Douglas Anderson 1e2d08a837 clk: rockchip: Slightly more accurate math in rockchip_mmc_get_phase() ... There's a bit of math in rockchip_mmc_get_phase() to calculate the "fine delay". This math boils down to: PSECS_PER_SEC = 1000000000000. ROCKCHIP_MMC_DELAY_ELEMENT_PSEC = 60 card_clk * ROCKCHIP_MMC_DELAY_ELEMENT_PSEC * 360 * x / PSECS_PER_SEC ...but we do it in pieces to avoid overflowing 32-bits. Right now we overdo it a little bit, though, and end up getting less accurate math than we could. Right now we do: DIV_ROUND_CLOSEST((card_clk / 1000000) * (ROCKCHIP_MMC_DELAY_ELEMENT_PSEC / 10) * (360 / 10) * delay_num, PSECS_PER_SEC / 1000000 / 10 / 10) This is non-ideal because: A) The pins on Rockchip SoCs are rated to go at most 150 MHz, so the max card clock is 150 MHz. Even ignoring this the maximum SD card clock (for SDR104) would be 208 MHz. This means you can decrease your division by 100x and still not overflow: hex(208000000 / 10000 * 6 * 36 * 0xff) == 0x44497200 B) On many Rockchip SoCs we end up with a card clock that is actually 148500000 because we parent off the 297 MHz PLL. That means the math we're actually doing today is less than ideal. Specifically: 148500000 / 1000000 = 148 Let's fix the math to be slightly more accurate. NOTE: no known problems are fixed by this. It was found simply by code inspection. If you want to see the difference between the old and the new on a 148.5 MHz clock, this python can help: old = [x for x in (int(round(148 * 6 * 36 * x / 10000.)) for x in range(256)) if x < 90] new = [x for x in (int(round(1485 * 6 * 36 * x / 100000.)) for x in range(256)) if x < 90] The only differences are: delay_num=17 54=>55 delay_num=22 70=>71 delay_num=27 86=>87 Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Heiko Stuebner <heiko@sntech.de>		2019-05-20 01:00:53 +02:00
..
actions	clk: actions: Use the correct style for SPDX License Identifier	2019-05-01 13:01:07 -07:00
analogbits	clk: analogbits: add Wide-Range PLL library	2019-05-03 09:20:48 -07:00
at91	Merge branches 'clk-stm32f4', 'clk-tegra', 'clk-at91', 'clk-sifive-fu540' and 'clk-spdx' into clk-next	2019-05-07 11:45:29 -07:00
axis
axs10x	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
bcm	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
berlin	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
davinci	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
h8300	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
hisilicon	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
imgtec	clk: boston: unregister clks on failure in clk_boston_setup()	2018-11-08 10:14:41 -08:00
imx	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
ingenic	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
keystone	Merge branch 'clk-k3-tisci' into clk-next	2018-10-18 15:40:10 -07:00
loongson1	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
mediatek	Merge branches 'clk-renesas', 'clk-qcom', 'clk-mtk', 'clk-milbeaut' and 'clk-imx' into clk-next	2019-05-07 11:44:21 -07:00
meson	Merge branches 'clk-doc', 'clk-more-critical', 'clk-meson' and 'clk-basic-be' into clk-next	2019-05-07 11:44:42 -07:00
microchip	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
mmp	clk: Remove CLK_IS_BASIC clk flag	2019-04-26 10:40:49 -07:00
mvebu	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
