Hi all, the linux patch depended by RCPM driver,FlexTimer driver and FlexTimer dts, need apply these patches as follows: 1. RCPM driver: https://patchwork.kernel.org/series/162731/mbox/ (https://patchwork.kernel.org/patch/11105279/) 2. FlexTimer dts: https://lore.kernel.org/patchwork/series/405653/mbox/ (https://lore.kernel.org/patchwork/patch/1112493/) 3. FlexTimer driver: https://patchwork.ozlabs.org/series/124718/mbox/ (https://patchwork.ozlabs.org/patch/1145999/) https://patchwork.ozlabs.org/series/126942/mbox/ (https://patchwork.ozlabs.org/patch/1152085/) 4. Adjust drivers/soc/fsl/Makefile: remove the line 'obj-y += ftm_alarm.o' in drivers/soc/fsl/Makefile to resolve a compilation error > 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 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 | 33 +++++++++++++++++++++++++++++++++ > 1 file changed, 33 insertions(+) > > diff --git a/drivers/soc/fsl/rcpm.c b/drivers/soc/fsl/rcpm.c index > 82c0ad5e663e..9a29c482fc2e 100644 > --- a/drivers/soc/fsl/rcpm.c > +++ b/drivers/soc/fsl/rcpm.c > @@ -13,6 +13,8 @@ > #include <linux/slab.h> > #include <linux/suspend.h> > #include <linux/kernel.h> > +#include <linux/regmap.h> > +#include <linux/mfd/syscon.h> > > #define RCPM_WAKEUP_CELL_MAX_SIZE 7 > > @@ -29,6 +31,9 @@ static int rcpm_pm_prepare(struct device *dev) > struct rcpm *rcpm; > u32 value[RCPM_WAKEUP_CELL_MAX_SIZE + 1], tmp; > int i, ret, idx; > + 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) > @@ -63,6 +68,34 @@ static int rcpm_pm_prepare(struct device *dev) > tmp |= value[i + 1]; > iowrite32be(tmp, rcpm->ippdexpcr_base + i * 4); > } > + /* 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. > + */ > + scfg_addr_regmap = > syscon_regmap_lookup_by_phandle(np, > + > "fsl,ippdexpcr1-alt-addr"); > + if (scfg_addr_regmap && (1 == i)) { > + if (of_property_read_u32_array(dev->of_node, > + "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); > + } > } > } > } while (ws = wakeup_source_get_next(ws)); > -- > 2.17.1
