linux-kernel - [PATCH 1/2] firmware: arm_scmi: Keep the discrete clock rates sorted

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Message-Id: <20200708110725.18017-1-sudeep.holla@arm.com>
Date:   Wed,  8 Jul 2020 12:07:24 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        Stephen Boyd <sboyd@...nel.org>
Cc:     Sudeep Holla <sudeep.holla@....com>, linux-kernel@...r.kernel.org,
        Michael Turquette <mturquette@...libre.com>,
        Dien Pham <dien.pham.ry@...esas.com>
Subject: [PATCH 1/2] firmware: arm_scmi: Keep the discrete clock rates sorted

Instead of relying on the firmware to keep the clock rates sorted, let
us sort the list. This is not essential for clock layer but it helps
to find the min and max rates easily from the list.

Fixes: 5f6c6430e904 ("firmware: arm_scmi: add initial support for clock protocol")
Reported-by: Dien Pham <dien.pham.ry@...esas.com>
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 drivers/firmware/arm_scmi/clock.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

Hi Dien-san,

If you could review/test these patches, I can queue them ASAP.
I am planning to send the PR for ARM SoC later this week, so I need
your tested-by.

Regards,
Sudeep

diff --git a/drivers/firmware/arm_scmi/clock.c b/drivers/firmware/arm_scmi/clock.c
index 4c2227662b26..2dd119cdebf6 100644
--- a/drivers/firmware/arm_scmi/clock.c
+++ b/drivers/firmware/arm_scmi/clock.c
@@ -5,6 +5,8 @@
  * Copyright (C) 2018 ARM Ltd.
  */

+#include <linux/sort.h>
+
 #include "common.h"

 enum scmi_clock_protocol_cmd {
@@ -121,6 +123,13 @@ static int scmi_clock_attributes_get(const struct scmi_handle *handle,
 	return ret;
 }

+static int rate_cmp_func(const void *_r1, const void *_r2)
+{
+	u64 *r1 = _r1, *r2 = _r2;
+
+	return r1 - r2;
+}
+
 static int
 scmi_clock_describe_rates_get(const struct scmi_handle *handle, u32 clk_id,
 			      struct scmi_clock_info *clk)
@@ -184,8 +193,10 @@ scmi_clock_describe_rates_get(const struct scmi_handle *handle, u32 clk_id,
 		 */
 	} while (num_returned && num_remaining);

-	if (rate_discrete)
+	if (rate_discrete) {
 		clk->list.num_rates = tot_rate_cnt;
+		sort(rate, tot_rate_cnt, sizeof(*rate), rate_cmp_func, NULL);
+	}

 	clk->rate_discrete = rate_discrete;

--
2.17.1