[PATCH v2 3/3] mgag200: Warn once if trying to set start address on broken hardware.

[Jocelyn Falempe]

Some MGA200 hardware are broken, and can't use a start address > 0

v2: Warn if startaddr is not 0, and hw doesn't support it.
  (instead of removing MGAG200_FLAG_HW_BUG_NO_STARTADD)

Signed-off-by: Jocelyn Falempe <jfalempe at redhat.com>
---
 drivers/gpu/drm/mgag200/mgag200_mode.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 2bc380a85996..d2cf26b3cee0 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -223,6 +223,9 @@ static void mgag200_set_startadd(struct mga_device *mdev,
 
 	startadd = offset / 8;
 
+	if (startadd > 0)
+		drm_WARN_ON_ONCE(dev, mdev->flags & MGAG200_FLAG_HW_BUG_NO_STARTADD);
+
 	/*
 	 * Can't store addresses any higher than that, but we also
 	 * don't have more than 16 MiB of memory, so it should be fine.
-- 
2.35.1