linux-kernel - Re: [PATCH v1 2/2] drm/stm: dsi: add power on/off phy ops

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Message-ID: <91abfd99-1737-33bb-77aa-2bf1f076cebd@samsung.com>
Date:   Wed, 12 Jun 2019 09:02:09 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Yannick Fertré <yannick.fertre@...com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Heiko Stuebner <heiko@...ech.de>,
        Sam Ravnborg <sam@...nborg.org>,
        Nickey Yang <nickey.yang@...k-chips.com>,
        Philippe Cornu <philippe.cornu@...com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Vincent Abriou <vincent.abriou@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        dri-devel@...ts.freedesktop.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] drm/stm: dsi: add power on/off phy ops

On 27.05.2019 12:21, Yannick Fertré wrote:
> These new physical operations are helpful to power_on/off the dsi
> wrapper. If the dsi wrapper is powered in video mode, the display
> controller (ltdc) register access will hang when DSI fifos are full.
>
> Signed-off-by: Yannick Fertré <yannick.fertre@...com>


Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>


 --
Regards
Andrzej


> ---
>  drivers/gpu/drm/stm/dw_mipi_dsi-stm.c | 21 ++++++++++++++++++++-
>  1 file changed, 20 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> index 01db020..0ab32fe 100644
> --- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> +++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> @@ -210,10 +210,27 @@ static int dw_mipi_dsi_phy_init(void *priv_data)
>  	if (ret)
>  		DRM_DEBUG_DRIVER("!TIMEOUT! waiting PLL, let's continue\n");
>  
> +	return 0;
> +}
> +
> +static void dw_mipi_dsi_phy_power_on(void *priv_data)
> +{
> +	struct dw_mipi_dsi_stm *dsi = priv_data;
> +
> +	DRM_DEBUG_DRIVER("\n");
> +
>  	/* Enable the DSI wrapper */
>  	dsi_set(dsi, DSI_WCR, WCR_DSIEN);
> +}
>  
> -	return 0;
> +static void dw_mipi_dsi_phy_power_off(void *priv_data)
> +{
> +	struct dw_mipi_dsi_stm *dsi = priv_data;
> +
> +	DRM_DEBUG_DRIVER("\n");
> +
> +	/* Disable the DSI wrapper */
> +	dsi_clear(dsi, DSI_WCR, WCR_DSIEN);
>  }
>  
>  static int
> @@ -287,6 +304,8 @@ dw_mipi_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode,
>  
>  static const struct dw_mipi_dsi_phy_ops dw_mipi_dsi_stm_phy_ops = {
>  	.init = dw_mipi_dsi_phy_init,
> +	.power_on = dw_mipi_dsi_phy_power_on,
> +	.power_off = dw_mipi_dsi_phy_power_off,
>  	.get_lane_mbps = dw_mipi_dsi_get_lane_mbps,
>  };
>