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Subject: Re: [PATCH v2] drm/bridge/synopsys: dsi: Allow VPG to be enabled
 via debugfs
To:     Matt Redfearn <matt.redfearn@thinci.com>,
        Philippe CORNU <philippe.cornu@st.com>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc:     Archit Taneja <architt@codeaurora.org>,
        David Airlie <airlied@linux.ie>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Matthew Redfearn <matthew.redfearn@thinci.com>,
        Yannick FERTRE <yannick.fertre@st.com>,
        Nickey Yang <nickey.yang@rock-chips.com>,
        "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>
From:   Andrzej Hajda <a.hajda@samsung.com>
Message-ID: <d73e0df8-761d-380c-17f3-f3cbb737c677@samsung.com>
Date:   Mon, 24 Jun 2019 13:44:11 +0200
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References: <20190430081646.23845-1-matt.redfearn@thinci.com>
        <0832ec0c-cf21-7b43-17a7-dbe54513453c@st.com>
        <CGME20190624110224epcas3p45442d82c6f6c3e99311334c2603b9143@epcas3p4.samsung.com>
        <fd4f3c69-5bbd-a7ac-983c-4aa9a2a2313e@thinci.com>
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On 24.06.2019 13:02, Matt Redfearn wrote:
> Hi,
> Anything stopping this being applied?


Queued to drm-misc-next.

