linux-kernel - Re: [PATCH v1 2/5] drm/bridge: tc358768: Support pulse mode

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Date:   Tue, 19 Oct 2021 10:55:12 +0200
From:   Robert Foss <robert.foss@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Maxim Schwalm <maxim.schwalm@...il.com>,
        Andreas Westman Dorcsak <hedmoo@...oo.com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-tegra@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/5] drm/bridge: tc358768: Support pulse mode

On Sun, 3 Oct 2021 at 01:35, Dmitry Osipenko <digetx@...il.com> wrote:
>
> Support pulse-mode synchronization which is supported and used by simple
> DSI panels like Panasonic VVX10F004B00.
>
> Tested-by: Andreas Westman Dorcsak <hedmoo@...oo.com> # Asus TF700T
> Tested-by: Maxim Schwalm <maxim.schwalm@...il.com> #TF700T
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/gpu/drm/bridge/tc358768.c | 66 ++++++++++++++++++++++---------
>  1 file changed, 48 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c
> index 18ae6605a803..10ebd0621ad3 100644
> --- a/drivers/gpu/drm/bridge/tc358768.c
> +++ b/drivers/gpu/drm/bridge/tc358768.c
> @@ -785,24 +785,54 @@ static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
>         /* START[0] */
>         tc358768_write(priv, TC358768_STARTCNTRL, 1);
>
> -       /* Set event mode */
> -       tc358768_write(priv, TC358768_DSI_EVENT, 1);
> -
> -       /* vsw (+ vbp) */
> -       tc358768_write(priv, TC358768_DSI_VSW,
> -                      mode->vtotal - mode->vsync_start);
> -       /* vbp (not used in event mode) */
> -       tc358768_write(priv, TC358768_DSI_VBPR, 0);
> -       /* vact */
> -       tc358768_write(priv, TC358768_DSI_VACT, mode->vdisplay);
> -
> -       /* (hsw + hbp) * byteclk * ndl / pclk */
> -       val = (u32)div_u64((mode->htotal - mode->hsync_start) *
> -                          ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
> -                          mode->clock * 1000);
> -       tc358768_write(priv, TC358768_DSI_HSW, val);
> -       /* hbp (not used in event mode) */
> -       tc358768_write(priv, TC358768_DSI_HBPR, 0);
> +       if (dsi_dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
> +               /* Set pulse mode */
> +               tc358768_write(priv, TC358768_DSI_EVENT, 0);
> +
> +               /* vact */
> +               tc358768_write(priv, TC358768_DSI_VACT, mode->vdisplay);
> +
> +               /* vsw */
> +               tc358768_write(priv, TC358768_DSI_VSW,
> +                              mode->vsync_end - mode->vsync_start);
> +               /* vbp */
> +               tc358768_write(priv, TC358768_DSI_VBPR,
> +                              mode->vtotal - mode->vsync_end);
> +
> +               /* hsw * byteclk * ndl / pclk */
> +               val = (u32)div_u64((mode->hsync_end - mode->hsync_start) *
> +                                  ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
> +                                  mode->clock * 1000);
> +               tc358768_write(priv, TC358768_DSI_HSW, val);
> +
> +               /* hbp * byteclk * ndl / pclk */
> +               val = (u32)div_u64((mode->htotal - mode->hsync_end) *
> +                                  ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
> +                                  mode->clock * 1000);
> +               tc358768_write(priv, TC358768_DSI_HBPR, val);
> +       } else {
> +               /* Set event mode */
> +               tc358768_write(priv, TC358768_DSI_EVENT, 1);
> +
> +               /* vact */
> +               tc358768_write(priv, TC358768_DSI_VACT, mode->vdisplay);
> +
> +               /* vsw (+ vbp) */
> +               tc358768_write(priv, TC358768_DSI_VSW,
> +                              mode->vtotal - mode->vsync_start);
> +               /* vbp (not used in event mode) */
> +               tc358768_write(priv, TC358768_DSI_VBPR, 0);
> +
> +               /* (hsw + hbp) * byteclk * ndl / pclk */
> +               val = (u32)div_u64((mode->htotal - mode->hsync_start) *
> +                                  ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
> +                                  mode->clock * 1000);
> +               tc358768_write(priv, TC358768_DSI_HSW, val);
> +
> +               /* hbp (not used in event mode) */
> +               tc358768_write(priv, TC358768_DSI_HBPR, 0);
> +       }
> +
>         /* hact (bytes) */
>         tc358768_write(priv, TC358768_DSI_HACT, hact);
>

Reviewed-by: Robert Foss <robert.foss@...aro.org>