linux-kernel - Re: [PATCH v2] drm/bridge/synopsys: dsi: Allow VPG to be enabled via debugfs

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Message-ID: <fd4f3c69-5bbd-a7ac-983c-4aa9a2a2313e@thinci.com>
Date:   Mon, 24 Jun 2019 11:02:12 +0000
From:   Matt Redfearn <matt.redfearn@...nci.com>
To:     Philippe CORNU <philippe.cornu@...com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>
CC:     Archit Taneja <architt@...eaurora.org>,
        David Airlie <airlied@...ux.ie>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Matthew Redfearn <matthew.redfearn@...nci.com>,
        Yannick FERTRE <yannick.fertre@...com>,
        Nickey Yang <nickey.yang@...k-chips.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v2] drm/bridge/synopsys: dsi: Allow VPG to be enabled via
 debugfs

Hi,
Anything stopping this being applied?

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