--
Regards
Andrzej


>
> Thanks,
> Matt
>
> On 03/05/2019 16:32, Philippe CORNU wrote:
>> Hi Matt,
>> and many thanks for the patch.
>>
>> Tested successfully by Yannick on STM32MP1 boards :-)
>>
>> Tested-by: Yannick Fertré <yannick.fertre@st.com>
>> Reviewed-by: Philippe Cornu <philippe.cornu@st.com>
>>
>> Thank you,
>> Philippe :-)
>>
>>
>> On 4/30/19 10:17 AM, Matt Redfearn wrote:
>>> The Synopsys MIPI DSI IP contains a video test pattern generator which
>>> is helpful in debugging video timing with connected displays.
>>> Add a debugfs directory containing files which allow the VPG to be
>>> enabled and disabled, and its orientation to be changed.
>>>
>>> Signed-off-by: Matt Redfearn <matt.redfearn@thinci.com>
>>>
>>> ---
>>>
>>> Changes in v2:
>>> - Ensure dw_mipi_dsi_video_mode_config() doesn't break without CONFIG_DEBUG_FS
>>> - Tidy up initialisation / tidy up of debugfs
>>>
>>>    drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 47 +++++++++++++++++++
>>>    1 file changed, 47 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>>> index 0ee440216b8..bffeef7a6cc 100644
>>> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>>> @@ -10,6 +10,7 @@
>>>    
>>>    #include <linux/clk.h>
>>>    #include <linux/component.h>
>>> +#include <linux/debugfs.h>
>>>    #include <linux/iopoll.h>
>>>    #include <linux/module.h>
>>>    #include <linux/of_device.h>
>>> @@ -86,6 +87,8 @@
>>>    #define VID_MODE_TYPE_NON_BURST_SYNC_EVENTS	0x1
>>>    #define VID_MODE_TYPE_BURST			0x2
>>>    #define VID_MODE_TYPE_MASK			0x3
>>> +#define VID_MODE_VPG_ENABLE		BIT(16)
>>> +#define VID_MODE_VPG_HORIZONTAL		BIT(24)
>>>    
>>>    #define DSI_VID_PKT_SIZE		0x3c
>>>    #define VID_PKT_SIZE(p)			((p) & 0x3fff)
>>> @@ -234,6 +237,13 @@ struct dw_mipi_dsi {
>>>    	u32 format;
>>>    	unsigned long mode_flags;
>>>    
>>> +#ifdef CONFIG_DEBUG_FS
>>> +	struct dentry *debugfs;
>>> +
>>> +	bool vpg;
>>> +	bool vpg_horizontal;
>>> +#endif /* CONFIG_DEBUG_FS */
>>> +
>>>    	struct dw_mipi_dsi *master; /* dual-dsi master ptr */
>>>    	struct dw_mipi_dsi *slave; /* dual-dsi slave ptr */
>>>    
>>> @@ -525,6 +535,13 @@ static void dw_mipi_dsi_video_mode_config(struct dw_mipi_dsi *dsi)
>>>    	else
>>>    		val |= VID_MODE_TYPE_NON_BURST_SYNC_EVENTS;
>>>    
>>> +#ifdef CONFIG_DEBUG_FS
>>> +	if (dsi->vpg) {
>>> +		val |= VID_MODE_VPG_ENABLE;
>>> +		val |= dsi->vpg_horizontal ? VID_MODE_VPG_HORIZONTAL : 0;
>>> +	}
>>> +#endif /* CONFIG_DEBUG_FS */
>>> +
>>>    	dsi_write(dsi, DSI_VID_MODE_CFG, val);
>>>    }
>>>    
>>> @@ -935,6 +952,33 @@ static const struct drm_bridge_funcs dw_mipi_dsi_bridge_funcs = {
>>>    	.attach	      = dw_mipi_dsi_bridge_attach,
>>>    };
>>>    
>>> +#ifdef CONFIG_DEBUG_FS
>>> +
>>> +static void dw_mipi_dsi_debugfs_init(struct dw_mipi_dsi *dsi)
>>> +{
>>> +	dsi->debugfs = debugfs_create_dir(dev_name(dsi->dev), NULL);
>>> +	if (IS_ERR(dsi->debugfs)) {
>>> +		dev_err(dsi->dev, "failed to create debugfs root\n");
>>> +		return;
>>> +	}
>>> +
>>> +	debugfs_create_bool("vpg", 0660, dsi->debugfs, &dsi->vpg);
>>> +	debugfs_create_bool("vpg_horizontal", 0660, dsi->debugfs,
>>> +			    &dsi->vpg_horizontal);
>>> +}
>>> +
>>> +static void dw_mipi_dsi_debugfs_remove(struct dw_mipi_dsi *dsi)
>>> +{
>>> +	debugfs_remove_recursive(dsi->debugfs);
>>> +}
>>> +
>>> +#else
>>> +
>>> +static void dw_mipi_dsi_debugfs_init(struct dw_mipi_dsi *dsi) { }
>>> +static void dw_mipi_dsi_debugfs_remove(struct dw_mipi_dsi *dsi) { }
>>> +
>>> +#endif /* CONFIG_DEBUG_FS */
>>> +
>>>    static struct dw_mipi_dsi *
>>>    __dw_mipi_dsi_probe(struct platform_device *pdev,
>>>    		    const struct dw_mipi_dsi_plat_data *plat_data)
>>> @@ -1005,6 +1049,7 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
>>>    		clk_disable_unprepare(dsi->pclk);
>>>    	}
>>>    
>>> +	dw_mipi_dsi_debugfs_init(dsi);
>>>    	pm_runtime_enable(dev);
>>>    
>>>    	dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
>>> @@ -1012,6 +1057,7 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
>>>    	ret = mipi_dsi_host_register(&dsi->dsi_host);
>>>    	if (ret) {
>>>    		dev_err(dev, "Failed to register MIPI host: %d\n", ret);
>>> +		dw_mipi_dsi_debugfs_remove(dsi);
>>>    		return ERR_PTR(ret);
>>>    	}
>>>    
>>> @@ -1029,6 +1075,7 @@ static void __dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi)
>>>    	mipi_dsi_host_unregister(&dsi->dsi_host);
>>>    
>>>    	pm_runtime_disable(dsi->dev);
>>> +	dw_mipi_dsi_debugfs_remove(dsi);
>>>    }
>>>    
>>>    void dw_mipi_dsi_set_slave(struct dw_mipi_dsi *dsi, struct dw_mipi_dsi *slave)
>>>
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