gsi: Add clock voting before IO access in debugfs

The debugfs functions may be called while the GSI is not clocked.
This will lead to kernel panic due to bus error.
Fixing by clock voting before IO access and unvoting after.

Change-Id: I99b1f69df9be5774d688029886b1aef8dfacc657
Signed-off-by: Ilia Lin <quic_ilial@quicinc.com>

drivers/platform/msm/gsi/gsi_dbg.c

@@ -71,6 +71,8 @@ static ssize_t gsi_dump_evt(struct file *file,
 		return -EINVAL;
 	}
 
+	gsi_ctx->per.vote_clk_cb();
+
 	val = gsihal_read_reg_nk(GSI_EE_n_EV_CH_k_CNTXT_0,
 		gsi_ctx->per.ee, arg1);
 	TERR("EV%2d CTX0  0x%x\n", arg1, val);
@@ -120,6 +122,8 @@ static ssize_t gsi_dump_evt(struct file *file,
 		gsi_ctx->per.ee, arg1);
 	TERR("EV%2d SCR1  0x%x\n", arg1, val);
 
+	gsi_ctx->per.unvote_clk_cb();
+
 	if (arg2) {
 		ctx = &gsi_ctx->evtr[arg1];
 
@@ -183,7 +187,9 @@ static ssize_t gsi_dump_ch(struct file *file,
 		return -EINVAL;
 	}
 
+	gsi_ctx->per.vote_clk_cb();
 	gsi_dump_ch_info(arg1);
+	gsi_ctx->per.unvote_clk_cb();
 
 	if (arg2) {
 		ctx = &gsi_ctx->chan[arg1];
@@ -354,7 +360,6 @@ static ssize_t gsi_set_max_elem_dp_stats(struct file *file,
 	unsigned long missing;
 	char *sptr, *token;
 
-
 	if (count >= sizeof(dbg_buff))
 		goto error;
 
@@ -432,6 +437,8 @@ static void gsi_dbg_update_ch_dp_stats(struct gsi_chan_ctx *ctx)
 	int ee = gsi_ctx->per.ee;
 	uint16_t used_hw;
 
+	gsi_ctx->per.vote_clk_cb();
+
 	rp_hw = gsihal_read_reg_nk(GSI_EE_n_GSI_CH_k_CNTXT_4,
 		ee, ctx->props.ch_id);
 	rp_hw |= ((uint64_t)gsihal_read_reg_nk(GSI_EE_n_GSI_CH_k_CNTXT_5,
@@ -442,6 +449,8 @@ static void gsi_dbg_update_ch_dp_stats(struct gsi_chan_ctx *ctx)
 	wp_hw |= ((uint64_t)gsihal_read_reg_nk(GSI_EE_n_GSI_CH_k_CNTXT_7,
 		ee, ctx->props.ch_id)) << 32;
 
+	gsi_ctx->per.unvote_clk_cb();
+
 	start_hw = gsi_find_idx_from_addr(&ctx->ring, rp_hw);
 	end_hw = gsi_find_idx_from_addr(&ctx->ring, wp_hw);
 
@@ -590,7 +599,7 @@ static ssize_t gsi_read_gsi_hw_profiling_stats(struct file *file,
 	char __user *buf, size_t count, loff_t *ppos)
 {
 	struct gsi_hw_profiling_data stats;
-	int nbytes, cnt = 0;
+	int ret, nbytes, cnt = 0;
 	u64 totalCycles = 0, util = 0;
 
 	if (gsi_ctx->per.ver < GSI_VER_2_9) {
@@ -599,7 +608,12 @@ static ssize_t gsi_read_gsi_hw_profiling_stats(struct file *file,
 		cnt += nbytes;
 		goto done;
 	}
-	if (!gsi_get_hw_profiling_stats(&stats)) {
+
+	gsi_ctx->per.vote_clk_cb();
+	ret = gsi_get_hw_profiling_stats(&stats);
+	gsi_ctx->per.unvote_clk_cb();
+
+	if (!ret) {
 		totalCycles = stats.mcs_busy_cnt + stats.mcs_idle_cnt +
 			stats.bp_and_pending_cnt;
 		if (totalCycles != 0)
@@ -636,7 +650,7 @@ static ssize_t gsi_read_gsi_fw_version(struct file *file,
 	char __user *buf, size_t count, loff_t *ppos)
 {
 	struct gsi_fw_version ver;
-	int nbytes, cnt = 0;
+	int ret, nbytes, cnt = 0;
 
 	if (gsi_ctx->per.ver < GSI_VER_2_9) {
 		nbytes = scnprintf(dbg_buff, GSI_MAX_MSG_LEN,
@@ -644,7 +658,12 @@ static ssize_t gsi_read_gsi_fw_version(struct file *file,
 		cnt += nbytes;
 		goto done;
 	}
-	if (!gsi_get_fw_version(&ver)) {
+
+	gsi_ctx->per.vote_clk_cb();
+	ret = gsi_get_fw_version(&ver);
+	gsi_ctx->per.unvote_clk_cb();
+
+	if (!ret) {
 		nbytes = scnprintf(dbg_buff, GSI_MAX_MSG_LEN,
 			"hw=%d\nflavor=%d\nfw=%d\n",
 			ver.hw,