Re: [PATCH 1/4] dmaengine: ti: cppi41: Use td_queue to restore DMA_TDFDQ

["Adivi, Sai Sree Kartheek" <s-adivi@ti.com>]

On 04/11/26 01:07, Markus Schneider-Pargmann (TI) wrote:
> In init_cppi41() td_queue.submit is used to setup DMA_TDFDQ. In
> suspend/resume the same value is read, stored and restored.
>
> To get rid of the suspend register access, use td_queue.submit in resume
> as well to restore the value.
>
> Cc: stable@vger.kernel.org
> Signed-off-by: Markus Schneider-Pargmann (TI) <msp@baylibre.com>
Reviewed-by: Sai Sree Kartheek Adivi <s-adivi@ti.com>
> ---
>   drivers/dma/ti/cppi41.c | 6 +-----
>   1 file changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/drivers/dma/ti/cppi41.c b/drivers/dma/ti/cppi41.c
> index 88756dccd62c..458d20b12462 100644
> --- a/drivers/dma/ti/cppi41.c
> +++ b/drivers/dma/ti/cppi41.c
> @@ -146,9 +146,6 @@ struct cppi41_dd {
>   	struct list_head pending;	/* Pending queued transfers */
>   	spinlock_t lock;		/* Lock for pending list */
>   
> -	/* context for suspend/resume */
> -	unsigned int dma_tdfdq;
> -
>   	bool is_suspended;
>   };
>   
> @@ -1174,7 +1171,6 @@ static int __maybe_unused cppi41_suspend(struct device *dev)
>   {
>   	struct cppi41_dd *cdd = dev_get_drvdata(dev);
>   
> -	cdd->dma_tdfdq = cppi_readl(cdd->ctrl_mem + DMA_TDFDQ);
>   	disable_sched(cdd);
>   
>   	return 0;
> @@ -1195,7 +1191,7 @@ static int __maybe_unused cppi41_resume(struct device *dev)
>   
>   	init_sched(cdd);
>   
> -	cppi_writel(cdd->dma_tdfdq, cdd->ctrl_mem + DMA_TDFDQ);
> +	cppi_writel(cdd->td_queue.submit, cdd->ctrl_mem + DMA_TDFDQ);
>   	cppi_writel(cdd->scratch_phys, cdd->qmgr_mem + QMGR_LRAM0_BASE);
>   	cppi_writel(QMGR_SCRATCH_SIZE, cdd->qmgr_mem + QMGR_LRAM_SIZE);
>   	cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM1_BASE);
>