On 2017/1/3 18:03, Hanjun Guo wrote: > Hi Ding, > > On 2016/12/23 15:04, Ding Tianhong wrote: >> Erratum Hisilicon-161601 says that the ARM generic timer counter "has the >> potential to contain an erroneous value when the timer value changes". >> Accesses to TVAL (both read and write) are also affected due to the implicit counter >> read. Accesses to CVAL are not affected. >> >> The workaround is to reread the system count registers until the value of the second >> read is larger than the first one by less than 32, the system counter can be guaranteed >> not to return wrong value twice by back-to-back read and the error value is always larger >> than the correct one by 32. Writes to TVAL are replaced with an equivalent write to CVAL. >> >> v2: Introducing a new generic erratum handling mechanism for fsl,a008585 and hisilicon,161601. >> Significant rework based on feedback, including seperate the fsl erratum a008585 >> to another patch, update the erratum name and remove unwanted code. >> >> v3: Introducing the erratum_workaround_set_sne generic function for fsl erratum a008585 >> and make the #define __fsl_a008585_read_reg to be private to the .c file instead of >> being globally visible. After discussion with Marc and Will, a consensus decision was >> made to remove the commandline parameter for enabling fsl,erratum-a008585 erratum, >> and make some generic name more specific, export timer_unstable_counter_workaround >> for module access. >> >> Significant rework based on feedback, including fix some alignment problem, make the >> #define __hisi_161601_read_reg to be private to the .c file instead of being globally >> visible, add more accurate annotation and modify a bit of logical format to enable >> arch_timer_read_ool_enabled, remove the kernel commandline parameter >> clocksource.arm_arch_timer.hisilicon-161601. >> >> Introduce a generic aquick framework for erratum in ACPI mode. >> >> v4: rename the quirk handler parameter to make it more generic, and >> avoid break loop when handling the quirk becasue it need to >> support multi quirks handler. >> >> update some data structures for acpi mode. >> >> v5: Adapt the new kernel-parameters.txt for latest kernel version. >> Set the retries of reread system counter to 50, because it is possible >> that some interrupts may lead to more than twice read errors and break the loop, >> it will trigger the warning, so we set the number of retries far beyond the number of >> iterations the loop has been observed to take. >> >> Ding Tianhong (4): >> arm64: arch_timer: Add device tree binding for hisilicon-161601 >> erratum >> arm64: arch_timer: Introduce a generic erratum handing mechanism for >> fsl-a008585 >> arm64: arch_timer: Work around Erratum Hisilicon-161601 >> arm64: arch timer: Add timer erratum property for Hip05-d02 and >> Hip06-d03 >> >> Hanjun Guo (2): >> arm64: arch_timer: apci: Introduce a generic aquirk framework for >> erratum >> arm64: arch_timer: acpi: add hisi timer errata data > > Since the ACPI code is conflict with Fuwei's GTDT patch set, let's split this patch > set into two parts, one is the DT based code, and the other is the ACPI part, > I will rebase ACPI code on top of Fuwei's patch set so please go upstream first. > Hi Hanjuno< OK, I will remove the last 2 patch and resend a new version only support DT. > Thanks > Hanjun > > > . > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
