Hi Tomi,
Thanks for the patch.
> Subject: [PATCH v2 1/4] drm: rcar-du: dsi: Properly stop video mode TX
>
> From: Tomi Valkeinen <tomi.valkeinen+renesas@xxxxxxxxxxxxxxxx>
>
> The driver does not explicitly stop the video mode transmission when
> disabling the output. While this doesn't seem to be causing any issues,
> lets follow the steps described in the documentation and add a
> rcar_mipi_dsi_stop_video() which stop the video mode transmission. This
> function will also be used in later patches to stop the video
> transmission even if the DSI IP is not shut down.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@xxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c | 29 +++++++++++++++++++++++++
> 1 file changed, 29 insertions(+)
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> index 62f7eb84ab01..7f2be490fcf8 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> @@ -542,6 +542,34 @@ static int rcar_mipi_dsi_start_video(struct
> rcar_mipi_dsi *dsi)
> return 0;
> }
>
> +static void rcar_mipi_dsi_stop_video(struct rcar_mipi_dsi *dsi) {
> + u32 status;
> + int ret;
> +
> + /* Disable transmission in video mode. */
> + rcar_mipi_dsi_clr(dsi, TXVMCR, TXVMCR_EN_VIDEO);
> +
> + ret = read_poll_timeout(rcar_mipi_dsi_read, status,
> + !(status & TXVMSR_ACT),
> + 2000, 100000, false, dsi, TXVMSR);
> + if (ret < 0) {
> + dev_err(dsi->dev, "Failed to disable video transmission\n");
> + return;
> + }
> +
> + /* Assert video FIFO clear. */
> + rcar_mipi_dsi_set(dsi, TXVMCR, TXVMCR_VFCLR);
> +
> + ret = read_poll_timeout(rcar_mipi_dsi_read, status,
> + !(status & TXVMSR_VFRDY),
> + 2000, 100000, false, dsi, TXVMSR);
> + if (ret < 0) {
> + dev_err(dsi->dev, "Failed to assert video FIFO clear\n");
> + return;
This return is not required.
Cheers,
Biju
> + }
> +}
> +
> /* --------------------------------------------------------------------
> ---------
> * Bridge
> */
> @@ -601,6 +629,7 @@ static void rcar_mipi_dsi_atomic_disable(struct
> drm_bridge *bridge, {
> struct rcar_mipi_dsi *dsi = bridge_to_rcar_mipi_dsi(bridge);
>
> + rcar_mipi_dsi_stop_video(dsi);
> rcar_mipi_dsi_shutdown(dsi);
> rcar_mipi_dsi_clk_disable(dsi);
> }
> --
> 2.34.1
