From: "Rafał Hibner" <rafal.hibner@secom.com.pl>
To: unlisted-recipients:; (no To-header on input)
Cc: "Rafał Hibner" <rafal.hibner@secom.com.pl>,
"Alexandru Ardelean" <alexandru.ardelean@analog.com>,
"Mark Brown" <broonie@kernel.org>,
linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] spi: spi-axi-spi-engine: Access register after clock initialization
Date: Thu, 9 Apr 2020 17:56:21 +0200 [thread overview]
Message-ID: <20200409155621.12174-1-rafal.hibner@secom.com.pl> (raw)
Move register access after clock initialization.
Clock "s_axi_aclk" is needed for register access. Without the clock running
AXI bus hangs and causes kernel freeze.
Cc: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Rafał Hibner <rafal.hibner@secom.com.pl>
---
drivers/spi/spi-axi-spi-engine.c | 32 ++++++++++++++++----------------
1 file changed, 16 insertions(+), 16 deletions(-)
diff --git a/drivers/spi/spi-axi-spi-engine.c b/drivers/spi/spi-axi-spi-engine.c
index eb9b78a90d..af86e6d6e1 100644
--- a/drivers/spi/spi-axi-spi-engine.c
+++ b/drivers/spi/spi-axi-spi-engine.c
@@ -489,22 +489,6 @@ static int spi_engine_probe(struct platform_device *pdev)
spin_lock_init(&spi_engine->lock);
- spi_engine->base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(spi_engine->base)) {
- ret = PTR_ERR(spi_engine->base);
- goto err_put_master;
- }
-
- version = readl(spi_engine->base + SPI_ENGINE_REG_VERSION);
- if (SPI_ENGINE_VERSION_MAJOR(version) != 1) {
- dev_err(&pdev->dev, "Unsupported peripheral version %u.%u.%c\n",
- SPI_ENGINE_VERSION_MAJOR(version),
- SPI_ENGINE_VERSION_MINOR(version),
- SPI_ENGINE_VERSION_PATCH(version));
- ret = -ENODEV;
- goto err_put_master;
- }
-
spi_engine->clk = devm_clk_get(&pdev->dev, "s_axi_aclk");
if (IS_ERR(spi_engine->clk)) {
ret = PTR_ERR(spi_engine->clk);
@@ -525,6 +509,22 @@ static int spi_engine_probe(struct platform_device *pdev)
if (ret)
goto err_clk_disable;
+ spi_engine->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(spi_engine->base)) {
+ ret = PTR_ERR(spi_engine->base);
+ goto err_ref_clk_disable;
+ }
+
+ version = readl(spi_engine->base + SPI_ENGINE_REG_VERSION);
+ if (SPI_ENGINE_VERSION_MAJOR(version) != 1) {
+ dev_err(&pdev->dev, "Unsupported peripheral version %u.%u.%c\n",
+ SPI_ENGINE_VERSION_MAJOR(version),
+ SPI_ENGINE_VERSION_MINOR(version),
+ SPI_ENGINE_VERSION_PATCH(version));
+ ret = -ENODEV;
+ goto err_ref_clk_disable;
+ }
+
writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_RESET);
writel_relaxed(0xff, spi_engine->base + SPI_ENGINE_REG_INT_PENDING);
writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_INT_ENABLE);
--
2.24.1
next reply other threads:[~2020-04-09 16:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-09 15:56 Rafał Hibner [this message]
2020-04-09 17:22 ` [PATCH] spi: spi-axi-spi-engine: Access register after clock initialization Ardelean, Alexandru
[not found] <67f644c1-a0cf-4897-a66a-e2ad4b11140d@secom.com.pl>
2020-04-09 15:26 ` Ardelean, Alexandru
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