linux-kernel - Re: [PATCH v2] drm/bridge/synopsys: dsi: allow LP commands in video mode

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Message-ID: <0df822a2-a6a6-0ec6-a6c2-a59b821113c3@st.com>
Date:   Fri, 10 Jul 2020 08:43:51 +0000
From:   Philippe CORNU <philippe.cornu@...com>
To:     Yannick FERTRE <yannick.fertre@...com>,
        Benjamin GAIGNARD <benjamin.gaignard@...com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "Alexandre TORGUE" <alexandre.torgue@...com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Antonio BORNEO <antonio.borneo@...com>
Subject: Re: [PATCH v2] drm/bridge/synopsys: dsi: allow LP commands in video
 mode



On 7/8/20 4:08 PM, Yannick Fertre wrote:
> From: Antonio Borneo <antonio.borneo@...com>
> 
> Current code only sends LP commands in command mode.
> 
> Allows sending LP commands also in video mode by setting the
> proper flag in DSI_VID_MODE_CFG.
> 
> Signed-off-by: Antonio Borneo <antonio.borneo@...com>
> ---
>   drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> index 1a24ea648ef8..e9a0f42ff99f 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> @@ -89,6 +89,7 @@
>   #define VID_MODE_TYPE_NON_BURST_SYNC_EVENTS	0x1
>   #define VID_MODE_TYPE_BURST			0x2
>   #define VID_MODE_TYPE_MASK			0x3
> +#define ENABLE_LOW_POWER_CMD		BIT(15)
>   #define VID_MODE_VPG_ENABLE		BIT(16)
>   #define VID_MODE_VPG_HORIZONTAL		BIT(24)
>   
> @@ -376,6 +377,13 @@ static void dw_mipi_message_config(struct dw_mipi_dsi *dsi,
>   
>   	dsi_write(dsi, DSI_LPCLK_CTRL, lpm ? 0 : PHY_TXREQUESTCLKHS);
>   	dsi_write(dsi, DSI_CMD_MODE_CFG, val);
> +
> +	val = dsi_read(dsi, DSI_VID_MODE_CFG);
> +	if (lpm)
> +		val |= ENABLE_LOW_POWER_CMD;
> +	else
> +		val &= ~ENABLE_LOW_POWER_CMD;
> +	dsi_write(dsi, DSI_VID_MODE_CFG, val);
>   }
>   
>   static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
> 

(+ Antonio)

Hi Yannick & Antonio,

Reviewed-by: Philippe Cornu <philippe.cornu@...com>
Tested-by: Philippe Cornu <philippe.cornu@...com>

(Tested with the 3 patches named
drm/bridge/synopsys: dsi: allow LP commands in video mode
drm/bridge/synopsys: dsi: allow sending longer LP commands
drm/bridge/synopsys: dsi: add support for non-continuous HS clock
on various dsi bridges + stm32mp157 disco board)

Many thanks
Philippe :-)