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Re: [PATCH v2] xen/displif: Protocol version 2

On 02.07.20 09:59, Oleksandr Andrushchenko wrote:

On 7/2/20 10:20 AM, Jürgen Groß wrote:
On 01.07.20 14:07, Oleksandr Andrushchenko wrote:
On 7/1/20 1:46 PM, Jürgen Groß wrote:
On 01.07.20 09:19, Oleksandr Andrushchenko wrote:
From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>

1. Add protocol version as an integer

Version string, which is in fact an integer, is hard to handle in the
code that supports different protocol versions. To simplify that
also add the version as an integer.

2. Pass buffer offset with XENDISPL_OP_DBUF_CREATE

There are cases when display data buffer is created with non-zero
offset to the data start. Handle such cases and provide that offset
while creating a display buffer.


Add an optional request for reading Extended Display Identification
Data (EDID) structure which allows better configuration of the
display connectors over the configuration set in XenStore.
With this change connectors may have multiple resolutions defined
with respect to detailed timing definitions and additional properties
normally provided by displays.

If this request is not supported by the backend then visible area
is defined by the relevant XenStore's "resolution" property.

If backend provides extended display identification data (EDID) with
XENDISPL_OP_GET_EDID request then EDID values must take precedence
over the resolutions defined in XenStore.

4. Bump protocol version to 2.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>

Reviewed-by: Juergen Gross <jgross@xxxxxxxx>

Thank you, do you want me to prepare the same for the kernel so

you have it at hand when the time comes?

It should be added to the kernel only when really needed (i.e. a user of
the new functionality is showing up).

We have a patch for that which adds EDID to the existing PV DRM frontend,

so while upstreaming those changes I will also include changes to the protocol

in the kernel series: for that we need the header in Xen tree first, right?





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