linux-kernel - [PATCH 2/7] spi: spi-ep93xx: Prepare clock before using it

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Message-Id: <20210613233041.128961-3-alexander.sverdlin@gmail.com>
Date:   Mon, 14 Jun 2021 01:30:36 +0200
From:   Alexander Sverdlin <alexander.sverdlin@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Nikita Shubin <nikita.shubin@...uefel.me>,
        linux-spi@...r.kernel.org
Cc:     Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH 2/7] spi: spi-ep93xx: Prepare clock before using it

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
CPU: 0 PID: 1 Comm: swapper Tainted: G        W         5.13.0-rc5-... #1
Hardware name: Cirrus Logic EDB9302 Evaluation Board
[<c000d5b0>] (unwind_backtrace) from [<c000c590>] (show_stack+0x10/0x18)
[<c000c590>] (show_stack) from [<c03a5f38>] (dump_stack+0x20/0x2c)
[<c03a5f38>] (dump_stack) from [<c03a2098>] (__warn+0x98/0xc0)
[<c03a2098>] (__warn) from [<c03a2150>] (warn_slowpath_fmt+0x90/0xc0)
[<c03a2150>] (warn_slowpath_fmt) from [<c01d8358>] (clk_core_enable+0x9c/0xbc)
[<c01d8358>] (clk_core_enable) from [<c01d8698>] (clk_core_enable_lock+0x18/0x30)
[<c01d8698>] (clk_core_enable_lock) from [<c023eeb4>] (ep93xx_spi_prepare_hardware+0x10/0x30)
[<c023eeb4>] (ep93xx_spi_prepare_hardware) from [<c023c0f8>] (__spi_pump_messages+0x124/0x620)
[<c023c0f8>] (__spi_pump_messages) from [<c023e5b8>] (__spi_sync+0x280/0x2c0)
[<c023e5b8>] (__spi_sync) from [<c023e61c>] (spi_sync+0x24/0x40)
[<c023e61c>] (spi_sync) from [<c021f8a4>] (spi_sync_transfer.constprop.0+0x64/0x8c)
[<c021f8a4>] (spi_sync_transfer.constprop.0) from [<c021f914>] (regmap_spi_write+0x48/0x70)
[<c021f914>] (regmap_spi_write) from [<c021c320>] (_regmap_raw_write_impl+0x640/0x740)
[<c021c320>] (_regmap_raw_write_impl) from [<c021c49c>] (_regmap_bus_raw_write+0x7c/0xac)
[<c021c49c>] (_regmap_bus_raw_write) from [<c021bbd4>] (_regmap_update_bits+0xec/0xf8)
[<c021bbd4>] (_regmap_update_bits) from [<c021dac4>] (regmap_update_bits_base+0x50/0x7c)
[<c021dac4>] (regmap_update_bits_base) from [<c0290ea8>] (cs4271_component_probe+0x74/0x148)
[<c0290ea8>] (cs4271_component_probe) from [<c02889b4>] (snd_soc_component_probe+0x24/0x74)
[<c02889b4>] (snd_soc_component_probe) from [<c027e9d0>] (soc_probe_component+0x11c/0x29c)
[<c027e9d0>] (soc_probe_component) from [<c027ef14>] (snd_soc_bind_card+0x3c4/0x8a8)
[<c027ef14>] (snd_soc_bind_card) from [<c0291798>] (edb93xx_probe+0x34/0x5c)
[<c0291798>] (edb93xx_probe) from [<c02126e0>] (platform_probe+0x34/0x80)
[<c02126e0>] (platform_probe) from [<c0210bf8>] (really_probe+0xe8/0x394)
[<c0210bf8>] (really_probe) from [<c0211464>] (device_driver_attach+0x5c/0x64)
[<c0211464>] (device_driver_attach) from [<c02114e8>] (__driver_attach+0x7c/0xec)
[<c02114e8>] (__driver_attach) from [<c020f1b4>] (bus_for_each_dev+0x78/0xc4)
[<c020f1b4>] (bus_for_each_dev) from [<c0211570>] (driver_attach+0x18/0x24)
[<c0211570>] (driver_attach) from [<c020fab4>] (bus_add_driver+0x140/0x1cc)
[<c020fab4>] (bus_add_driver) from [<c0211c44>] (driver_register+0x74/0x114)
[<c0211c44>] (driver_register) from [<c02134f8>] (__platform_driver_register+0x18/0x24)
[<c02134f8>] (__platform_driver_register) from [<c047084c>] (edb93xx_driver_init+0x10/0x1c)
[<c047084c>] (edb93xx_driver_init) from [<c045ce88>] (do_one_initcall+0x7c/0x1a4)
[<c045ce88>] (do_one_initcall) from [<c045d184>] (kernel_init_freeable+0x17c/0x1fc)
[<c045d184>] (kernel_init_freeable) from [<c03a64d0>] (kernel_init+0x8/0xf8)
[<c03a64d0>] (kernel_init) from [<c00082d8>] (ret_from_fork+0x14/0x3c)
...
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;
 }
-- 
2.32.0