[PATCH] spi: spi-mtk-nor: initialize spi controller after resume

[Allen-KH Cheng <allen-kh.cheng@xxxxxxxxxxxx>]

After system resumes, the registers of nor controller are
initialized with default values. The nor controller will
not function properly.

To handle both issues above, we add mtk_nor_init() in
mtk_nor_resume after pm_runtime_force_resume().

Fixes: 3bfd9103c7af ("spi: spi-mtk-nor: Add power management support")

Signed-off-by: Allen-KH Cheng <allen-kh.cheng@xxxxxxxxxxxx>
---
 drivers/spi/spi-mtk-nor.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
index 94fb09696677..d167699a1a96 100644
--- a/drivers/spi/spi-mtk-nor.c
+++ b/drivers/spi/spi-mtk-nor.c
@@ -960,7 +960,17 @@ static int __maybe_unused mtk_nor_suspend(struct device *dev)
 
 static int __maybe_unused mtk_nor_resume(struct device *dev)
 {
-	return pm_runtime_force_resume(dev);
+	struct spi_controller *ctlr = dev_get_drvdata(dev);
+	struct mtk_nor *sp = spi_controller_get_devdata(ctlr);
+	int ret;
+
+	ret = pm_runtime_force_resume(dev);
+	if (ret)
+		return ret;
+
+	mtk_nor_init(sp);
+
+	return 0;
 }
 
 static const struct dev_pm_ops mtk_nor_pm_ops = {
-- 
2.18.0