mx6: Revert "mx6: soc: Disable VDDPU regulator"

Commit 022298278 (mx6: soc: Disable VDDPU regulator) is causing kernel hang
for people using FSL kernel 3.0.35 and 3.10, so revert it for now.

Reported-by: Otavio Salvador <otavio@ossystems.com.br>
Reported-by: Pierre Aubert <p.aubert@staubli.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

arch/arm/cpu/armv7/mx6/soc.c

@@ -19,8 +19,6 @@
 #include <asm/arch/mxc_hdmi.h>
 #include <asm/arch/crm_regs.h>
 
-#define VDDPU_MASK	(0x1f << 9)
-
 enum ldo_reg {
 	LDO_ARM,
 	LDO_SOC,
@@ -179,50 +177,11 @@ static void imx_set_wdog_powerdown(bool enable)
 	writew(enable, &wdog2->wmcr);
 }
 
-static void imx_set_vddpu_power_down(void)
-{
-	struct anatop_regs *anatop = (struct anatop_regs *)ANATOP_BASE_ADDR;
-	struct gpc_regs *gpc = (struct gpc_regs *)GPC_BASE_ADDR;
-
-	u32 reg;
-
-	/*
-	 * Disable the brown out detection since we are going to be
-	 * disabling the LDO.
-	 */
-	reg = readl(&anatop->ana_misc2);
-	reg &= ~ANADIG_ANA_MISC2_REG1_BO_EN;
-	writel(reg, &anatop->ana_misc2);
-
-	/* need to power down xPU in GPC before turning off PU LDO */
-	reg = readl(&gpc->gpu_ctrl);
-	writel(reg | 0x1, &gpc->gpu_ctrl);
-
-	reg = readl(&gpc->ctrl);
-	writel(reg | 0x1, &gpc->ctrl);
-	while (readl(&gpc->ctrl) & 0x1)
-		;
-
-	/* Mask the ANATOP brown out interrupt in the GPC. */
-	reg = readl(&gpc->imr4);
-	reg |= 0x80000000;
-	writel(reg, &gpc->imr4);
-
-	/* disable VDDPU */
-	writel(VDDPU_MASK, &anatop->reg_core_clr);
-
-	/* Clear the BO interrupt in the ANATOP. */
-	reg = readl(&anatop->ana_misc1);
-	reg |= 0x80000000;
-	writel(reg, &anatop->ana_misc1);
-}
-
 int arch_cpu_init(void)
 {
 	init_aips();
 
 	imx_set_wdog_powerdown(false); /* Disable PDE bit of WMCR register */
-	imx_set_vddpu_power_down();
 
 #ifdef CONFIG_APBH_DMA
 	/* Start APBH DMA */

arch/arm/include/asm/arch-mx6/crm_regs.h

@@ -890,5 +890,4 @@ struct mxc_ccm_reg {
 #define BF_ANADIG_PFD_528_PFD0_FRAC(v)  \
 	(((v) << 0) & BM_ANADIG_PFD_528_PFD0_FRAC)
 
-#define ANADIG_ANA_MISC2_REG1_BO_EN	(1 << 13)
 #endif /*__ARCH_ARM_MACH_MX6_CCM_REGS_H__ */

arch/arm/include/asm/arch-mx6/imx-regs.h

@@ -663,28 +663,5 @@ struct wdog_regs {
 	u16	wmcr;	/* Miscellaneous Control */
 };
 
-struct gpc_regs {
-	u32	ctrl;		/* 0x000 */
-	u32	pgr;		/* 0x004 */
-	u32	imr1;		/* 0x008 */
-	u32	imr2;		/* 0x00c */
-	u32	imr3;		/* 0x010 */
-	u32	imr4;		/* 0x014 */
-	u32	isr1;		/* 0x018 */
-	u32	isr2;		/* 0x01c */
-	u32	isr3;		/* 0x020 */
-	u32	isr4;		/* 0x024 */
-	u32	reserved1[0x86];
-	u32	gpu_ctrl;	/* 0x260 */
-	u32	gpu_pupscr;	/* 0x264 */
-	u32	gpu_pdnscr;	/* 0x268 */
-	u32	gpu_sr;		/* 0x26c */
-	u32	reserved2[0xc];
-	u32	cpu_ctrl;	/* 0x2a0 */
-	u32	cpu_pupscr;	/* 0x2a4 */
-	u32	cpu_pdnscr;	/* 0x2a8 */
-	u32	cpu_sr;		/* 0x2ac */
-};
-
 #endif /* __ASSEMBLER__*/
 #endif /* __ASM_ARCH_MX6_IMX_REGS_H__ */