linux-kernel - [PATCH 2/8] spi: spi-ep93xx: Prepare clock before using it

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Date:   Mon, 26 Jul 2021 14:50:46 +0300
From:   Nikita Shubin <nikita.shubin@...uefel.me>
To:     Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Mark Brown <broonie@...nel.org>,
        linux-spi@...r.kernel.org (open list:SPI SUBSYSTEM),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 2/8] spi: spi-ep93xx: Prepare clock before using it

From: Alexander Sverdlin <alexander.sverdlin@...il.com>

Use clk_prepare_enable()/clk_disable_unprepare() in preparation for switch
to Common Clock Framework, otherwise the following is visible:

WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:1011 clk_core_enable+0x9c/0xbc
Enabling unprepared ep93xx-spi.0
...
Hardware name: Cirrus Logic EDB9302 Evaluation Board
...
clk_core_enable
clk_core_enable_lock
ep93xx_spi_prepare_hardware
__spi_pump_messages
__spi_sync
spi_sync
spi_sync_transfer.constprop.0
regmap_spi_write
_regmap_raw_write_impl
_regmap_bus_raw_write
_regmap_update_bits
regmap_update_bits_base
cs4271_component_probe
snd_soc_component_probe
soc_probe_component
snd_soc_bind_card
edb93xx_probe
...
spi_master spi0: failed to prepare transfer hardware: -108

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
---
 drivers/spi/spi-ep93xx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c
index aa676559d273..5896a7b2fade 100644
--- a/drivers/spi/spi-ep93xx.c
+++ b/drivers/spi/spi-ep93xx.c
@@ -550,7 +550,7 @@ static int ep93xx_spi_prepare_hardware(struct spi_master *master)
 	u32 val;
 	int ret;

-	ret = clk_enable(espi->clk);
+	ret = clk_prepare_enable(espi->clk);
 	if (ret)
 		return ret;

@@ -570,7 +570,7 @@ static int ep93xx_spi_unprepare_hardware(struct spi_master *master)
 	val &= ~SSPCR1_SSE;
 	writel(val, espi->mmio + SSPCR1);

-	clk_disable(espi->clk);
+	clk_disable_unprepare(espi->clk);

 	return 0;
 }
-- 
2.26.2