linux-kernel - Re: [PATCH v2 24/26] drm/rockchip: dw-mipi-dsi: support non-burst modes

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Date:   Mon, 23 Jan 2017 14:11:13 +0800
From:   Chris Zhong <zyw@...k-chips.com>
To:     John Keeping <john@...anate.com>,
        Mark Yao <mark.yao@...k-chips.com>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 24/26] drm/rockchip: dw-mipi-dsi: support non-burst
 modes

Reviewed-by: Chris Zhong <zyw@...k-chips.com>

On 01/22/2017 12:31 AM, John Keeping wrote:
> Signed-off-by: John Keeping <john@...anate.com>
> ---
> Unchanged in v2
> ---
>   drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 16 +++++++++-------
>   1 file changed, 9 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> index 2dafb17e31d2..881bb0c62ca5 100644
> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> @@ -82,6 +82,7 @@
>   #define FRAME_BTA_ACK			BIT(14)
>   #define ENABLE_LOW_POWER		(0x3f << 8)
>   #define ENABLE_LOW_POWER_MASK		(0x3f << 8)
> +#define VID_MODE_TYPE_NON_BURST_SYNC_EVENTS	0x1
>   #define VID_MODE_TYPE_BURST_SYNC_PULSES		0x2
>   #define VID_MODE_TYPE_MASK			0x3
>   
> @@ -286,6 +287,7 @@ struct dw_mipi_dsi {
>   	u32 format;
>   	u16 input_div;
>   	u16 feedback_div;
> +	unsigned long mode_flags;
>   
>   	const struct dw_mipi_dsi_plat_data *pdata;
>   };
> @@ -548,15 +550,10 @@ static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
>   		return -EINVAL;
>   	}
>   
> -	if (!(device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) ||
> -	    !(device->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)) {
> -		dev_err(dsi->dev, "device mode is unsupported\n");
> -		return -EINVAL;
> -	}
> -
>   	dsi->lanes = device->lanes;
>   	dsi->channel = device->channel;
>   	dsi->format = device->format;
> +	dsi->mode_flags = device->mode_flags;
>   	dsi->panel = of_drm_find_panel(device->dev.of_node);
>   	if (dsi->panel)
>   		return drm_panel_attach(dsi->panel, &dsi->connector);
> @@ -713,7 +710,12 @@ static void dw_mipi_dsi_video_mode_config(struct dw_mipi_dsi *dsi)
>   {
>   	u32 val;
>   
> -	val = VID_MODE_TYPE_BURST_SYNC_PULSES | ENABLE_LOW_POWER;
> +	val = ENABLE_LOW_POWER;
> +
> +	if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
> +		val |= VID_MODE_TYPE_BURST_SYNC_PULSES;
> +	else if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE))
> +		val |= VID_MODE_TYPE_NON_BURST_SYNC_EVENTS;
>   
>   	dsi_write(dsi, DSI_VID_MODE_CFG, val);
>   }