Thread (4 messages) flat view 4 messages, 1 author, 2019-09-16

RE: [1/3] soc: fsl: fix that flextimer cannot wakeup system in deep sleep on LS1021A

From: Biwen Li <hidden>
Date: 2019-09-16 10:48:51
Also in: linux-arm-kernel, linux-devicetree, lkml

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 
quoted hunk ↗ jump to hunk
Why:
    - Cannot write register RCPM_IPPDEXPCR1 on LS1021A,
      Register RCPM_IPPDEXPCR1's default value is zero.
      So the register value that reading from register
      RCPM_IPPDEXPCR1 is always zero.

How:
    - 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)

Signed-off-by: Biwen Li <redacted>
---
 drivers/soc/fsl/rcpm.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
diff --git a/drivers/soc/fsl/rcpm.c b/drivers/soc/fsl/rcpm.c index
82c0ad5e663e..2bf37d38efe5 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
@@ -63,6 +65,33 @@ static int rcpm_pm_prepare(struct device *dev)
 					tmp |= value[i + 1];
 					iowrite32be(tmp, rcpm->ippdexpcr_base + i * 4);
 				}
+				#ifdef CONFIG_SOC_LS1021A
+				/* Workaround: There is a bug of register ippdexpcr1,
+				 * cannot write it but can read it.Tt's default value is zero,
+				 * then read it will always returns zero.
+				 * So save ippdexpcr1's value to register SCFG_SPARECR8.
+				 * And the value of ippdexpcr1 will be read from
SCFG_SPARECR8.
+				 */
+				{
+					struct regmap * rcpm_scfg_regmap = NULL;
+					u32 reg_offset[RCPM_WAKEUP_CELL_MAX_SIZE + 1];
+					u32 reg_value = 0;
+
+					rcpm_scfg_regmap =
syscon_regmap_lookup_by_phandle(np, "fsl,rcpm-scfg");
+					if (rcpm_scfg_regmap) {
+						if (of_property_read_u32_array(dev->of_node,
+						    "fsl,rcpm-scfg", reg_offset,
rcpm->wakeup_cells + 1)) {
+							rcpm_scfg_regmap = NULL;
+							continue;
+						}
+						regmap_read(rcpm_scfg_regmap, reg_offset[i + 1],
&reg_value);
+						/* Write value to register SCFG_SPARECR8 */
+						regmap_write(rcpm_scfg_regmap, reg_offset[i +
1], tmp | reg_value);
+					}
+				}
+				#endif
+
+
 			}
 		}
 	} while (ws = wakeup_source_get_next(ws));
--
2.17.1
  
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