Do not fail on newer DPCD revision. Assume it backwards compatible.
Try to fall back to supported data rate in case display reports too
high data rate.
Signed-off-by: Andrey Gusakov <andrey.gusakov@xxxxxxxxxxxxxxxxxx>
---
drivers/video/tc358767.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
diff --git a/drivers/video/tc358767.c b/drivers/video/tc358767.c
index d652c1442..c2222d916 100644
--- a/drivers/video/tc358767.c
+++ b/drivers/video/tc358767.c
@@ -674,13 +674,25 @@ static int tc_get_display_props(struct tc_data *tc)
ret = tc_aux_read(tc, 0x000, tmp, 8);
if (ret)
goto err_dpcd_read;
- /* check rev 1.0 or 1.1 */
- if ((tmp[1] != 0x06) && (tmp[1] != 0x0a))
- goto err_dpcd_inval;
tc->assr = !(tc->rev & 0x02);
+
+ /* check DPCD rev */
+ if (tmp[0] < 0x10) {
+ dev_err(tc->dev, "Too low DPCD revision 0x%02x\n", tmp[0]);
+ goto err_dpcd_inval;
+ }
+ if ((tmp[0] != 0x10) && (tmp[0] != 0x11))
+ dev_warn(tc->dev, "Unknown DPCD revision 0x%02x\n", tmp[0]);
tc->link.rev = tmp[0];
- tc->link.rate = tmp[1];
+
+ /* check rate */
+ if ((tmp[1] == 0x06) || (tmp[1] == 0x0a)) {
+ tc->link.rate = tmp[1];
+ } else {
+ dev_warn(tc->dev, "Unknown link rate 0x%02x, falling to 2.7Gbps\n", tmp[1]);
+ tc->link.rate = 0x0a;
+ }
tc->link.lanes = tmp[2] & 0x0f;
if (tc->link.lanes > 2) {
dev_dbg(tc->dev, "Display supports %d lanes, host only 2 max. "
--
2.13.0
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