From db74b04edce1bc86b9a5acc724c7ca06f427ab60 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Sat, 11 Oct 2025 12:59:53 +0200 Subject: [PATCH] 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 Reviewed-by: Dmitry Baryshkov Link: https://lore.kernel.org/r/20251011110017.12521-1-marek.vasut@mailbox.org Signed-off-by: Dmitry Baryshkov --- drivers/gpu/drm/bridge/lontium-lt9211.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt9211.c b/drivers/gpu/drm/bridge/lontium-lt9211.c index 399fa7eebd49..03fc8fd10f20 100644 --- 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; -- 2.51.0