So we only write out that part of the edid blob
which has been filled with data.
Also use a larger buffer for the blob.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20210427150824.638359-1-kraxel@redhat.com
Message-Id: <20210427150824.638359-2-kraxel@redhat.com>
Not needed and makes some compilers error out with:
qemu-edid.c:15:1: error: initializer element is not constant
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20201013091615.14166-1-kraxel@redhat.com
Replace dpi with width_mm/height_mm in qemu_edid_info.
Use it when set (non-zero) to compute the DPI and generate the EDID.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20200927145751.365446-3-marcandre.lureau@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
No header includes qemu-common.h after this commit, as prescribed by
qemu-common.h's file comment.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20190523143508.25387-5-armbru@redhat.com>
[Rebased with conflicts resolved automatically, except for
include/hw/arm/xlnx-zynqmp.h hw/arm/nrf51_soc.c hw/arm/msf2-soc.c
block/qcow2-refcount.c block/qcow2-cluster.c block/qcow2-cache.c
target/arm/cpu.h target/lm32/cpu.h target/m68k/cpu.h target/mips/cpu.h
target/moxie/cpu.h target/nios2/cpu.h target/openrisc/cpu.h
target/riscv/cpu.h target/tilegx/cpu.h target/tricore/cpu.h
target/unicore32/cpu.h target/xtensa/cpu.h; bsd-user/main.c and
net/tap-bsd.c fixed up]
EDID is a metadata format to describe monitors. On physical hardware
the monitor has an eeprom with that data block which can be read over
i2c bus.
On a linux system you can usually find the EDID data block in
/sys/class/drm/$card/$connector/edid. xorg ships a edid-decode utility
which you can use to turn the blob into readable form.
I think it would be a good idea to use EDID for virtual displays too.
Needs changes in both qemu and guest kms drivers. This patch is the
first step, it adds an generator for EDID blobs to qemu. Comes with a
qemu-edid test tool included.
With EDID we can pass more information to the guest. Names and serial
numbers, so the guests display configuration has no boring "Unknown
Monitor". List of video modes. Display resolution, pretty important
in case we want add HiDPI support some day.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20180925075646.25114-2-kraxel@redhat.com
Gerd Hoffmann
Marc-André Lureau
Markus Armbruster