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Received: from AM7PR04MB7046.eurprd04.prod.outlook.com (2603:10a6:20b:113::22) by VI0PR04MB10757.eurprd04.prod.outlook.com (2603:10a6:800:26a::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8511.26; Mon, 10 Mar 2025 07:12:37 +0000 Received: from AM7PR04MB7046.eurprd04.prod.outlook.com ([fe80::d1ce:ea15:6648:6f90]) by AM7PR04MB7046.eurprd04.prod.outlook.com ([fe80::d1ce:ea15:6648:6f90%4]) with mapi id 15.20.8511.025; Mon, 10 Mar 2025 07:12:36 +0000 Message-ID: <47b0e1a1-1333-402e-b316-efc4dd9eee50@nxp.com> Date: Mon, 10 Mar 2025 15:13:49 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] drm/bridge: fsl-ldb: make warning message more informative To: Luca Ceresoli Cc: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Thomas Petazzoni , dri-devel@lists.freedesktop.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20250306-drm-two-ldb-improvements-v1-0-f139d768b92c@bootlin.com> <20250306-drm-two-ldb-improvements-v1-2-f139d768b92c@bootlin.com> <20250307122212.18252ca6@booty> From: Liu Ying Content-Language: en-US In-Reply-To: <20250307122212.18252ca6@booty> Content-Type: text/plain; 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Modify the >>> string to also show the clock name. >>> >>> While doing that also rewrap the entire function call. >>> >>> Signed-off-by: Luca Ceresoli >>> --- >>> drivers/gpu/drm/bridge/fsl-ldb.c | 6 +++--- >>> 1 file changed, 3 insertions(+), 3 deletions(-) >>> >>> diff --git a/drivers/gpu/drm/bridge/fsl-ldb.c b/drivers/gpu/drm/bridge/fsl-ldb.c >>> index 0fc8a14fd80062248a43b8b93272101a7ca6158a..c7c899a9644bb827845fb3fe96a9695d79a91474 100644 >>> --- a/drivers/gpu/drm/bridge/fsl-ldb.c >>> +++ b/drivers/gpu/drm/bridge/fsl-ldb.c >>> @@ -181,9 +181,9 @@ static void fsl_ldb_atomic_enable(struct drm_bridge *bridge, >>> >>> configured_link_freq = clk_get_rate(fsl_ldb->clk); >>> if (configured_link_freq != requested_link_freq) >>> - dev_warn(fsl_ldb->dev, "Configured LDB clock (%lu Hz) does not match requested LVDS clock: %lu Hz\n", >>> - configured_link_freq, >>> - requested_link_freq); >>> + dev_warn(fsl_ldb->dev, >>> + "Configured %pC clock (%lu Hz) does not match requested LVDS clock: %lu Hz\n", >>> + fsl_ldb->clk, configured_link_freq, requested_link_freq); >> >> Though this slightly changes the warning message userspace sees, I guess it is >> acceptable. >> >> Does it make sense to s/%pC/%pCn/ so that the clock name is printed in lower >> case instead of upper case, since it seems that all i.MX specific clock names >> are in lower case? > > %pC and %pCn print the same string, as I just discovered at > https://elixir.bootlin.com/linux/v6.14-rc5/source/lib/vsprintf.c#L1972 Ack. > > I've pondering for a moment about whether we should document %pC and > %pCn produce the same output or rather %pCn. I decided to try the > latter and just sent a patch to do it [0]. > > FYI in my case the printed value is (with both %pC and %pCn) > "32ec0000.blk-ctrl:bridge@5c". This is the LDB device name. The i.MX8MP LDB clock name is "media_ldb_root_clk". Acked-by: Liu Ying > > [0] https://lore.kernel.org/20250307-vsprintf-pcn-v1-0-df0b2ccf610f@bootlin.com > > Luca > -- Regards, Liu Ying