This is a note to let you know that I've just added the patch titled
i2c: tegra: Fix i2c-tegra DMA config option processing
to the 6.1-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:
i2c-tegra-fix-i2c-tegra-dma-config-option-processing.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 27ec43c77b5db780a56fc3a6d6de6bf2f74614f7 Mon Sep 17 00:00:00 2001
From: Parker Newman <pnewman@xxxxxxxxxxxxxxx>
Date: Tue, 8 Aug 2023 16:01:06 +0200
Subject: i2c: tegra: Fix i2c-tegra DMA config option processing
From: Parker Newman <pnewman@xxxxxxxxxxxxxxx>
commit 27ec43c77b5db780a56fc3a6d6de6bf2f74614f7 upstream.
Tegra processors prior to Tegra186 used APB DMA for I2C requiring
CONFIG_TEGRA20_APB_DMA=y while Tegra186 and later use GPC DMA requiring
CONFIG_TEGRA186_GPC_DMA=y.
The check for if the processor uses APB DMA is inverted and so the wrong
DMA config options are checked.
This means if CONFIG_TEGRA20_APB_DMA=y but CONFIG_TEGRA186_GPC_DMA=n
with a Tegra186 or later processor the driver will incorrectly think DMA is
enabled and attempt to request DMA channels that will never be availible,
leaving the driver in a perpetual EPROBE_DEFER state.
Fixes: 48cb6356fae1 ("i2c: tegra: Add GPCDMA support")
Signed-off-by: Parker Newman <pnewman@xxxxxxxxxxxxxxx>
Acked-by: Andi Shyti <andi.shyti@xxxxxxxxxx>
Acked-by: Akhil R <akhilrajeev@xxxxxxxxxx>
Link: https://lore.kernel.org/r/fcfcf9b3-c8c4-9b34-2ff8-cd60a3d490bd@xxxxxxxxxxxxxxx
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-tegra.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -449,7 +449,7 @@ static int tegra_i2c_init_dma(struct teg
if (i2c_dev->is_vi)
return 0;
- if (!i2c_dev->hw->has_apb_dma) {
+ if (i2c_dev->hw->has_apb_dma) {
if (!IS_ENABLED(CONFIG_TEGRA20_APB_DMA)) {
dev_dbg(i2c_dev->dev, "APB DMA support not enabled\n");
return 0;
Patches currently in stable-queue which might be from pnewman@xxxxxxxxxxxxxxx are
queue-6.1/i2c-tegra-fix-i2c-tegra-dma-config-option-processing.patch
