[PATCH 7.1 0194/2077] clk: scmi: Fix clock rate rounding

7.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Cristian Marussi <[email protected]>

[ Upstream commit d0c81a38d06d446d341532700b3a4a43d3b00eb1 ]

While the do_div() helper used for rounding expects its divisor argument
to be a 32bits quantity, the currently provided divisor parameter is a
64bit value that, as a consequence, is silently truncated and a possible
source of bugs.

Fix by using the proper div64_ul helper.

Cc: Michael Turquette <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: [email protected]
Fixes: 7a8655e19bdb ("clk: scmi: Fix the rounding of clock rate")
Signed-off-by: Cristian Marussi <[email protected]>
Tested-by: Florian Fainelli <[email protected]>
Tested-by: Geert Uytterhoeven <[email protected]>
Link: https://patch.msgid.link/[email protected]
Reviewed-by: Brian Masney <[email protected]>
Signed-off-by: Sudeep Holla <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
 drivers/clk/clk-scmi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk-scmi.c b/drivers/clk/clk-scmi.c
index 6b286ea6f1218c..b6a12f3bc123c9 100644
--- a/drivers/clk/clk-scmi.c
+++ b/drivers/clk/clk-scmi.c
@@ -10,9 +10,9 @@
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/of.h>
+#include <linux/math64.h>
 #include <linux/module.h>
 #include <linux/scmi_protocol.h>
-#include <asm/div64.h>
 
 #define NOT_ATOMIC	false
 #define ATOMIC		true
@@ -83,7 +83,7 @@ static int scmi_clk_determine_rate(struct clk_hw *hw,
 
 	ftmp = req->rate - fmin;
 	ftmp += clk->info->range.step_size - 1; /* to round up */
-	do_div(ftmp, clk->info->range.step_size);
+	ftmp = div64_ul(ftmp, clk->info->range.step_size);
 
 	req->rate = ftmp * clk->info->range.step_size + fmin;
 
-- 
2.53.0