mfd: do tcb6393xb state restore on resume only if requested
As requested by Ian make state restore only if it's requested
by platform data: some platforms do correctly save the state of
the chip during suspend/resume, but some (like tosa) incorrectly
power off the chip at suspend, so the driver supports restoring
some bits of the tc6393xb state (not full, merely enough to support
resume on tosa). With this patch this code is disabled by default.
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Acked-by: Ian Molton <spyro@f2s.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>
diff --git a/arch/arm/mach-pxa/tosa.c b/arch/arm/mach-pxa/tosa.c
index fac846b..a6c4694 100644
--- a/arch/arm/mach-pxa/tosa.c
+++ b/arch/arm/mach-pxa/tosa.c
@@ -746,6 +746,8 @@
.resume = tosa_tc6393xb_resume,
.nand_data = &tosa_tc6393xb_nand_config,
+
+ .resume_restore = 1,
};
diff --git a/drivers/mfd/tc6393xb.c b/drivers/mfd/tc6393xb.c
index 83dc703..c3c64ae 100644
--- a/drivers/mfd/tc6393xb.c
+++ b/drivers/mfd/tc6393xb.c
@@ -369,41 +369,12 @@
/*--------------------------------------------------------------------------*/
-static int tc6393xb_hw_init(struct platform_device *dev)
-{
- struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
- struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
- int i;
-
- iowrite8(tc6393xb->suspend_state.fer, tc6393xb->scr + SCR_FER);
- iowrite16(tcpd->scr_pll2cr, tc6393xb->scr + SCR_PLL2CR);
- iowrite16(tc6393xb->suspend_state.ccr, tc6393xb->scr + SCR_CCR);
- iowrite16(SCR_MCR_RDY_OPENDRAIN | SCR_MCR_RDY_UNK | SCR_MCR_RDY_EN |
- SCR_MCR_INT_OPENDRAIN | SCR_MCR_INT_UNK | SCR_MCR_INT_EN |
- BIT(15), tc6393xb->scr + SCR_MCR);
- iowrite16(tcpd->scr_gper, tc6393xb->scr + SCR_GPER);
- iowrite8(0, tc6393xb->scr + SCR_IRR);
- iowrite8(0xbf, tc6393xb->scr + SCR_IMR);
-
- for (i = 0; i < 3; i++) {
- iowrite8(tc6393xb->suspend_state.gpo_dsr[i],
- tc6393xb->scr + SCR_GPO_DSR(i));
- iowrite8(tc6393xb->suspend_state.gpo_doecr[i],
- tc6393xb->scr + SCR_GPO_DOECR(i));
- iowrite8(tc6393xb->suspend_state.gpi_bcr[i],
- tc6393xb->scr + SCR_GPI_BCR(i));
- }
-
- return 0;
-}
-
static int __devinit tc6393xb_probe(struct platform_device *dev)
{
struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
struct tc6393xb *tc6393xb;
struct resource *iomem, *rscr;
int ret, temp;
- int i;
iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (!iomem)
@@ -458,14 +429,16 @@
if (ret)
goto err_enable;
- tc6393xb->suspend_state.fer = 0;
-
- tc6393xb->suspend_state.ccr = SCR_CCR_UNK1 |
- SCR_CCR_HCLK_48;
-
- ret = tc6393xb_hw_init(dev);
- if (ret)
- goto err_hw_init;
+ iowrite8(0, tc6393xb->scr + SCR_FER);
+ iowrite16(tcpd->scr_pll2cr, tc6393xb->scr + SCR_PLL2CR);
+ iowrite16(SCR_CCR_UNK1 | SCR_CCR_HCLK_48,
+ tc6393xb->scr + SCR_CCR);
+ iowrite16(SCR_MCR_RDY_OPENDRAIN | SCR_MCR_RDY_UNK | SCR_MCR_RDY_EN |
+ SCR_MCR_INT_OPENDRAIN | SCR_MCR_INT_UNK | SCR_MCR_INT_EN |
+ BIT(15), tc6393xb->scr + SCR_MCR);
+ iowrite16(tcpd->scr_gper, tc6393xb->scr + SCR_GPER);
+ iowrite8(0, tc6393xb->scr + SCR_IRR);
+ iowrite8(0xbf, tc6393xb->scr + SCR_IMR);
printk(KERN_INFO "Toshiba tc6393xb revision %d at 0x%08lx, irq %d\n",
tmio_ioread8(tc6393xb->scr + SCR_REVID),
@@ -514,7 +487,6 @@
err_gpio_add:
if (tc6393xb->gpio.base != -1)
temp = gpiochip_remove(&tc6393xb->gpio);
-err_hw_init:
tcpd->disable(dev);
err_clk_enable:
clk_disable(tc6393xb->clk);
@@ -592,15 +564,37 @@
struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
int ret;
+ int i;
clk_enable(tc6393xb->clk);
ret = tcpd->resume(dev);
-
if (ret)
return ret;
- return tc6393xb_hw_init(dev);
+ if (!tcpd->resume_restore)
+ return 0;
+
+ iowrite8(tc6393xb->suspend_state.fer, tc6393xb->scr + SCR_FER);
+ iowrite16(tcpd->scr_pll2cr, tc6393xb->scr + SCR_PLL2CR);
+ iowrite16(tc6393xb->suspend_state.ccr, tc6393xb->scr + SCR_CCR);
+ iowrite16(SCR_MCR_RDY_OPENDRAIN | SCR_MCR_RDY_UNK | SCR_MCR_RDY_EN |
+ SCR_MCR_INT_OPENDRAIN | SCR_MCR_INT_UNK | SCR_MCR_INT_EN |
+ BIT(15), tc6393xb->scr + SCR_MCR);
+ iowrite16(tcpd->scr_gper, tc6393xb->scr + SCR_GPER);
+ iowrite8(0, tc6393xb->scr + SCR_IRR);
+ iowrite8(0xbf, tc6393xb->scr + SCR_IMR);
+
+ for (i = 0; i < 3; i++) {
+ iowrite8(tc6393xb->suspend_state.gpo_dsr[i],
+ tc6393xb->scr + SCR_GPO_DSR(i));
+ iowrite8(tc6393xb->suspend_state.gpo_doecr[i],
+ tc6393xb->scr + SCR_GPO_DOECR(i));
+ iowrite8(tc6393xb->suspend_state.gpi_bcr[i],
+ tc6393xb->scr + SCR_GPI_BCR(i));
+ }
+
+ return 0;
}
#else
#define tc6393xb_suspend NULL
diff --git a/include/linux/mfd/tc6393xb.h b/include/linux/mfd/tc6393xb.h
index 1fa8206..3ce10ae 100644
--- a/include/linux/mfd/tc6393xb.h
+++ b/include/linux/mfd/tc6393xb.h
@@ -33,6 +33,10 @@
void (*teardown)(struct platform_device *dev);
struct tmio_nand_data *nand_data;
+
+ unsigned resume_restore : 1; /* make special actions
+ to preserve the state
+ on suspend/resume */
};
/*