diff options
| author | Anson Huang <Anson.Huang@nxp.com> | 2017-12-28 00:54:19 +0800 |
|---|---|---|
| committer | Leonard Crestez <leonard.crestez@nxp.com> | 2018-08-24 12:41:33 +0300 |
| commit | 052d36086ef7f2b70dd2261f8196f6d762bbccf5 (patch) | |
| tree | 68dceae2e955e8c391efff98e33dfb107edfce01 /arch/arm/mach-imx/pm-imx7ulp.c | |
| parent | 6db3b8e31f1501b8ea43f95dcf071538feb04372 (diff) | |
MLK-17317 arm: imx: add no_console_suspend support for i.mx7ulp vlls mode
LPUART driver currently turns off clocks during device
suspend phase, but in i.MX7ULP platform low level suspend
routine, lpuart will be saved/restored during suspend/resume,
to avoid system hang caused by accessing lpuart registers
without clocks enable, add console_suspend_enabled check for
lpuart register save/restore.
SCG1 SOSCDIV register needs to be saved/restored anyway,
move it to asm code, all SCG1 registers will be restored
there.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Acked-by: Fugang Duan <fugang.duan@nxp.com>
Rviewed-by: Bai Ping <ping.bai@nxp.com>
Diffstat (limited to 'arch/arm/mach-imx/pm-imx7ulp.c')
| -rw-r--r-- | arch/arm/mach-imx/pm-imx7ulp.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/arm/mach-imx/pm-imx7ulp.c b/arch/arm/mach-imx/pm-imx7ulp.c index e6a77c69954c..63fe0d4ed7f5 100644 --- a/arch/arm/mach-imx/pm-imx7ulp.c +++ b/arch/arm/mach-imx/pm-imx7ulp.c @@ -11,6 +11,7 @@ */ #include <linux/delay.h> +#include <linux/console.h> #include <linux/init.h> #include <linux/io.h> #include <linux/interrupt.h> @@ -155,11 +156,12 @@ static u32 pcc3_regs[16][2] = { {0xc0, 0}, {0xc4, 0}, {0x140, 0}, {0x144, 0}, }; -static u32 scg1_offset[16] = { +static u32 scg1_offset[17] = { 0x14, 0x30, 0x40, 0x304, 0x500, 0x504, 0x508, 0x50c, 0x510, 0x514, 0x600, 0x604, 0x608, 0x60c, 0x610, 0x614, + 0x104, }; extern unsigned long iram_tlb_base_addr; @@ -251,7 +253,7 @@ struct imx7ulp_cpu_pm_info { void __iomem *mmdc_base; void __iomem *mmdc_io_base; void __iomem *smc1_base; - u32 scg1[16]; + u32 scg1[17]; u32 ttbr1; /* Store TTBR1 */ u32 gpio[4][2]; u32 iomux_num; /* Number of IOs which need saved/restored. */ @@ -290,7 +292,7 @@ static void imx7ulp_scg1_save(void) { int i; - for (i = 0; i < 16; i++) + for (i = 0; i < 17; i++) pm_info->scg1[i] = readl_relaxed(scg1_base + scg1_offset[i]); } @@ -353,7 +355,6 @@ static void imx7ulp_lpuart_save(void) static void imx7ulp_lpuart_restore(void) { - writel_relaxed(0x10101, scg1_base + 0x104); writel_relaxed(LPUART4_MUX_VALUE, iomuxc1_base + PTC2_LPUART4_TX_OFFSET); writel_relaxed(LPUART4_MUX_VALUE, @@ -491,7 +492,8 @@ static int imx7ulp_pm_enter(suspend_state_t state) imx7ulp_pcc2_save(); imx7ulp_pcc3_save(); imx7ulp_tpm_save(); - imx7ulp_lpuart_save(); + if (!console_suspend_enabled) + imx7ulp_lpuart_save(); imx7ulp_iomuxc_save(); imx7ulp_set_lpm(VLLS); @@ -500,7 +502,8 @@ static int imx7ulp_pm_enter(suspend_state_t state) imx7ulp_pcc2_restore(); imx7ulp_pcc3_restore(); - imx7ulp_lpuart_restore(); + if (!console_suspend_enabled) + imx7ulp_lpuart_restore(); imx7ulp_set_dgo(0); imx7ulp_tpm_restore(); imx7ulp_set_lpm(RUN); |