From: Peng Fan <peng.fan@nxp.com>
To: Francesco Dolcini <francesco@dolcini.it>,
"Peng Fan (OSS)" <peng.fan@oss.nxp.com>
Cc: Abel Vesa <abelvesa@kernel.org>,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
Fabio Estevam <festevam@gmail.com>, Jacky Bai <ping.bai@nxp.com>,
Ye Li <ye.li@nxp.com>, Aisheng Dong <aisheng.dong@nxp.com>,
"linux-clk@vger.kernel.org" <linux-clk@vger.kernel.org>,
"imx@lists.linux.dev" <imx@lists.linux.dev>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Abel Vesa <abel.vesa@linaro.org>
Subject: RE: [PATCH 10/18] clk: imx: Remove CLK_SET_PARENT_GATE for DRAM mux for i.MX7D
Date: Sat, 4 May 2024 13:15:02 +0000 [thread overview]
Message-ID: <DU0PR04MB9417404E8E89CB82386146B6881E2@DU0PR04MB9417.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <20240504120124.GC3666@francesco-nb>
> Subject: Re: [PATCH 10/18] clk: imx: Remove CLK_SET_PARENT_GATE for
> DRAM mux for i.MX7D
>
> Hello Peng,
>
> On Sat, May 04, 2024 at 08:49:03AM +0800, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@nxp.com>
> >
> > For i.MX7D DRAM related mux clock, the clock source change should ONLY
> > be done done in low level asm code without accessing DRAM, and then
> > calling clk API to sync the HW clock status with clk tree, it should
> > never touch real clock source switch via clk API, so
> > CLK_SET_PARENT_GATE flag should NOT be added, otherwise, DRAM's clock
> > parent will be disabled when DRAM is active, and system will hang.
>
> From the description this is solving a system hang, but no fixes tag nor cc
> stable.
Not add fixes tab, because current upstream kernel not support DRAM freq
update for 7D, so the issue will not happen in upstream kernel. But in case
in future DRAM freq change needs change..
>
> Francesco
next prev parent reply other threads:[~2024-05-04 13:15 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-04 0:48 [PATCH 00/18] clk: imx: misc update/fix Peng Fan (OSS)
2024-05-04 0:48 ` [PATCH 01/18] clk: imx: composite-8m: Enable gate clk with mcore_booted Peng Fan (OSS)
2024-05-04 0:48 ` [PATCH 02/18] clk: imx: composite-93: keep root clock on when mcore enabled Peng Fan (OSS)
2024-05-04 0:48 ` [PATCH 03/18] clk: imx: composite-7ulp: Check the PCC present bit Peng Fan (OSS)
2024-05-04 0:48 ` [PATCH 04/18] clk: imx: fracn-gppll: fix fractional part of PLL getting lost Peng Fan (OSS)
2024-05-04 0:48 ` [PATCH 05/18] clk: imx: pll14xx: Add constraint for fvco frequency Peng Fan (OSS)
2024-05-04 0:48 ` [PATCH 06/18] clk: imx: pll14xx: use rate_table for audio plls Peng Fan (OSS)
2024-05-16 12:18 ` Adam Ford
2024-05-04 0:49 ` [PATCH 07/18] clk: imx: pll14xx: potential integer overflow eliminated by casting to u64 Peng Fan (OSS)
2024-05-04 11:58 ` Francesco Dolcini
2024-05-04 13:13 ` Peng Fan
2024-05-04 0:49 ` [PATCH 08/18] clk: imx: imx8mp-audiomix: remove sdma root clock Peng Fan (OSS)
2024-05-04 11:59 ` Francesco Dolcini
2024-05-04 13:15 ` Peng Fan
2024-05-04 0:49 ` [PATCH 09/18] clk: imx: imx8mp: fix clock tree update of TF-A managed clocks Peng Fan (OSS)
2024-05-04 0:49 ` [PATCH 10/18] clk: imx: Remove CLK_SET_PARENT_GATE for DRAM mux for i.MX7D Peng Fan (OSS)
2024-05-04 12:01 ` Francesco Dolcini
2024-05-04 13:15 ` Peng Fan [this message]
2024-05-04 0:49 ` [PATCH 11/18] clk: imx: add CLK_SET_RATE_PARENT for lcdif_pixel_src " Peng Fan (OSS)
2024-05-04 0:49 ` [PATCH 12/18] clk: imx: imx8mn: add sai7_ipg_clk clock settings Peng Fan (OSS)
2024-05-04 0:49 ` [PATCH 13/18] clk: imx: imx8mm: Change the 'nand_usdhc_bus' clock to non-critical one Peng Fan (OSS)
2024-05-04 0:49 ` [PATCH 14/18] clk: imx: imx8qxp: Add LVDS bypass clocks Peng Fan (OSS)
2024-05-04 0:49 ` [PATCH 15/18] clk: imx: imx8qxp: Add clock muxes for MIPI and PHY ref clocks Peng Fan (OSS)
2024-05-04 0:49 ` [PATCH 16/18] clk: imx: imx8qxp: Register dc0_bypass0_clk before disp clk Peng Fan (OSS)
2024-05-04 0:49 ` [PATCH 17/18] clk: imx: imx8qxp: Parent should be initialized earlier than the clock Peng Fan (OSS)
2024-05-04 0:49 ` [PATCH 18/18] clk: imx: fracn-gppll: update rate table Peng Fan (OSS)
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=DU0PR04MB9417404E8E89CB82386146B6881E2@DU0PR04MB9417.eurprd04.prod.outlook.com \
--to=peng.fan@nxp.com \
--cc=abel.vesa@linaro.org \
--cc=abelvesa@kernel.org \
--cc=aisheng.dong@nxp.com \
--cc=festevam@gmail.com \
--cc=francesco@dolcini.it \
--cc=imx@lists.linux.dev \
--cc=kernel@pengutronix.de \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-clk@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mturquette@baylibre.com \
--cc=peng.fan@oss.nxp.com \
--cc=ping.bai@nxp.com \
--cc=s.hauer@pengutronix.de \
--cc=sboyd@kernel.org \
--cc=shawnguo@kernel.org \
--cc=ye.li@nxp.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).