linux-kernel - Re: [PATCH 1/3] dmaengine: qcom: gpi: set chain and link flag for duplex

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Date:   Tue, 12 Apr 2022 14:30:44 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dmaengine: qcom: gpi: set chain and link flag for
 duplex

On Wed 06 Apr 06:25 PDT 2022, Vinod Koul wrote:

> Newer platforms seem to have strict requirement for TRE flags which
> causes transaction to timeout. This was resolved to missing chain and
> link flag for duplex spi transaction.
> 
> So add these two flags.
> 
> Signed-off-by: Vinod Koul <vkoul@...nel.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Tested-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
>  drivers/dma/qcom/gpi.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/qcom/gpi.c b/drivers/dma/qcom/gpi.c
> index 94f3648f7483..3429ceccd13b 100644
> --- a/drivers/dma/qcom/gpi.c
> +++ b/drivers/dma/qcom/gpi.c
> @@ -1754,10 +1754,14 @@ static int gpi_create_spi_tre(struct gchan *chan, struct gpi_desc *desc,
>  		tre->dword[2] = u32_encode_bits(spi->rx_len, TRE_RX_LEN);
>  
>  		tre->dword[3] = u32_encode_bits(TRE_TYPE_GO, TRE_FLAGS_TYPE);
> -		if (spi->cmd == SPI_RX)
> +		if (spi->cmd == SPI_RX) {
>  			tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_IEOB);
> -		else
> +		} else if (spi->cmd == SPI_TX) {
> +			tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_CHAIN);
> +		} else { /* SPI_DUPLEX */
>  			tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_CHAIN);
> +			tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_LINK);
> +		}
>  	}
>  
>  	/* create the dma tre */
> -- 
> 2.34.1
>