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Message-ID: <fcfcf9b3-c8c4-9b34-2ff8-cd60a3d490bd@connecttech.com>
Date: Thu, 3 Aug 2023 17:10:02 +0000
From: Parker Newman <pnewman@...necttech.com>
To: Laxman Dewangan <ldewangan@...dia.com>,
Dmitry Osipenko <digetx@...il.com>,
Andi Shyti <andi.shyti@...nel.org>,
Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] i2c: tegra: Fix i2c-tegra DMA config option processing
This patch fixes the Tegra DMA config option processing in the
i2c-tegra driver.
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.
Signed-off-by: Parker Newman <pnewman@...necttech.com>
---
drivers/i2c/busses/i2c-tegra.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index bcbbf23aa530..dc6ed3a8d69e 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -442,7 +442,7 @@ static int tegra_i2c_init_dma(struct tegra_i2c_dev *i2c_dev)
if (IS_VI(i2c_dev))
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;
--
2.17.1
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