From: Claudiu Beznea <claudiu.beznea@microchip.com>
To: <mturquette@baylibre.com>, <sboyd@kernel.org>,
<nicolas.ferre@microchip.com>, <alexandre.belloni@bootlin.com>,
<ludovic.desroches@microchip.com>, <linux-kernel@vger.kernel.org>
Cc: <mturquette@linaro.org>, <bbrezillon@kernel.org>,
<linux-clk@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
"Claudiu Beznea" <claudiu.beznea@microchip.com>
Subject: [PATCH 2/2] clk: at91: main: do not continue if oscillators already prepared
Date: Thu, 25 Jun 2020 13:09:28 +0300 [thread overview]
Message-ID: <1593079768-9349-2-git-send-email-claudiu.beznea@microchip.com> (raw)
In-Reply-To: <1593079768-9349-1-git-send-email-claudiu.beznea@microchip.com>
Return in clk_main_osc_prepare()/clk_main_rc_osc_prepare() if
oscillators are already enabled.
Fixes: 27cb1c2083373 ("clk: at91: rework main clk implementation")
Fixes: 1bdf02326b71e ("clk: at91: make use of syscon/regmap internally")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
drivers/clk/at91/clk-main.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/clk/at91/clk-main.c b/drivers/clk/at91/clk-main.c
index 37c22667e831..46b4d2131989 100644
--- a/drivers/clk/at91/clk-main.c
+++ b/drivers/clk/at91/clk-main.c
@@ -74,13 +74,11 @@ static int clk_main_osc_prepare(struct clk_hw *hw)
regmap_read(regmap, AT91_CKGR_MOR, &tmp);
tmp &= ~MOR_KEY_MASK;
- if (tmp & AT91_PMC_OSCBYPASS)
+ if (tmp & (AT91_PMC_OSCBYPASS | AT91_PMC_MOSCEN))
return 0;
- if (!(tmp & AT91_PMC_MOSCEN)) {
- tmp |= AT91_PMC_MOSCEN | AT91_PMC_KEY;
- regmap_write(regmap, AT91_CKGR_MOR, tmp);
- }
+ tmp |= AT91_PMC_MOSCEN | AT91_PMC_KEY;
+ regmap_write(regmap, AT91_CKGR_MOR, tmp);
while (!clk_main_osc_ready(regmap))
cpu_relax();
@@ -186,10 +184,12 @@ static int clk_main_rc_osc_prepare(struct clk_hw *hw)
regmap_read(regmap, AT91_CKGR_MOR, &mor);
- if (!(mor & AT91_PMC_MOSCRCEN))
- regmap_update_bits(regmap, AT91_CKGR_MOR,
- MOR_KEY_MASK | AT91_PMC_MOSCRCEN,
- AT91_PMC_MOSCRCEN | AT91_PMC_KEY);
+ if (mor & AT91_PMC_MOSCRCEN)
+ return 0;
+
+ regmap_update_bits(regmap, AT91_CKGR_MOR,
+ MOR_KEY_MASK | AT91_PMC_MOSCRCEN,
+ AT91_PMC_MOSCRCEN | AT91_PMC_KEY);
while (!clk_main_rc_osc_ready(regmap))
cpu_relax();
--
2.7.4
next prev parent reply other threads:[~2020-06-25 10:09 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-25 10:09 [PATCH 1/2] clk: at91: remove the checking of parent_name Claudiu Beznea
2020-06-25 10:09 ` Claudiu Beznea [this message]
2020-06-26 21:03 ` [PATCH 2/2] clk: at91: main: do not continue if oscillators already prepared Alexandre Belloni
2020-07-01 9:47 ` Claudiu.Beznea
2020-06-26 20:58 ` [PATCH 1/2] clk: at91: remove the checking of parent_name Alexandre Belloni
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