[Mesa-dev] [PATCH 5/8] radeonsi: Invalidate the L2 cache on framebuffer change.

[Marek Olšák]

On Fri, Sep 4, 2015 at 9:47 PM, Bas Nieuwenhuizen
<bas at basnieuwenhuizen.nl> wrote:
> This is needed by DCC when using compressed textures.
>
> Signed-off-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
> ---
>  src/gallium/drivers/radeonsi/si_state.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/src/gallium/drivers/radeonsi/si_state.c b/src/gallium/drivers/radeonsi/si_state.c
> index 5c9c866..3e11922 100644
> --- a/src/gallium/drivers/radeonsi/si_state.c
> +++ b/src/gallium/drivers/radeonsi/si_state.c
> @@ -2114,6 +2114,8 @@ static void si_set_framebuffer_state(struct pipe_context *ctx,
>          */
>         sctx->b.flags |= SI_CONTEXT_INV_TC_L1 |
>                          SI_CONTEXT_INV_TC_L2 |
> +                        SI_CONTEXT_PS_PARTIAL_FLUSH |
> +                        SI_CONTEXT_FLUSH_WITH_INV_L2 |

This may work, but I think it does too much.

The only hardware requirement I know of is that
CACHE_FLUSH_AND_INV_EVENT must be emitted before and after
DCC_DECOMPRESS. Is there any case where this is not sufficient?

Marek