mxs
nxp	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
pistachio	clk: pistachio: constify clk_ops structures	2018-11-06 09:41:49 -08:00
pxa	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
qcom	Merge branches 'clk-stm32f4', 'clk-tegra', 'clk-at91', 'clk-sifive-fu540' and 'clk-spdx' into clk-next	2019-05-07 11:45:29 -07:00
renesas	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
rockchip	clk: rockchip: Slightly more accurate math in rockchip_mmc_get_phase()	2019-05-20 01:00:53 +02:00
samsung	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
sifive	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
sirf
socfpga	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
spear	clk: spear: fix WDT clock definition on SPEAr600	2018-04-06 13:45:34 -07:00
sprd	clk: sprd: Use the correct style for SPDX License Identifier	2019-05-01 13:01:23 -07:00
st	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
sunxi	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
sunxi-ng	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
tegra	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
ti	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
uniphier	clk: uniphier: Fix update register for CPU-gear	2019-02-21 13:50:23 -08:00
ux500	clk: ux500: add range to usleep_range	2019-04-11 11:47:50 -07:00
versatile	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
x86	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
zte
zynq	clk: core: replace clk_{readl,writel} with {readl,writel}	2019-04-23 10:57:49 -07:00
zynqmp	ARM: SoC-related driver updates	2019-05-16 09:19:14 -07:00
clk-asm9260.c	clk: Convert to using %pOFn instead of device_node.name	2018-08-30 09:50:20 -07:00
clk-aspeed.c	clk: Aspeed: Setup video engine clocking	2019-04-18 14:56:19 -07:00
clk-axi-clkgen.c
clk-axm5516.c	clk: axm5516: Remove usage of CLK_IS_BASIC	2018-12-10 14:43:21 -08:00
clk-bd718x7.c	clk: bd718x7: Initial support for ROHM bd71837/bd71847 PMIC clock	2018-12-10 12:44:03 -08:00
clk-bulk.c	clk: Tag clk core files with SPDX	2018-12-11 09:57:47 -08:00
clk-cdce706.c
clk-cdce925.c	Merge branches 'clk-dt-name', 'clk-ti-of-node' and 'clk-sa' into clk-next	2018-10-18 15:33:52 -07:00
clk-clps711x.c	clk: clps711x: Remove board support	2019-01-09 12:50:21 -08:00
clk-composite.c	clk: Remove CLK_IS_BASIC clk flag	2019-04-26 10:40:49 -07:00
clk-conf.c	clk: Tag clk core files with SPDX	2018-12-11 09:57:47 -08:00
clk-cs2000-cp.c	clk: cs2000-cp: convert to SPDX identifiers	2018-08-02 13:55:00 -07:00
clk-devres.c	clk: Add (devm_)clk_get_optional() functions	2019-02-06 10:33:10 -08:00
clk-divider.c	Merge branch 'clk-ti' into clk-next	2019-05-07 11:46:02 -07:00
clk-efm32gg.c	treewide: Use struct_size() for kmalloc()-family	2018-06-06 11:15:43 -07:00
clk-fixed-factor.c	Merge branch 'clk-parent-rewrite-1' into clk-next	2019-05-07 11:46:13 -07:00
clk-fixed-mmio.c	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
clk-fixed-rate.c	clk: Remove CLK_IS_BASIC clk flag	2019-04-26 10:40:49 -07:00
clk-fractional-divider.c	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
clk-gate.c	Merge branch 'clk-ti' into clk-next	2019-05-07 11:46:02 -07:00
clk-gemini.c	treewide: Use struct_size() for kmalloc()-family	2018-06-06 11:15:43 -07:00
