linux-kernel - Re: [PATCHv2 09/10] drm: omapdrm: crtc: get manual mode displays working

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Date:   Mon, 20 Mar 2017 13:19:24 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...com>
To:     Sebastian Reichel <sre@...nel.org>,
        Tony Lindgren <tony@...mide.com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:     David Airlie <airlied@...ux.ie>, <linux-omap@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 09/10] drm: omapdrm: crtc: get manual mode displays
 working

On 05/03/17 02:43, Sebastian Reichel wrote:
> From: Tony Lindgren <tony@...mide.com>
> 
> With manual mode displays we need to flush the panel manually.
> 
> Let's add flushing so we get Tomi's fbtest, kmstest, kmstest --flip,
> and X and wayland working.
> 
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> [On Nokia N950]
> Tested-By: Sebastian Reichel <sre@...nel.org>
> ---
>  drivers/gpu/drm/omapdrm/omap_crtc.c | 22 +++++++++++++++-------
>  1 file changed, 15 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.c b/drivers/gpu/drm/omapdrm/omap_crtc.c
> index 4601533215d6..e07b0a0be4bf 100644
> --- a/drivers/gpu/drm/omapdrm/omap_crtc.c
> +++ b/drivers/gpu/drm/omapdrm/omap_crtc.c
> @@ -97,6 +97,11 @@ bool omap_crtc_is_manual_updated(struct drm_crtc *crtc)
>  	return omap_crtc->manually_updated;
>  }
>  
> +static void omap_crtc_manual_needs_flush(struct drm_crtc *crtc)
> +{
> +	omap_crtc_flush(crtc, 0, 0, 0, 0);
> +}
> +
>  /* -----------------------------------------------------------------------------
>   * DSS Manager Functions
>   */
> @@ -139,7 +144,11 @@ static void omap_crtc_dss_disconnect(enum omap_channel channel,
>  
>  static void omap_crtc_dss_start_update(enum omap_channel channel)
>  {
> +	struct omap_crtc *omap_crtc = omap_crtcs[channel];
> +	struct drm_crtc *crtc = &omap_crtc->base;
> +
>  	dispc_mgr_enable(channel, true);
> +	omap_crtc_manual_needs_flush(crtc);
>  }
>  
>  /* Called only from the encoder enable/disable and suspend/resume handlers. */
> @@ -155,11 +164,12 @@ static void omap_crtc_set_enabled(struct drm_crtc *crtc, bool enable)
>  	if (WARN_ON(omap_crtc->enabled == enable))
>  		return;
>  
> -	if (omap_crtc_output[channel]->output_type == OMAP_DISPLAY_TYPE_HDMI) {
> -		dispc_mgr_enable(channel, enable);
> -		omap_crtc->enabled = enable;
> +	dispc_mgr_enable(channel, enable);

Moving the mgr_enable here causes a race issue, as the irqs are only
registered later below.

 Tomi



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