linux-kernel - Re: [PATCH v4 05/11] drm/bridge: synopsys: dw-hdmi: allow ycbcr420 modes for >= 0x200a

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Message-ID: <ab5eb3f3-44bd-84c2-6047-c7f32242305b@baylibre.com>
Date:   Mon, 2 Mar 2020 16:58:33 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     a.hajda@...sung.com, jonas@...boo.se, jernej.skrabec@...l.net,
        boris.brezillon@...labora.com, linux-amlogic@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 05/11] drm/bridge: synopsys: dw-hdmi: allow ycbcr420
 modes for >= 0x200a

On 02/03/2020 11:03, Laurent Pinchart wrote:
> Hi Neil,
> 
> Thank you for the patch.
> 
> On Thu, Feb 06, 2020 at 08:18:28PM +0100, Neil Armstrong wrote:
>> Now the DW-HDMI Controller supports the HDMI2.0 modes, enable support
>> for these modes in the connector if the platform supports them.
>> We limit these modes to DW-HDMI IP version >= 0x200a which
>> are designed to support HDMI2.0 display modes.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 6 ++++++
>>  include/drm/bridge/dw_hdmi.h              | 1 +
>>  2 files changed, 7 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> index 15048ad694bc..4b35ea1427df 100644
>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> @@ -3231,6 +3231,12 @@ __dw_hdmi_probe(struct platform_device *pdev,
>>  	hdmi->bridge.of_node = pdev->dev.of_node;
>>  #endif
>>  
>> +	if (hdmi->version >= 0x200a)
>> +		hdmi->connector.ycbcr_420_allowed =
>> +			hdmi->plat_data->ycbcr_420_allowed;
>> +	else
>> +		hdmi->connector.ycbcr_420_allowed = false;
>> +
> 
> The hdmi structure being allocated with kzalloc, you don't need the
> second branch of the if, but I'm fine if you prefer keeping it. Any
> either case,

Yep Andrzej said the same, but I prefer it to be explicit.

> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

Thanks,
Neil

> 
>>  	memset(&pdevinfo, 0, sizeof(pdevinfo));
>>  	pdevinfo.parent = dev;
>>  	pdevinfo.id = PLATFORM_DEVID_AUTO;
>> diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
>> index 9d4d5cc47969..0b34a12c4a1c 100644
>> --- a/include/drm/bridge/dw_hdmi.h
>> +++ b/include/drm/bridge/dw_hdmi.h
>> @@ -129,6 +129,7 @@ struct dw_hdmi_plat_data {
>>  	unsigned long input_bus_format;
>>  	unsigned long input_bus_encoding;
>>  	bool use_drm_infoframe;
>> +	bool ycbcr_420_allowed;
>>  
>>  	/* Vendor PHY support */
>>  	const struct dw_hdmi_phy_ops *phy_ops;
>