linux-kernel - Re: [PATCH v2 1/5] drm/bridge/synopsys: dsi: move phy

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Date:   Tue, 12 Nov 2019 15:37:17 +0000
From:   Philippe CORNU <philippe.cornu@...com>
To:     Heiko Stuebner <heiko.stuebner@...obroma-systems.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "a.hajda@...sung.com" <a.hajda@...sung.com>
CC:     "hjc@...k-chips.com" <hjc@...k-chips.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "narmstrong@...libre.com" <narmstrong@...libre.com>,
        "Laurent.pinchart@...asonboard.com" 
        <Laurent.pinchart@...asonboard.com>,
        "jonas@...boo.se" <jonas@...boo.se>,
        "jernej.skrabec@...l.net" <jernej.skrabec@...l.net>,
        Yannick FERTRE <yannick.fertre@...com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-rockchip@...ts.infradead.org" 
        <linux-rockchip@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "heiko@...ech.de" <heiko@...ech.de>,
        "christoph.muellner@...obroma-systems.com" 
        <christoph.muellner@...obroma-systems.com>
Subject: Re: [PATCH v2 1/5] drm/bridge/synopsys: dsi: move phy_ops callbacks
 around panel enablement

Hi Heiko,

On 11/8/19 1:02 AM, Heiko Stuebner wrote:
> If implementation-specific phy_ops need to be defined they probably
> should be enabled before trying to talk to the panel and disabled only
> after the panel was disabled.
> 
> Right now they are enabled last and disabled first, so might make it
> impossible to talk to some panels - example for this being the px30
> with an external Innosilicon dphy that needs the phy to be enabled
> to transfer commands to the panel.
> 
> So move the calls appropriately.
> 
> Signed-off-by: Heiko Stuebner <heiko.stuebner@...obroma-systems.com>
> ---
>   drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 13 ++++++-------
>   1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> index 675442bfc1bd..49f5600a1dea 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> @@ -797,9 +797,6 @@ static void dw_mipi_dsi_bridge_post_disable(struct drm_bridge *bridge)
>   	struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
>   	const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
>   
> -	if (phy_ops->power_off)
> -		phy_ops->power_off(dsi->plat_data->priv_data);
> -
>   	/*
>   	 * Switch to command mode before panel-bridge post_disable &
>   	 * panel unprepare.
> @@ -816,6 +813,9 @@ static void dw_mipi_dsi_bridge_post_disable(struct drm_bridge *bridge)
>   	 */
>   	dsi->panel_bridge->funcs->post_disable(dsi->panel_bridge);
>   
> +	if (phy_ops->power_off)
> +		phy_ops->power_off(dsi->plat_data->priv_data);
> +
>   	if (dsi->slave) {
>   		dw_mipi_dsi_disable(dsi->slave);
>   		clk_disable_unprepare(dsi->slave->pclk);
> @@ -882,6 +882,9 @@ static void dw_mipi_dsi_mode_set(struct dw_mipi_dsi *dsi,
>   
>   	/* Switch to cmd mode for panel-bridge pre_enable & panel prepare */
>   	dw_mipi_dsi_set_mode(dsi, 0);
> +
> +	if (phy_ops->power_on)
> +		phy_ops->power_on(dsi->plat_data->priv_data);
>   }
>   
>   static void dw_mipi_dsi_bridge_mode_set(struct drm_bridge *bridge,
> @@ -898,15 +901,11 @@ static void dw_mipi_dsi_bridge_mode_set(struct drm_bridge *bridge,
>   static void dw_mipi_dsi_bridge_enable(struct drm_bridge *bridge)
>   {
>   	struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
> -	const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
>   
>   	/* Switch to video mode for panel-bridge enable & panel enable */
>   	dw_mipi_dsi_set_mode(dsi, MIPI_DSI_MODE_VIDEO);
>   	if (dsi->slave)
>   		dw_mipi_dsi_set_mode(dsi->slave, MIPI_DSI_MODE_VIDEO);
> -
> -	if (phy_ops->power_on)
> -		phy_ops->power_on(dsi->plat_data->priv_data);
>   }
>   
>   static enum drm_mode_status
> 

Tested-by: Yannick Fertre <yannick.fertre@...com>
Reviewed-by: Philippe Cornu <philippe.cornu@...com>

Many thanks,
Philippe :-)