From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AA99F2566 for ; Tue, 18 Apr 2023 12:33:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2DAE8C433D2; Tue, 18 Apr 2023 12:33:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1681821235; bh=wzmQDfNKTv0VFuShfuXDQ3CMxFViahBXUkJvsNOXfkE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e54QG+TDjO80H1b17khcD1CftvikEI+s+lbHi8BDCUIdeGUMT5H8Pw1Wk7vdz0XQO 7WNGts59v57ttaH7nQKnqR144/WWm80dIxZ4lQaMvTGMR38l+AL0VQD+9rv8sRJzE+ BEr8gQ7gXXOPSwaxtImQ8dNGmShVB3pYT2zrL5Lw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Amit Pundir , Robert Foss Subject: [PATCH 5.10 049/124] drm/bridge: lt9611: Fix PLL being unable to lock Date: Tue, 18 Apr 2023 14:21:08 +0200 Message-Id: <20230418120311.622865442@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230418120309.539243408@linuxfoundation.org> References: <20230418120309.539243408@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Robert Foss commit 2a9df204be0bbb896e087f00b9ee3fc559d5a608 upstream. This fixes PLL being unable to lock, and is derived from an equivalent downstream commit. Available LT9611 documentation does not list this register, neither does LT9611UXC (which is a different chip). This commit has been confirmed to fix HDMI output on DragonBoard 845c. Suggested-by: Amit Pundir Reviewed-by: Amit Pundir Signed-off-by: Robert Foss Link: https://patchwork.freedesktop.org/patch/msgid/20221213150304.4189760-1-robert.foss@linaro.org Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/bridge/lontium-lt9611.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/gpu/drm/bridge/lontium-lt9611.c +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c @@ -256,6 +256,7 @@ static int lt9611_pll_setup(struct lt961 { 0x8126, 0x55 }, { 0x8127, 0x66 }, { 0x8128, 0x88 }, + { 0x812a, 0x20 }, }; regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));