This is a note to let you know that I've just added the patch titled
mmc: mtk-sd: Clear interrupts when cqe off/disable
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mmc-mtk-sd-clear-interrupts-when-cqe-off-disable.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a262e822c92f2cb8e13f9d10298cd9a76169a9d9
Author: Wenbin Mei <wenbin.mei@xxxxxxxxxxxx>
Date: Thu Jul 28 16:00:48 2022 +0800
mmc: mtk-sd: Clear interrupts when cqe off/disable
[ Upstream commit cc5d1692600613e72f32af60e27330fe0c79f4fe ]
Currently we don't clear MSDC interrupts when cqe off/disable, which led
to the data complete interrupt will be reserved for the next command.
If the next command with data transfer after cqe off/disable, we process
the CMD ready interrupt and trigger DMA start for data, but the data
complete interrupt is already exists, then SW assume that the data transfer
is complete, SW will trigger DMA stop, but the data may not be transmitted
yet or is transmitting, so we may encounter the following error:
mtk-msdc 11230000.mmc: CMD bus busy detected.
Signed-off-by: Wenbin Mei <wenbin.mei@xxxxxxxxxxxx>
Fixes: 88bd652b3c74 ("mmc: mediatek: command queue support")
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20220728080048.21336-1-wenbin.mei@xxxxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index f9b2897569bb4..99d8881a7d6c2 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -2345,6 +2345,9 @@ static void msdc_cqe_disable(struct mmc_host *mmc, bool recovery)
/* disable busy check */
sdr_clr_bits(host->base + MSDC_PATCH_BIT1, MSDC_PB1_BUSY_CHECK_SEL);
+ val = readl(host->base + MSDC_INT);
+ writel(val, host->base + MSDC_INT);
+
if (recovery) {
sdr_set_field(host->base + MSDC_DMA_CTRL,
MSDC_DMA_CTRL_STOP, 1);
@@ -2785,11 +2788,14 @@ static int __maybe_unused msdc_suspend(struct device *dev)
{
struct mmc_host *mmc = dev_get_drvdata(dev);
int ret;
+ u32 val;
if (mmc->caps2 & MMC_CAP2_CQE) {
ret = cqhci_suspend(mmc);
if (ret)
return ret;
+ val = readl(((struct msdc_host *)mmc_priv(mmc))->base + MSDC_INT);
+ writel(val, ((struct msdc_host *)mmc_priv(mmc))->base + MSDC_INT);
}
return pm_runtime_force_suspend(dev);
