Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 92db7f6c authored by Rafał Miłecki's avatar Rafał Miłecki Committed by Dave Airlie
Browse files

drm/radeon/kms: workaround invalid AVI infoframe checksum issue 



This change was verified to fix both issues with no video I've
investigated. I've also checked checksum calculation with fglrx on:
RV620, HD54xx, HD5450, HD6310, HD6320.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarRafał Miłecki <zajec5@gmail.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent f83d926a

drivers/gpu/drm/radeon/r600_hdmi.c

+7 −0
Original line number Diff line number Diff line
@@ -196,6 +196,13 @@ static void r600_hdmi_videoinfoframe( 
	frame[0xD] = (right_bar >> 8);



	r600_hdmi_infoframe_checksum(0x82, 0x02, 0x0D, frame);

	/* Our header values (type, version, length) should be alright, Intel

	 * is using the same. Checksum function also seems to be OK, it works

	 * fine for audio infoframe. However calculated value is always lower

	 * by 2 in comparison to fglrx. It breaks displaying anything in case

	 * of TVs that strictly check the checksum. Hack it manually here to

	 * workaround this issue. */

	frame[0x0] += 2;



	WREG32(offset+R600_HDMI_VIDEOINFOFRAME_0,

		frame[0x0] | (frame[0x1] << 8) | (frame[0x2] << 16) | (frame[0x3] << 24));