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 53A221C29 for ; Wed, 23 Nov 2022 09:32:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 94955C433D6; Wed, 23 Nov 2022 09:32:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1669195971; bh=6TDrox1pFcyPxL42kEX1fUpLGFpDOc7GVAip7FwfN6o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hlFERx4K5Jp4QbB7Txc32tPjR/4tQvdgESL6xEYR0nAE7rKGYfme0pbFYTzPkCHP9 D4Q+Xnj6WRXYeZDtGSygTWjT4JbpfziOai6Z45q2Gh8/DUV4pAnO6TqNB8kajJSi93 FEIFg/89BX+ql1A4IwBRzQBSdBKRlZ7OIp8Zo29A= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xiaolei Wang , Lucas Stach , Shawn Guo , Sasha Levin Subject: [PATCH 5.15 083/181] soc: imx8m: Enable OCOTP clock before reading the register Date: Wed, 23 Nov 2022 09:50:46 +0100 Message-Id: <20221123084605.902158314@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221123084602.707860461@linuxfoundation.org> References: <20221123084602.707860461@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: Xiaolei Wang [ Upstream commit 836fb30949d9edf91d7de696a884ceeae7e426d2 ] Commit 7d981405d0fd ("soc: imx8m: change to use platform driver") ever removed the dependency on bootloader for enabling OCOTP clock. It helped to fix a kexec kernel hang issue. But unfortunately it caused a regression on CAAM driver and got reverted. This is the second try to enable the OCOTP clock by directly calling clock API instead of indirectly enabling the clock via nvmem API. Fixes: ac34de14ac30 ("Revert "soc: imx8m: change to use platform driver"") Signed-off-by: Xiaolei Wang Reviewed-by: Lucas Stach Signed-off-by: Shawn Guo Signed-off-by: Sasha Levin --- drivers/soc/imx/soc-imx8m.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/soc/imx/soc-imx8m.c b/drivers/soc/imx/soc-imx8m.c index cc57a384d74d..28144c699b0c 100644 --- a/drivers/soc/imx/soc-imx8m.c +++ b/drivers/soc/imx/soc-imx8m.c @@ -11,6 +11,7 @@ #include #include #include +#include #define REV_B1 0x21 @@ -56,6 +57,7 @@ static u32 __init imx8mq_soc_revision(void) void __iomem *ocotp_base; u32 magic; u32 rev; + struct clk *clk; np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-ocotp"); if (!np) @@ -63,6 +65,13 @@ static u32 __init imx8mq_soc_revision(void) ocotp_base = of_iomap(np, 0); WARN_ON(!ocotp_base); + clk = of_clk_get_by_name(np, NULL); + if (!clk) { + WARN_ON(!clk); + return 0; + } + + clk_prepare_enable(clk); /* * SOC revision on older imx8mq is not available in fuses so query @@ -79,6 +88,8 @@ static u32 __init imx8mq_soc_revision(void) soc_uid <<= 32; soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW); + clk_disable_unprepare(clk); + clk_put(clk); iounmap(ocotp_base); of_node_put(np); -- 2.35.1