[PATCH] drm/etnaviv: fix DMA direction handling for cached read/write buffers

[Daniel Stone]

Hi Lucas,

On Fri, 26 Jan 2024 at 17:00, Lucas Stach <l.stach at pengutronix.de> wrote:
> The dma sync operation needs to be done with DMA_BIDIRECTIONAL when
> the BO is prepared for both read and write operations. With the
> current inverted if ladder it would only be synced for DMA_FROM_DEVICE.
>
> [...]
>
>  static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
>  {
> -       if (op & ETNA_PREP_READ)
> +       if (op & (ETNA_PREP_READ | ETNA_PREP_WRITE))
> +               return DMA_BIDIRECTIONAL;

This test will always be true for _either_ read or write.

Cheers,
Daniel