linux-kernel - [PATCH] i2c: tegra: Fix i2c-tegra DMA config option processing

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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