Uwe Kleine-König aaa2bf750a clk: divider: fix calculation of maximal parent rate for a given divider ...

[ Upstream commit da321133b5 ]

The rate provided at the output of a clk-divider is calculated as:

	DIV_ROUND_UP(parent_rate, div)

since commit b11d282dbe (clk: divider: fix rate calculation for
fractional rates). So to yield a rate not bigger than r parent_rate
must be <= r * div.

The effect of choosing a parent rate that is too big as was done before
this patch results in wrongly ruling out good dividers.

Note that this is not a complete fix as __clk_round_rate might return a
value >= its 2nd parameter. Also for dividers with
CLK_DIVIDER_ROUND_CLOSEST set the calculation is not accurate. But this
fixes the test case by Sascha Hauer that uses a chain of three dividers
under a fixed clock.

Fixes: b11d282dbe (clk: divider: fix rate calculation for fractional rates)
Suggested-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Michael Turquette <mturquette@linaro.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

2015-04-24 17:14:11 -04:00

..

at91

clk: at91: keep slow clk enabled to prevent system hang

2015-01-27 08:29:38 -08:00

bcm

clk: bcm/kona: implement determine_rate()

2014-05-27 17:34:32 -07:00

berlin

clk: berlin: bg2q: remove non-exist "smemc" gate clock

2015-01-27 08:29:38 -08:00

hisilicon

clk: hix5hd2: add I2C clocks

2014-09-28 10:27:09 +08:00

keystone

clk: keystone: gate: fix clk_init_data initialization

2014-02-10 15:17:43 -05:00

mmp

clk: mmp: try to use closer one when do round rate

2014-03-26 20:59:27 -07:00

mvebu

Merge tag 'clk-mvebu-3.18-2' of git://git.infradead.org/linux-mvebu into clk-next

2014-10-03 16:43:02 -07:00

mxs

ARM: mxs: remove custom .init_time hook

2013-09-29 21:09:34 +02:00

pxa

clk: pxa: fix pxa27x CCCR bit usage

2014-11-17 11:25:29 -08:00

qcom

clk: qcom: Fix duplicate rbcpr clock name

2014-11-17 10:40:42 -08:00

rockchip

clk: rockchip: fix rk3066 pll lock bit location

2015-01-27 08:29:38 -08:00

samsung

clk: samsung: Fix double add of syscore ops after driver rebind

2015-01-27 08:29:38 -08:00

shmobile

Merge tag 'clk-for-linus-3.18' of git://git.linaro.org/people/mike.turquette/linux

2014-10-15 07:05:03 +02:00

sirf

clk: sirf: update copyright years to 2014

2014-03-26 21:47:35 -07:00

socfpga

Merge tag 'socfpga-clk-update-for-v3.16' of git://git.rocketboards.org/linux-socfpga-next into clk-next-socfpga

2014-05-12 19:11:13 -07:00

spear

Merge branch 'clk-fixes' into clk-next

2014-07-13 07:56:45 -07:00

st

clk: st: Use round to closest divider flag

2014-07-28 22:37:16 -07:00

sunxi

sunxi: clk: Set sun6i-pll1 n_start = 1

2015-03-23 21:02:47 -04:00

tegra

clk: tegra: Make clock initialization more robust

2014-09-18 14:56:53 +03:00

ti

Merge branch 'for-v3.18/ti-clk-driver' of github.com:t-kristo/linux-pm into clk-next

2014-09-29 23:38:59 -07:00

ux500

clk: ux500: Staticize ux500_twocell_get

2014-02-23 15:04:40 -08:00

versatile

clk: versatile: add versatile OSC support

2014-06-24 14:21:22 -05:00

x86

ACPI / LPSS: add support for Intel BayTrail

2013-06-19 01:08:47 +02:00

zynq

clk: zynq: Force CPU_2X clock to be ungated

2015-03-23 21:02:46 -04:00

clk-axi-clkgen.c

clk: Remove .owner field for driver

2014-09-25 17:43:31 -07:00

clk-axm5516.c

clk: Add clock driver for AXM55xx SoC

2014-05-22 22:06:14 -07:00

clk-bcm2835.c

ARM: bcm2835: remove custom .init_time hook

2013-09-29 21:09:24 +02:00

clk-clps711x.c

clk: Add CLPS711X clk driver

2014-07-28 23:30:46 -07:00

clk-composite.c

clk: composite: improve rate_hw sanity check logic

2014-07-13 12:17:05 -07:00

clk-conf.c

clk: Add missing of_clk_set_defaults export

2014-08-04 09:48:39 -07:00

clk-devres.c

ARM: 7537/1: clk: Fix release in devm_clk_put()

