This is a note to let you know that I've just added the patch titled
drm/tidss: Check for K2G in in dispc_softreset()
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-tidss-check-for-k2g-in-in-dispc_softreset.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2c0015f295fe3aedf551b4ad9c13d4d4fb570813
Author: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Date: Thu Nov 9 09:37:59 2023 +0200
drm/tidss: Check for K2G in in dispc_softreset()
[ Upstream commit 151825150cf9c2e9fb90763d35b9dff3783628ac ]
K2G doesn't have softreset feature. Instead of having every caller of
dispc_softreset() check for K2G, move the check into dispc_softreset(),
and make dispc_softreset() return 0 in case of K2G.
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Reviewed-by: Aradhya Bhatia <a-bhatia1@xxxxxx>
Link: https://lore.kernel.org/r/20231109-tidss-probe-v2-6-ac91b5ea35c0@xxxxxxxxxxxxxxxx
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Stable-dep-of: bc288a927815 ("drm/tidss: Fix dss reset")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c
index 9a29f5fa8453..2af623842cfb 100644
--- a/drivers/gpu/drm/tidss/tidss_dispc.c
+++ b/drivers/gpu/drm/tidss/tidss_dispc.c
@@ -2707,6 +2707,10 @@ static int dispc_softreset(struct dispc_device *dispc)
u32 val;
int ret = 0;
+ /* K2G display controller does not support soft reset */
+ if (dispc->feat->subrev == DISPC_K2G)
+ return 0;
+
/* Soft reset */
REG_FLD_MOD(dispc, DSS_SYSCONFIG, 1, 1, 1);
/* Wait for reset to complete */
@@ -2829,12 +2833,9 @@ int dispc_init(struct tidss_device *tidss)
of_property_read_u32(dispc->dev->of_node, "max-memory-bandwidth",
&dispc->memory_bandwidth_limit);
- /* K2G display controller does not support soft reset */
- if (feat->subrev != DISPC_K2G) {
- r = dispc_softreset(dispc);
- if (r)
- return r;
- }
+ r = dispc_softreset(dispc);
+ if (r)
+ return r;
tidss->dispc = dispc;
