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kernel_samsung_a53x/drivers/i2c/busses
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Geert Uytterhoeven c713b3266e i2c: riic: Always round-up when calculating bus period 
commit de6b43798d9043a7c749a0428dbb02d5fff156e5 upstream.

Currently, the RIIC driver may run the I2C bus faster than requested,
which may cause subtle failures.  E.g. Biju reported a measured bus
speed of 450 kHz instead of the expected maximum of 400 kHz on RZ/G2L.

The initial calculation of the bus period uses DIV_ROUND_UP(), to make
sure the actual bus speed never becomes faster than the requested bus
speed.  However, the subsequent division-by-two steps do not use
round-up, which may lead to a too-small period, hence a too-fast and
possible out-of-spec bus speed.  E.g. on RZ/Five, requesting a bus speed
of 100 resp. 400 kHz will yield too-fast target bus speeds of 100806
resp. 403226 Hz instead of 97656 resp. 390625 Hz.

Fix this by using DIV_ROUND_UP() in the subsequent divisions, too.

Tested on RZ/A1H, RZ/A2M, and RZ/Five.

Fixes: d982d66514192cdb ("i2c: riic: remove clock and frequency restrictions")
Reported-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: <stable@vger.kernel.org> # v4.15+
Link: https://lore.kernel.org/r/c59aea77998dfea1b4456c4b33b55ab216fcbf5e.1732284746.git.geert+renesas@glider.be
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-01-15 16:29:41 +01:00
..
acpm-mfd-bus.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-acorn.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-ali15x3.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-ali1535.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-ali1563.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-altera.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-amd-mp2-pci.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-amd-mp2-plat.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-amd-mp2.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-amd756-s4882.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-amd756.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-amd8111.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-aspeed.c Revert "i2c: aspeed: Update the stop sw state when the bus recovery occurs" 2024-11-24 00:23:13 +01:00
i2c-at91-core.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-at91-master.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-at91-slave.c i2c: at91: Fix the functionality flags of the slave-only interface 2024-11-19 14:19:05 +01:00
i2c-at91.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-au1550.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-axxia.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-bcm-iproc.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-bcm-kona.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-bcm2835.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-brcmstb.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-cadence.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-cbus-gpio.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-cht-wc.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-cpm.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-cros-ec-tunnel.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-davinci.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-designware-baytrail.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-designware-common.c i2c: designware: Fix corrupted memory seen in the ISR 2024-11-18 12:11:18 +01:00
i2c-designware-core.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-designware-master.c i2c: designware: Disable TX_EMPTY irq while waiting for block length byte 2024-11-18 11:43:30 +01:00
i2c-designware-pcidrv.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-designware-platdrv.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-designware-slave.c i2c: designware: Fix the functionality flags of the slave-only interface 2024-11-19 14:19:05 +01:00
i2c-digicolor.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-diolan-u2c.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-dln2.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-efm32.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-eg20t.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-elektor.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-emev2.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-exynos5.c i2c: exynos5: Silence noisy error and info logs 2024-11-17 17:45:37 +01:00
i2c-exynos5.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-fsi.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-gpio.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-highlander.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-hix5hd2.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-hydra.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-i801.c Revert "i2c: i801: Use a different adapter-name for IDF adapters" 2024-11-24 00:22:58 +01:00
i2c-ibm_iic.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-ibm_iic.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-icy.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-img-scb.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-imx-lpi2c.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-imx.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-iop3xx.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-iop3xx.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-isch.c Revert "i2c: isch: Add missed 'else'" 2024-11-24 00:23:13 +01:00
i2c-ismt.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-jz4780.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-kempld.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-lpc2k.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-meson.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-mlxbf.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-mlxcpld.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-mpc.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-mt65xx.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-mt7621.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-mv64xxx.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-mxs.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-nforce2-s4985.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-nforce2.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-nomadik.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-npcm7xx.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-nvidia-gpu.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-ocores.c i2c: ocores: set IACK bit after core is enabled 2024-11-19 14:19:10 +01:00
i2c-octeon-core.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-octeon-core.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-octeon-platdrv.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-omap.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-opal.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-owl.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-parport.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-pasemi.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-pca-isa.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-pca-platform.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-piix4.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-pmcmsp.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-pnx.c i2c: pnx: Fix timeout in wait functions 2025-01-15 16:29:40 +01:00
i2c-powermac.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-pxa-pci.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-pxa.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-qcom-cci.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-qcom-geni.c Revert "i2c: qcom-geni: Use IRQF_NO_AUTOEN flag in request_irq()" 2024-11-24 00:23:05 +01:00
i2c-qup.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-rcar.c i2c: rcar: fix error code in probe() 2024-11-19 14:19:46 +01:00
i2c-riic.c i2c: riic: Always round-up when calculating bus period 2025-01-15 16:29:41 +01:00
i2c-rk3x.c i2c: rk3x: fix potential spinlock recursion on poll 2024-11-18 12:12:17 +01:00
i2c-robotfuzz-osif.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-s3c2410.c i2c: s3c24xx: fix transferring more than one message in polling mode 2024-11-18 12:12:52 +01:00
i2c-scmi.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-sh7760.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-sh_mobile.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-sibyte.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-simtec.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-sirf.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-sis96x.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-sis630.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-sis5595.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-sprd.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-st.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-stm32.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-stm32.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-stm32f4.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-stm32f7.c Revert "i2c: stm32f7: Do not prepare/unprepare clock during runtime suspend/resume" 2024-11-24 00:23:05 +01:00
i2c-stu300.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-sun6i-p2wi.c i2c: sun6i-p2wi: Prevent potential division by zero 2024-11-18 11:43:14 +01:00
i2c-synquacer.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-taos-evm.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-tegra-bpmp.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-tegra.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-thunderx-pcidrv.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-tiny-usb.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-uniphier-f.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-uniphier.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-versatile.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-via.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-viapro.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-viperboard.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-wmt.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-xgene-slimpro.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-xiic.c Revert "i2c: xiic: Fix broken locking on tx_msg" 2024-11-24 00:23:12 +01:00
i2c-xlp9xx.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-xlr.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i2c-zx2967.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Kconfig Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Makefile Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
scx200_acb.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00