Hi Laxman and/or Dmitry,
On Thu, Aug 03, 2023 at 05:10:02PM +0000, Parker Newman wrote:
>
> 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@xxxxxxxxxxxxxxx>
> ---
> 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;
Can I have your opinion here, please?
Andi
