Hi Linus.
On Sun, Jul 19, 2020 at 01:33:22AM +0200, Linus Walleij wrote:
> Whenener a display update was sent, apart from updating
s/Whenener/Whenever
> the memory base address we called mcde_display_send_one_frame()
^ insert comma?
> which also sent a command to the display requesting the TE IRQ
> and enabling the FIFO.
>
> When continous updates are running this is wrong: we need
> to only send this to start the flow to the display on
> the very first update. This lead to the display pipeline
> locking up and crashing.
>
> Check if the flow is already running and in that case
> do not call mcde_display_send_one_frame().
>
> This fixes crashes on the Samsung GT-S7710 (Skomer).
>
> Cc: Stephan Gerhold <stephan@xxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Patch looks fine.
Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/mcde/mcde_display.c | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/mcde/mcde_display.c b/drivers/gpu/drm/mcde/mcde_display.c
> index 212aee60cf61..1d8ea8830a17 100644
> --- a/drivers/gpu/drm/mcde/mcde_display.c
> +++ b/drivers/gpu/drm/mcde/mcde_display.c
> @@ -1086,9 +1086,14 @@ static void mcde_display_update(struct drm_simple_display_pipe *pipe,
> */
> if (fb) {
> mcde_set_extsrc(mcde, drm_fb_cma_get_gem_addr(fb, pstate, 0));
> - if (!mcde->video_mode)
> - /* Send a single frame using software sync */
> - mcde_display_send_one_frame(mcde);
> + if (!mcde->video_mode) {
> + /*
> + * Send a single frame using software sync if the flow
> + * is not active yet.
> + */
> + if (mcde->flow_active == 0)
> + mcde_display_send_one_frame(mcde);
> + }
> dev_info_once(mcde->dev, "sent first display update\n");
> } else {
> /*
> --
> 2.26.2
>
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