[PATCH] OPP: debugfs: Use performance level to distinguish between rates

[Manivannan Sadhasivam]

Some OPP tables have entries with same rate and different performance
level. For these entries, using only the rate as the debugfs directory name
causes below error:

debugfs: 'opp:5000000' already exists in 'soc@xxxxxxxxxxxxx'

Fix it by appending the performance level to the dir name.

Reported-by: Bjorn Andersson <andersson@xxxxxxxxxx>
Closes: https://lore.kernel.org/linux-arm-msm/75lzykd37zdvrks5i2bb4zb2yzjtm25kv3hegmikndkbr772mz@w2ykff3ny45u/
Fixes: 05db35963eef ("OPP: Add support to find OPP for a set of keys")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxxxxxxxx>
---
 drivers/opp/debugfs.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/opp/debugfs.c b/drivers/opp/debugfs.c
index 8fc6238b1728..7c912bae2a5a 100644
--- a/drivers/opp/debugfs.c
+++ b/drivers/opp/debugfs.c
@@ -131,21 +131,24 @@ void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
 	struct dentry *pdentry = opp_table->dentry;
 	struct dentry *d;
 	unsigned long id;
-	char name[25];	/* 20 chars for 64 bit value + 5 (opp:\0) */
+	char name[36];	/* "opp:"(4) + u64(20) + "-" (1) + u32(10) + NULL(1) */
 
 	/*
 	 * Get directory name for OPP.
 	 *
-	 * - Normally rate is unique to each OPP, use it to get unique opp-name.
+	 * - Normally rate is unique to each OPP, use it to get unique opp-name,
+	 *   together with performance level.
 	 * - For some devices rate isn't available or there are multiple, use
 	 *   index instead for them.
 	 */
-	if (likely(opp_table->clk_count == 1 && opp->rates[0]))
+	if (likely(opp_table->clk_count == 1 && opp->rates[0])) {
 		id = opp->rates[0];
-	else
+		snprintf(name, sizeof(name), "opp:%lu-%u", id, opp->level);
+	} else {
 		id = _get_opp_count(opp_table);
+		snprintf(name, sizeof(name), "opp:%lu", id);
+	}
 
-	snprintf(name, sizeof(name), "opp:%lu", id);
 
 	/* Create per-opp directory */
 	d = debugfs_create_dir(name, pdentry);
-- 
2.51.0