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Message-Id: <20190715173527.5719-1-digetx@gmail.com>
Date: Mon, 15 Jul 2019 20:35:26 +0300
From: Dmitry Osipenko <digetx@...il.com>
To: Michael Turquette <mturquette@...libre.com>,
Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Peter De Schrijver <pdeschrijver@...dia.com>,
Prashant Gaikwad <pgaikwad@...dia.com>,
Stephen Boyd <sboyd@...nel.org>
Cc: linux-clk@...r.kernel.org, linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/2] clk: tegra: divider: Fix missing check for enable-bit on rate's recalculation
Unset "enable" bit means that divider is in bypass mode, hence it doesn't
have any effect in that case.
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
drivers/clk/tegra/clk-divider.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/tegra/clk-divider.c b/drivers/clk/tegra/clk-divider.c
index e76731fb7d69..f33c19045386 100644
--- a/drivers/clk/tegra/clk-divider.c
+++ b/drivers/clk/tegra/clk-divider.c
@@ -40,8 +40,13 @@ static unsigned long clk_frac_div_recalc_rate(struct clk_hw *hw,
int div, mul;
u64 rate = parent_rate;
- reg = readl_relaxed(divider->reg) >> divider->shift;
- div = reg & div_mask(divider);
+ reg = readl_relaxed(divider->reg);
+
+ if ((divider->flags & TEGRA_DIVIDER_UART) &&
+ !(reg & PERIPH_CLK_UART_DIV_ENB))
+ return rate;
+
+ div = (reg >> divider->shift) & div_mask(divider);
mul = get_mul(divider);
div += mul;
--
2.22.0
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