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Message-Id: <20221128174027.1441921-11-sashal@kernel.org>
Date: Mon, 28 Nov 2022 12:40:11 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Zhichao Liu <zhichao.liu@...iatek.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Mark Brown <broonie@...nel.org>,
Sasha Levin <sashal@...nel.org>, matthias.bgg@...il.com,
linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.15 11/24] spi: mediatek: Fix DEVAPC Violation at KO Remove
From: Zhichao Liu <zhichao.liu@...iatek.com>
[ Upstream commit 0d10e90cee9eb57882b0f7e19fd699033722e226 ]
A DEVAPC violation occurs when removing the module
due to accessing HW registers without base clock.
To fix this bug, the correct method is:
1. Call the runtime resume function to enable the
clock;
2. Operate the registers to reset the HW;
3. Turn off the clocks and disable the device
RPM mechanism.
Signed-off-by: Zhichao Liu <zhichao.liu@...iatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Link: https://lore.kernel.org/r/20221110072839.30961-1-zhichao.liu@mediatek.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/spi/spi-mt65xx.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index 2ca19b01948a..49acba1dea1e 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -912,14 +912,20 @@ static int mtk_spi_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
struct mtk_spi *mdata = spi_master_get_devdata(master);
+ int ret;
- pm_runtime_disable(&pdev->dev);
+ ret = pm_runtime_resume_and_get(&pdev->dev);
+ if (ret < 0)
+ return ret;
mtk_spi_reset(mdata);
if (mdata->dev_comp->no_need_unprepare)
clk_unprepare(mdata->spi_clk);
+ pm_runtime_put_noidle(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
return 0;
}
--
2.35.1
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