2012-09-19 21:51:27 +01:00

clk-divider.c

clk: divider: fix calculation of maximal parent rate for a given divider

2015-04-24 17:14:11 -04:00

clk-efm32gg.c

clk/efm32gg: fix dt init prototype

2014-09-09 13:52:18 -07:00

clk-fixed-factor.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial

2013-11-15 16:47:22 -08:00

clk-fixed-rate.c

clk: add accuracy support for fixed clock

2013-12-22 23:14:28 -08:00

clk-fractional-divider.c

clk: fractional-divider: cast parent_rate to u64 before multiplying

2014-09-10 09:42:37 -07:00

clk-gate.c

clk-gate: fix bit # check in clk_register_gate()

2015-03-23 21:02:54 -04:00

clk-gpio-gate.c

clk: gpio-gate: Ensure gpiod_ APIs are prototyped

2014-09-30 11:57:54 -07:00

clk-highbank.c

ARM: highbank: remove custom .init_time hook

2013-09-29 21:09:29 +02:00

clk-ls1x.c

clk: add Loongson1B clock support

2012-08-31 11:05:18 -07:00

clk-max77686.c

clk: Remove .owner field for driver

2014-09-25 17:43:31 -07:00

clk-max77802.c

clk: Remove .owner field for driver

2014-09-25 17:43:31 -07:00

clk-max-gen.c

clk: Add generic driver for Maxim PMIC clocks

2014-09-09 13:55:44 -07:00

clk-max-gen.h

clk: Add generic driver for Maxim PMIC clocks

2014-09-09 13:55:44 -07:00

clk-moxart.c

clk: add MOXA ART SoCs clock driver

2014-03-18 17:13:14 -07:00

clk-mux.c

clk: wrap I/O access for improved portability

2013-08-27 17:50:38 -07:00

clk-nomadik.c

clk: nomadik: fix multiplatform problem

2014-02-26 11:14:44 -08:00

clk-nspire.c

clk: Add TI-Nspire clock drivers

2013-05-31 12:07:45 -07:00

clk-palmas.c

clk: Remove .owner field for driver

2014-09-25 17:43:31 -07:00

clk-ppc-corenet.c

Revert "clk: ppc-corenet: Fix Section mismatch warning"

2015-01-27 08:29:38 -08:00

clk-rk808.c

clk: RK808: add clkout driver for RK808

2014-10-14 02:18:18 +02:00

clk-s2mps11.c

Merge branch 'clk-fixes' into clk-next

2014-07-03 11:55:42 -07:00

clk-si570.c

clk: si570: Fix email address specifiction

2014-05-20 16:18:18 +02:00

clk-si5351.c

Merge tag 'clk-for-linus-3.14-part2' of git://git.linaro.org/people/mike.turquette/linux

2014-01-28 18:44:53 -08:00

clk-si5351.h

clk: si5351: remove variant from platform_data

2014-01-27 11:20:22 -08:00

clk-twl6040.c

clk: Remove .owner field for driver

2014-09-25 17:43:31 -07:00

clk-u300.c

clk: u300: Terminate of match table

2014-05-27 18:29:04 -07:00

clk-vt8500.c

clk: vt8500: Staticize vtwm_pll_ops

2013-12-19 17:47:32 -08:00

clk-wm831x.c

clk: Remove .owner field for driver

2014-09-25 17:43:31 -07:00

clk-xgene.c

clk: Add APM X-Gene SoC clock driver

2013-10-07 11:22:15 -07:00

clk.c

clk: Fix debugfs clk removal before inited

2015-03-23 21:02:46 -04:00

clk.h

clk: Add of_clk_get_by_clkspec() helper

2014-05-22 15:54:59 -07:00

clkdev.c

clkdev: Don't print errors on probe defer

2014-06-26 12:55:03 -07:00

Kconfig

Merge tag 'clk-for-linus-3.18' of git://git.linaro.org/people/mike.turquette/linux

2014-10-15 07:05:03 +02:00

Makefile

Merge tag 'clk-for-linus-3.18' of git://git.linaro.org/people/mike.turquette/linux

2014-10-15 07:05:03 +02:00