linux-kernel - RE: [PATCH v3] video: hyperv: hyperv_fb: Obtain screen resolution from Hyper-V host

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Date:   Tue, 27 Aug 2019 23:56:42 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     Wei Hu <weh@...rosoft.com>,
        "b.zolnierkie@...sung.com" <b.zolnierkie@...sung.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "sashal@...nel.org" <sashal@...nel.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>
CC:     Iouri Tarassov <iourit@...rosoft.com>
Subject: RE: [PATCH v3] video: hyperv: hyperv_fb: Obtain screen resolution
 from Hyper-V host

From: Wei Hu <weh@...rosoft.com> Sent: Tuesday, August 27, 2019 4:09 AM
> 
> Beginning from Windows 10 RS5+, VM screen resolution is obtained from host.
> The "video=hyperv_fb" boot time option is not needed, but still can be
> used to overwrite what the host specifies. The VM resolution on the host
> could be set by executing the powershell "set-vmvideo" command.
> 
> v2:
> - Implemented fallback when version negotiation failed.
> - Defined full size for supported_resolution array.
> 
> v3:
> - Corrected the synthvid major and minor version comparison problem.

The changelog for v2 and v3 should actually go after the "---" below so
that the changelog does not end up as part of the commit message.  Take
a look at other postings to LKML for an example.

> 
> Signed-off-by: Iouri Tarassov <iourit@...rosoft.com>
> Signed-off-by: Wei Hu <weh@...rosoft.com>
> ---
>  drivers/video/fbdev/hyperv_fb.c | 159 +++++++++++++++++++++++++++++---
>  1 file changed, 147 insertions(+), 12 deletions(-)
> 
> 
> +/* Check if the ver1 version is equal or greater than ver2 */
> +static inline bool synthvid_ver_eg(u32 ver1, u32 ver2)

I'm being picky here, but I would call this synthvid_ver_ge().   In my
experience "ge" is the shorthand for "greater than or equal", rather
than the "eg" you have used.

Michael


> +{
> +	if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) ||
> +	    (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) &&
> +	     SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2)))
> +		return true;
> +
> +	return false;
> +}