linux-kernel - Re: [PATCH 1/4] drm/dsi: Add flag for continuous clock behavior

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Message-id: <53B5131B.1060702@samsung.com>
Date:	Thu, 03 Jul 2014 10:23:55 +0200
From:	Andrzej Hajda <a.hajda@...sung.com>
To:	Alexandre Courbot <acourbot@...dia.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Terje Bergstrom <tbergstrom@...dia.com>,
	Stephen Warren <swarren@...dotorg.org>
Cc:	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 1/4] drm/dsi: Add flag for continuous clock behavior


Hi Alexandre,

Thanks for the patch.

On 07/02/2014 02:19 PM, Alexandre Courbot wrote:
> As per section 5.6.1 of the DSI specification, all DSI transmitters must
> support continuous clock behavior on the clock lane, while non-continuous
> mode support is only optional. Add a flag that allows devices to indicate
> that they require continuous clock mode to operate properly.
> 
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> ---
>  include/drm/drm_mipi_dsi.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
> index 944f33f..5913ef4 100644
> --- a/include/drm/drm_mipi_dsi.h
> +++ b/include/drm/drm_mipi_dsi.h
> @@ -94,6 +94,8 @@ void mipi_dsi_host_unregister(struct mipi_dsi_host *host);
>  #define MIPI_DSI_MODE_VSYNC_FLUSH	BIT(8)
>  /* disable EoT packets in HS mode */
>  #define MIPI_DSI_MODE_EOT_PACKET	BIT(9)
> +/* use continuous clock behavior on the clock lane */
> +#define MIPI_DSI_MODE_CLOCK_CONTINUOUS	BIT(10)
>  

According to MIPI DSI specification "All DSI transmitters and receivers
shall support continuous clock behavior on the Clock Lane, and
optionally may support non-continuous clock behavior". It suggests that
continuous clock should be default behavior. So maybe better is to
introduce sth like:
+#define MIPI_DSI_MODE_CLOCK_NON_CONTINUOUS	BIT(10)


Regards
Andrzej
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