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

[Matt Redfearn]

On 24/06/2019 12:44, Andrzej Hajda wrote:
> On 24.06.2019 13:02, Matt Redfearn wrote:
>> Hi,
>> Anything stopping this being applied?
> 
> 
> Queued to drm-misc-next.

Thanks Andrzej!

> 
> --
> 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 at st.com>
>>> Reviewed-by: Philippe Cornu <philippe.cornu at 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 at 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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>