From 317c2045618cc1f8d38beb8c93a7bdb6ad8638c6 Mon Sep 17 00:00:00 2001
From: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
Date: Tue, 12 Apr 2022 19:57:43 +0800
Subject: [PATCH] spi: spi-mtk-nor: initialize spi controller after resume
Git-commit: 317c2045618cc1f8d38beb8c93a7bdb6ad8638c6
Patch-mainline: v5.18-rc4
References: git-fixes
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@mediatek.com>
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Link: https://lore.kernel.org/r/20220412115743.22641-1-allen-kh.cheng@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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 = {
--
2.31.1