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

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>

diff --git a/drivers/gpu/drm/bridge/lontium-lt9211.c b/drivers/gpu/drm/bridge/lontium-lt9211.c
index 399fa7eebd49cc3fe9e812517fc3e8ed25004086..03fc8fd10f20aa486ac6869e816a1e0f11f05d8b 100644 (file)
--- a/drivers/gpu/drm/bridge/lontium-lt9211.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9211.c
@@ -121,8 +121,7 @@ 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;