Hi All, 1.Need apply below patches before apply these patches. 1.1 Flextimer dts https://lore.kernel.org/patchwork/series/405653/mbox/ (https://lore.kernel.org/patchwork/patch/1112493/) 1.2 RCPM driver https://lore.kernel.org/patchwork/patch/1143809/mbox/ [v10,1/3] PM: wakeup: Add routine to help fetch wakeup source object) https://lore.kernel.org/patchwork/patch/1143810/mbox/ ([v10,2/3] Documentation: dt: binding: fsl: Add 'little-endian' and update Chassis define) https://lore.kernel.org/patchwork/patch/1143811/mbox/ ([v10,3/3] soc: fsl: add RCPM driver) > Subject: [v5 1/3] soc: fsl: handle RCPM errata A-008646 on SoC LS1021A > > Description: > - Reading configuration register RCPM_IPPDEXPCR1 > always return zero > > Workaround: > - Save register RCPM_IPPDEXPCR1's value to > register SCFG_SPARECR8.(uboot's psci also > need reading value from the register SCFG_SPARECR8 > to set register RCPM_IPPDEXPCR1) > > Impact: > - FlexTimer module will cannot wakeup system in > deep sleep on SoC LS1021A > > Signed-off-by: Biwen Li <biwen.li@xxxxxxx> > --- > Change in v5: > - update the patch, because of rcpm driver has updated. > > Change in v4: > - rename property name > fsl,ippdexpcr-alt-addr -> fsl,ippdexpcr1-alt-addr > > Change in v3: > - update commit message > - rename property name > fsl,rcpm-scfg -> fsl,ippdexpcr-alt-addr > > Change in v2: > - fix stype problems > > drivers/soc/fsl/rcpm.c | 47 > ++++++++++++++++++++++++++++++++++++++++-- > 1 file changed, 45 insertions(+), 2 deletions(-) > > diff --git a/drivers/soc/fsl/rcpm.c b/drivers/soc/fsl/rcpm.c index > a093dbe6d2cb..775c618f0456 100644 > --- a/drivers/soc/fsl/rcpm.c > +++ b/drivers/soc/fsl/rcpm.c > @@ -6,13 +6,16 @@ > // > // Author: Ran Wang <ran.wang_1@xxxxxxx> > > +#include <linux/acpi.h> > #include <linux/init.h> > +#include <linux/kernel.h> > +#include <linux/mfd/syscon.h> > #include <linux/module.h> > -#include <linux/platform_device.h> > #include <linux/of_address.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > #include <linux/slab.h> > #include <linux/suspend.h> > -#include <linux/kernel.h> > > #define RCPM_WAKEUP_CELL_MAX_SIZE 7 > > @@ -37,6 +40,9 @@ static int rcpm_pm_prepare(struct device *dev) > struct device_node *np = dev->of_node; > u32 value[RCPM_WAKEUP_CELL_MAX_SIZE + 1]; > u32 setting[RCPM_WAKEUP_CELL_MAX_SIZE] = {0}; > + struct regmap *scfg_addr_regmap = NULL; > + u32 reg_offset[RCPM_WAKEUP_CELL_MAX_SIZE + 1]; > + u32 reg_value = 0; > > rcpm = dev_get_drvdata(dev); > if (!rcpm) > @@ -90,6 +96,43 @@ static int rcpm_pm_prepare(struct device *dev) > tmp |= ioread32be(address); > iowrite32be(tmp, address); > } > + /* > + * Workaround of errata A-008646 on SoC LS1021A: > + * There is a bug of register ippdexpcr1. > + * Reading configuration register RCPM_IPPDEXPCR1 > + * always return zero. So save ippdexpcr1's value > + * to register SCFG_SPARECR8.And the value of > + * ippdexpcr1 will be read from SCFG_SPARECR8. > + */ > + if (device_property_present(dev, "fsl,ippdexpcr1-alt-addr")) { > + if (dev_of_node(dev)) { > + scfg_addr_regmap = > syscon_regmap_lookup_by_phandle(np, > + > "fsl,ippdexpcr1-alt-addr"); > + } else if (is_acpi_node(dev->fwnode)) { > + dev_err(dev, "not support acpi for rcpm\n"); > + continue; > + } > + > + if (scfg_addr_regmap && (i == 1)) { > + if (device_property_read_u32_array(dev, > + "fsl,ippdexpcr1-alt-addr", > + reg_offset, > + 1 + sizeof(u64)/sizeof(u32))) { > + scfg_addr_regmap = NULL; > + continue; > + } > + /* Read value from register SCFG_SPARECR8 */ > + regmap_read(scfg_addr_regmap, > + (u32)(((u64)(reg_offset[1] << (sizeof(u32) * 8) | > + reg_offset[2])) & 0xffffffff), > + ®_value); > + /* Write value to register SCFG_SPARECR8 */ > + regmap_write(scfg_addr_regmap, > + (u32)(((u64)(reg_offset[1] << (sizeof(u32) * 8) | > + reg_offset[2])) & 0xffffffff), > + tmp | reg_value); > + } > + } > } > > return 0; > -- > 2.17.1
