linux-kernel - [PATCH v8 5/9] clk: tegra: Don't allow zero clock rate for PLLs

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Message-Id: <20210516163041.12818-6-digetx@gmail.com>
Date:   Sun, 16 May 2021 19:30:37 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Rob Herring <robh+dt@...nel.org>, linux-tegra@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: [PATCH v8 5/9] clk: tegra: Don't allow zero clock rate for PLLs

Zero clock rate doesn't make sense for PLLs and tegra-clk driver enters
into infinite loop on trying to calculate PLL parameters for zero rate.
Make code to error out if requested rate is zero.

Originally this trouble was found by Robert Yang while he was trying to
bring up upstream kernel on Samsung Galaxy Tab, which happened due to a
bug in Tegra DRM driver that erroneously sets PLL rate to zero. This
issues came over again recently during of kernel bring up on ASUS TF700T.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/clk/tegra/clk-pll.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
index 823a567f2adc..eaa079c177c3 100644
--- a/drivers/clk/tegra/clk-pll.c
+++ b/drivers/clk/tegra/clk-pll.c
@@ -558,6 +558,9 @@ static int _calc_rate(struct clk_hw *hw, struct tegra_clk_pll_freq_table *cfg,
 	u32 p_div = 0;
 	int ret;
 
+	if (!rate)
+		return -EINVAL;
+
 	switch (parent_rate) {
 	case 12000000:
 	case 26000000:
-- 
2.30.2