake(struct file *file, char __user *ubuf,

	size_t count, loff_t *ppos)

{

	int nbytes;



	ipa_active_clients_lock();

	if (ipa_ctx->ipa_active_clients.cnt)

		nbytes = scnprintf(dbg_buff, IPA_MAX_MSG_LEN,

				"IPA APPS power state is ON\n");

	else

		nbytes = scnprintf(dbg_buff, IPA_MAX_MSG_LEN,

				"IPA APPS power state is OFF\n");

	ipa_active_clients_unlock();



	return simple_read_from_buffer(ubuf, count, ppos, dbg_buff, nbytes);

}



static ssize_t ipa_read_hdr(struct file *file, char __user *ubuf, size_t count,

		loff_t *ppos)

{
@@ -1422,6 +1467,11 @@ const struct file_operations ipa_ep_reg_ops = { 
	.write = ipa_write_ep_reg,

};



const struct file_operations ipa_keep_awake_ops = {

	.read = ipa_read_keep_awake,

	.write = ipa_write_keep_awake,

};



const struct file_operations ipa_ep_holb_ops = {

	.write = ipa_write_ep_holb,

};
@@ -1509,6 +1559,13 @@ void ipa_debugfs_init(void) 
		goto fail;

	}



	dfile_keep_awake = debugfs_create_file("keep_awake", read_write_mode,

			dent, 0, &ipa_keep_awake_ops);

	if (!dfile_keep_awake || IS_ERR(dfile_keep_awake)) {

		IPAERR("fail to create file for debug_fs dfile_keep_awake\n");

		goto fail;

	}



	dfile_ep_holb = debugfs_create_file("holb", write_only_mode, dent,

			0, &ipa_ep_holb_ops);

	if (!dfile_ep_holb || IS_ERR(dfile_ep_holb)) {