clk-gpio.c	clk: Remove CLK_IS_BASIC clk flag	2019-04-26 10:40:49 -07:00
clk-hi655x.c	clk: clk-hi655x: Free of_provider at remove	2018-12-05 09:20:29 -08:00
clk-highbank.c	Merge branches 'clk-doc', 'clk-more-critical', 'clk-meson' and 'clk-basic-be' into clk-next	2019-05-07 11:44:42 -07:00
clk-hsdk-pll.c	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
clk-lochnagar.c	clk: lochnagar: Add support for the Cirrus Logic Lochnagar	2019-04-23 14:59:38 -07:00
clk-max9485.c	clk: Add driver for MAX9485	2018-07-06 13:44:06 -07:00
clk-max77686.c	clk: clk-max77686: Clean clkdev lookup leak and use devm	2019-02-06 10:35:03 -08:00
clk-milbeaut.c	clock: milbeaut: Add Milbeaut M10V clock controller	2019-04-25 16:43:37 -07:00
clk-moxart.c
clk-multiplier.c	clk: Remove io.h from clk-provider.h	2019-05-15 13:21:37 -07:00
clk-mux.c	Merge branch 'clk-ti' into clk-next	2019-05-07 11:46:02 -07:00
clk-nomadik.c	clk: nomadik: Change to use DEFINE_SHOW_ATTRIBUTE macro	2018-11-28 14:13:18 -08:00
clk-npcm7xx.c	This time it looks like a quieter release cycle in the clk tree. I guess that's	2018-10-31 11:08:30 -07:00
clk-nspire.c
clk-oxnas.c
clk-palmas.c	clk: palmas: constify clk_ops structure	2018-11-06 09:41:44 -08:00
clk-pwm.c	clk: Remove CLK_IS_BASIC clk flag	2019-04-26 10:40:49 -07:00
clk-qoriq.c	clk: qoriq: increase array size of cmux_to_group	2019-04-25 11:41:18 -07:00
clk-rk808.c	clk: rk808: use managed version of of_provider registration	2018-12-05 09:20:35 -08:00
clk-s2mps11.c	clk: s2mps11: constify clk_ops structure	2018-11-06 09:42:12 -08:00
clk-scmi.c	clk: Convert to using %pOFn instead of device_node.name	2018-08-30 09:50:20 -07:00
clk-scpi.c	clk: Convert to using %pOFn instead of device_node.name	2018-08-30 09:50:20 -07:00
clk-si514.c	clk-si514, clk-si544: Implement prepare/unprepare/is_prepared operations	2018-06-29 10:59:40 -07:00
clk-si544.c	clk-si514, clk-si544: Implement prepare/unprepare/is_prepared operations	2018-06-29 10:59:40 -07:00
clk-si570.c
clk-si5351.c	clk: Convert to using %pOFn instead of device_node.name	2018-08-30 09:50:20 -07:00
clk-si5351.h
clk-stm32f4.c	clk: stm32: Introduce clocks of STM32F769 board	2019-04-25 11:46:36 -07:00
clk-stm32h7.c	clk: Convert to using %pOFn instead of device_node.name	2018-08-30 09:50:20 -07:00
clk-stm32mp1.c	clk: stm32mp1: Add ddrperfm clock	2019-04-29 11:13:23 -07:00
clk-tango4.c	clk: Convert to using %pOFn instead of device_node.name	2018-08-30 09:50:20 -07:00
clk-twl6040.c	clk: clk-twl6040: Fix imprecise external abort for pdmclk	2019-02-21 14:11:23 -08:00
clk-u300.c
clk-versaclock5.c	clk: vc5: Abort clock configuration without upstream clock	2019-01-09 10:53:58 -08:00
clk-vt8500.c
clk-wm831x.c
clk-xgene.c	clk: core: replace clk_{readl,writel} with {readl,writel}	2019-04-23 10:57:49 -07:00
clk.c	Merge branch 'clk-parent-rewrite-1' into clk-next	2019-05-07 11:46:13 -07:00
clk.h	clk: Look for parents with clkdev based clk_lookups	2019-04-19 14:53:00 -07:00
clkdev.c	clk: Look for parents with clkdev based clk_lookups	2019-04-19 14:53:00 -07:00
Kconfig	Merge branches 'clk-stm32f4', 'clk-tegra', 'clk-at91', 'clk-sifive-fu540' and 'clk-spdx' into clk-next	2019-05-07 11:45:29 -07:00
Makefile	Merge branches 'clk-stm32f4', 'clk-tegra', 'clk-at91', 'clk-sifive-fu540' and 'clk-spdx' into clk-next	2019-05-07 11:45:29 -07:00