drm/bridge: lt9211: Drop check for last nibble of version register

[ Upstream commit db74b04edce1bc86b9a5acc724c7ca06f427ab60 ]

There is now a new LT9211 rev. U5, which reports chip ID 0x18 0x01 0xe4 .
The previous LT9211 reported chip ID 0x18 0x01 0xe3 , which is what the
driver checks for right now. Since there is a possibility there will be
yet another revision of the LT9211 in the future, drop the last version
nibble check to allow all future revisions of the chip to work with this
driver.

This fix makes LT9211 rev. U5 work with this driver.

Fixes: 8ce4129e3de4 ("drm/bridge: lt9211: Add Lontium LT9211 bridge driver")
Signed-off-by: Marek Vasut <marek.vasut@mailbox.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20251011110017.12521-1-marek.vasut@mailbox.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/bridge/lontium-lt9211.c b/drivers/gpu/drm/bridge/lontium-lt9211.c
index c8881796fba4c6a4dddebd2a266a0c3c30825e0b..4014375f06ea138e9709606b3f65c3d61f8e3209 100644 (file)
--- a/drivers/gpu/drm/bridge/lontium-lt9211.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9211.c
@@ -120,8 +120,7 @@ static int lt9211_read_chipid(struct lt9211 *ctx)
        }
 
        /* Test for known Chip ID. */
-       if (chipid[0] != REG_CHIPID0_VALUE || chipid[1] != REG_CHIPID1_VALUE ||
-           chipid[2] != REG_CHIPID2_VALUE) {
+       if (chipid[0] != REG_CHIPID0_VALUE || chipid[1] != REG_CHIPID1_VALUE) {
                dev_err(ctx->dev, "Unknown Chip ID: 0x%02x 0x%02x 0x%02x\n",
                        chipid[0], chipid[1], chipid[2]);
                return -EINVAL;