linux-kernel - Re: [PATCH v4 06/13] drm/bridge: Add Synopsys DesignWare MIPI DSI host controller driver

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Date:	Thu, 26 Nov 2015 15:03:54 +0800
From:	Chris Zhong <zyw@...k-chips.com>
To:	Thierry Reding <treding@...dia.com>
Cc:	heiko@...ech.de, linux-rockchip@...ts.infradead.org,
	mark.yao@...k-chips.com, emil.l.velikov@...il.com,
	airlied@...ux.ie, ajaykumar.rs@...sung.com,
	rmk+kernel@....linux.org.uk, dri-devel@...ts.freedesktop.org,
	Inki Dae <inki.dae@...sung.com>, Takashi Iwai <tiwai@...e.de>,
	Vincent Palatin <vpalatin@...omium.org>,
	Andy Yan <andy.yan@...k-chips.com>,
	Rahul Sharma <rahul.sharma@...sung.com>,
	Sean Paul <seanpaul@...omium.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 06/13] drm/bridge: Add Synopsys DesignWare MIPI DSI
 host controller driver

Hi Thierry

Thanks for your feedback.


On 11/21/2015 12:07 AM, Thierry Reding wrote:
> On Fri, Nov 20, 2015 at 04:15:32PM +0800, Chris Zhong wrote:
>> add Synopsys DesignWare MIPI DSI host controller driver support.
>>
>> Signed-off-by: Chris Zhong <zyw@...k-chips.com>
>> ---
>>
>> Changes in v4:
>> eliminate some warnning
>>
>> Changes in v3: None
>> Changes in v2: None
>>
>>   drivers/gpu/drm/bridge/Kconfig       |   11 +
>>   drivers/gpu/drm/bridge/Makefile      |    1 +
>>   drivers/gpu/drm/bridge/dw_mipi_dsi.c | 1056 ++++++++++++++++++++++++++++++++++
>>   include/drm/bridge/dw_mipi_dsi.h     |   27 +
>>   4 files changed, 1095 insertions(+)
>>   create mode 100644 drivers/gpu/drm/bridge/dw_mipi_dsi.c
>>   create mode 100644 include/drm/bridge/dw_mipi_dsi.h
>>
>>
>> +struct dw_mipi_dsi {
>> +	struct mipi_dsi_host dsi_host;
>> +	struct drm_connector connector;
>> +	struct drm_encoder *encoder;
> struct drm_bridge already has a pointer to an encoder, can't you reuse
> that instead?
>
>> +	struct drm_bridge *bridge;
> Typically you'd embed the bridge into the driver structure.
I'm almost done with all the modifications according to your comments.
Remaining this point I can not understand, the dsi is a pointer of 
drm_bridge,
hence I can not get the bridge by container_of.
Although, the "bridge->driver_private = dsi" have done in 
dw_mipi_dsi_register.

>
>> +	struct drm_panel *panel;
>> +	struct device *dev;
>> +
>> +	void __iomem *base;
>> +
>> +	struct clk *pllref_clk;
>> +	struct clk *cfg_clk;
>> +	struct clk *pclk;
>> +
>> +	unsigned int lane_mbps; /* per lane */
>> +	u32 channel;
>> +	u32 lanes;
>> +	u32 format;
>> +	u16 input_div;
>> +	u16 feedback_div;
>> +	struct drm_display_mode *mode;
>> +
>> +	const struct dw_mipi_dsi_plat_data *pdata;
>> +
>> +	bool enabled;
>> +};
>> +
>>
>>
>> Thierry


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