MLK-12861-2 ARM: imx: enable necessary clock for RDC resume on i.mx7d

When Mega/Fast Mix off in DSM mode, RDC recovery needs PCIe/PXP/EIM
clock to be enabled, otherwise, with M4 enabled, DSM resume will fail.

We only enable them before entering DSM and hardware will disable
them when DSM is entered and they will be re-enabled after resume,
then in low level resume phase, we will disable them again.

Signed-off-by: Anson Huang <[email protected]>

Author: Anson-Huang

arch/arm/mach-imx/pm-imx7.c

@@ -78,6 +78,8 @@
 
 #define CCM_LPCG_START		0x4040
 #define CCM_LPCG_STEP		0x10
+#define CCM_EIM_LPCG		0x4160
+#define CCM_PXP_LPCG		0x44c0
 #define CCM_PCIE_LPCG		0x4600
 
 #define BM_CCM_ROOT_POST_PODF	0x3f
@@ -715,11 +717,15 @@ static int imx7_pm_enter(suspend_state_t state)
 		imx_gpcv2_pre_suspend(true);
 		if (imx_gpcv2_is_mf_mix_off()) {
 			/*
-			 * per design requirement, EXSC for PCIe/EIM
+			 * per design requirement, EXSC for PCIe/EIM/PXP
 			 * will need clock to recover RDC setting on
 			 * resume, so enable PCIe/EIM LPCG for RDC
 			 * recovery when M/F mix off
 			 */
+			writel_relaxed(0x3, pm_info->ccm_base.vbase +
+				CCM_EIM_LPCG);
+			writel_relaxed(0x3, pm_info->ccm_base.vbase +
+				CCM_PXP_LPCG);
 			writel_relaxed(0x3, pm_info->ccm_base.vbase +
 				CCM_PCIE_LPCG);
 			/* stop m4 if mix will also be shutdown */
@@ -759,6 +765,10 @@ static int imx7_pm_enter(suspend_state_t state)
 		}
 		if (imx_gpcv2_is_mf_mix_off() ||
 			imx7_pm_is_resume_from_lpsr()) {
+			writel_relaxed(0x0, pm_info->ccm_base.vbase +
+				CCM_EIM_LPCG);
+			writel_relaxed(0x0, pm_info->ccm_base.vbase +
+				CCM_PXP_LPCG);
 			writel_relaxed(0x0, pm_info->ccm_base.vbase +
 				CCM_PCIE_LPCG);
 			memcpy(ocram_base, ocram_saved_in_ddr, ocram_size);