From: Amit Daniel Kachhap <amit.kachhap@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Sudeep Holla <sudeep.holla@arm.com>,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@kernel.org>,
linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org,
Amit Daniel Kachhap <amit.kachhap@arm.com>
Subject: [PATCH] clk: scmi: Fix the rounding of clock rate
Date: Tue, 31 Jul 2018 11:25:55 +0530 [thread overview]
Message-ID: <1533016555-3731-1-git-send-email-amit.kachhap@arm.com> (raw)
In-Reply-To: <153296797329.17365.14490424418553594815@swboyd.mtv.corp.google.com>
This fix rounds the clock rate properly by using quotient and not
remainder in the calculation. This issue was found while testing HDMI
in the Juno platform.
Fixes: 6d6a1d82eaef7 ("clk: add support for clocks provided by SCMI")
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
---
drivers/clk/clk-scmi.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/clk/clk-scmi.c b/drivers/clk/clk-scmi.c
index bb2a6f2..a985bf5 100644
--- a/drivers/clk/clk-scmi.c
+++ b/drivers/clk/clk-scmi.c
@@ -38,7 +38,6 @@ static unsigned long scmi_clk_recalc_rate(struct clk_hw *hw,
static long scmi_clk_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
- int step;
u64 fmin, fmax, ftmp;
struct scmi_clk *clk = to_scmi_clk(hw);
@@ -60,9 +59,9 @@ static long scmi_clk_round_rate(struct clk_hw *hw, unsigned long rate,
ftmp = rate - fmin;
ftmp += clk->info->range.step_size - 1; /* to round up */
- step = do_div(ftmp, clk->info->range.step_size);
+ do_div(ftmp, clk->info->range.step_size);
- return step * clk->info->range.step_size + fmin;
+ return ftmp * clk->info->range.step_size + fmin;
}
static int scmi_clk_set_rate(struct clk_hw *hw, unsigned long rate,
--
2.7.4
next prev parent reply other threads:[~2018-07-31 5:56 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-27 14:01 [PATCH] clk: scmi: Fix the rounding of clock rate Amit Daniel Kachhap
2018-07-27 16:37 ` Stephen Boyd
2018-07-30 5:33 ` Amit Daniel Kachhap
2018-07-30 11:40 ` Sudeep Holla
2018-07-30 16:26 ` Stephen Boyd
2018-07-31 5:55 ` Amit Daniel Kachhap [this message]
2018-08-02 20:50 ` Stephen Boyd
2018-07-31 5:21 ` Amit Daniel Kachhap
2018-07-30 11:36 ` Sudeep Holla
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