From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: pza@pengutronix.de
Subject: [PATCH v2 0/5] clk: imx6: work around LDB hang caused by ERR009219
Date: Tue, 21 May 2019 17:56:21 +0200 [thread overview]
Message-ID: <20190521155626.9906-1-a.fatoum@pengutronix.de> (raw)
Short version:
barebox always reparents the ldb_di[01] clocks to pll5_video_div.
Due to a hardware erratum, this can trigger a glitch that causes
LDB lock up.
Thus:
1) remove the automatic reparenting, like the kernel now does and
mark the affected clocks read only, so assigned-clock-parents
can't affect them
2) parse assigned-clock-parents in the clk-imx6 code as well, but
there use a convoluted non-glitchy work around to apply them
Long version available alongside v1 here:
https://www.spinics.net/lists/u-boot-v2/msg37658.html;
and in the commit messages of the patches.
Changes since v2:
- reordered/squashed commits after discussion with Sascha and Phillip
- removed superfluous comment
- add MUX_READ_ONLY at the correct place in the MUX_READ_ONLY arguments
Except for the last two, the total diff, is exactly the same
as v1's.
Ahmad Fatoum (2):
clk: imx6: remove quirky clk_set_parent(LDB_diN_sel, pll5_video_div)
clk: imx6: define an enum for ldb mux inputs
Fabio Estevam (1):
clk: imx6: Fix procedure to switch the parent of LDB_DI_CLK
Philipp Zabel (2):
clk: imx6: Make the LDB_DI0 and LDB_DI1 clocks read-only
clk: imx6: Mask mmdc_ch1 handshake for periph2_sel and
mmdc_ch1_axi_podf
drivers/clk/imx/clk-imx6.c | 320 +++++++++++++++++++++++++++++++++++--
drivers/clk/imx/clk.h | 8 +
2 files changed, 312 insertions(+), 16 deletions(-)
--
2.20.1
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next reply other threads:[~2019-05-21 15:56 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-21 15:56 Ahmad Fatoum [this message]
2019-05-21 15:56 ` [PATCH v2 1/5] clk: imx6: remove quirky clk_set_parent(LDB_diN_sel, pll5_video_div) Ahmad Fatoum
2019-05-23 10:01 ` Philipp Zabel
2019-05-23 10:28 ` Ahmad Fatoum
2019-05-26 21:55 ` Andrey Smirnov
2019-05-27 6:29 ` Ahmad Fatoum
2019-05-27 6:50 ` Andrey Smirnov
2019-05-27 7:23 ` Ahmad Fatoum
2019-05-27 7:28 ` Andrey Smirnov
2019-05-27 7:49 ` Ahmad Fatoum
2019-05-27 8:02 ` Andrey Smirnov
2019-05-27 9:19 ` Ahmad Fatoum
2019-05-27 7:25 ` Andrey Smirnov
2019-05-27 7:39 ` Ahmad Fatoum
2019-05-21 15:56 ` [PATCH v2 2/5] clk: imx6: Make the LDB_DI0 and LDB_DI1 clocks read-only Ahmad Fatoum
2019-05-23 10:01 ` Philipp Zabel
2019-05-27 7:01 ` Andrey Smirnov
2019-05-27 7:38 ` Ahmad Fatoum
2019-05-21 15:56 ` [PATCH v2 3/5] clk: imx6: Mask mmdc_ch1 handshake for periph2_sel and mmdc_ch1_axi_podf Ahmad Fatoum
2019-05-23 10:01 ` Philipp Zabel
2019-05-21 15:56 ` [PATCH v2 4/5] clk: imx6: Fix procedure to switch the parent of LDB_DI_CLK Ahmad Fatoum
2019-05-23 10:03 ` Philipp Zabel
2019-05-26 21:58 ` Andrey Smirnov
2019-05-27 7:04 ` Andrey Smirnov
2019-05-21 15:56 ` [PATCH v2 5/5] clk: imx6: define an enum for ldb mux inputs Ahmad Fatoum
2019-05-23 10:03 ` Philipp Zabel
2019-05-23 10:35 ` Ahmad Fatoum
2019-05-26 21:59 ` [PATCH v2 0/5] clk: imx6: work around LDB hang caused by ERR009219 Andrey Smirnov
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