diff options
| author | Zhichao Liu <zhichao.liu@mediatek.com> | 2022-11-10 15:28:39 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2022-11-10 10:25:12 +0000 |
| commit | 0d10e90cee9eb57882b0f7e19fd699033722e226 (patch) | |
| tree | 01b33e7be5ed76d57a0b47ee1b568eec2efbf46d | |
| parent | bff6bef701db784bb159a659e99c785b4594fc96 (diff) | |
spi: mediatek: Fix DEVAPC Violation at KO Remove
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@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20221110072839.30961-1-zhichao.liu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | drivers/spi/spi-mt65xx.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c index a33c9a3de395..d6aff909fc36 100644 --- a/drivers/spi/spi-mt65xx.c +++ b/drivers/spi/spi-mt65xx.c @@ -1273,8 +1273,11 @@ 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); @@ -1283,6 +1286,9 @@ static int mtk_spi_remove(struct platform_device *pdev) clk_unprepare(mdata->spi_hclk); } + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); + return 0; } |