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Message-Id: <20190917044119.21895-1-biwen.li@nxp.com>
Date: Tue, 17 Sep 2019 12:41:17 +0800
From: Biwen Li <biwen.li@....com>
To: leoyang.li@....com, shawnguo@...nel.org, robh+dt@...nel.org,
mark.rutland@....com
Cc: linuxppc-dev@...ts.ozlabs.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, Biwen Li <biwen.li@....com>
Subject: [v2,1/3] soc: fsl: fix that flextimer cannot wakeup system in deep sleep on LS1021A
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 <biwen.li@....com>
---
Change in v2:
- fix stype problems
drivers/soc/fsl/rcpm.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/drivers/soc/fsl/rcpm.c b/drivers/soc/fsl/rcpm.c
index 82c0ad5e663e..0b710c24999c 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 +65,31 @@ 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], ®_value);
+ /* Write value to register SCFG_SPARECR8 */
+ regmap_write(rcpm_scfg_regmap, reg_offset[i + 1], tmp | reg_value);
+ }
+ }
+ #endif //CONFIG_SOC_LS1021A
}
}
} while (ws = wakeup_source_get_next(ws));
--
2.17.1
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