[PATCH 4/6] xen: Sync up with the canonical protocol definition in Xen

[Jürgen Groß]

On 31.07.20 14:51, Oleksandr Andrushchenko wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko at epam.com>
> 
> This is the sync up with the canonical definition of the
> display protocol in Xen.
> 
> 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.
> 
> 3. Add XENDISPL_OP_GET_EDID command
> 
> 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 at epam.com>

Reviewed-by: Juergen Gross <jgross at suse.com>


Juergen