linux-kernel - [PATCH V2] ARM: imx: suspend/resume: use outer

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Message-Id: <1514339867-28946-1-git-send-email-peng.fan@nxp.com>
Date:   Wed, 27 Dec 2017 09:57:47 +0800
From:   Peng Fan <peng.fan@....com>
To:     shawnguo@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        van.freenix@...il.com, Peng Fan <peng.fan@....com>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Russell King <linux@...linux.org.uk>,
        Dong Aisheng <aisheng.dong@....com>
Subject: [PATCH V2] ARM: imx: suspend/resume: use outer_disable/resume

Use outer_disable/resume for suspend/resume.
With the two APIs used, code could be simplified and easy to extend
to introduce l2c_write_sec for i.MX platforms when moving Linux Kernel
runs in non-secure world.

Signed-off-by: Peng Fan <peng.fan@....com>
Cc: Shawn Guo <shawnguo@...nel.org>
Cc: Sascha Hauer <kernel@...gutronix.de>
Cc: Fabio Estevam <fabio.estevam@....com>
Cc: Russell King <linux@...linux.org.uk>
Cc: Dong Aisheng <aisheng.dong@....com>
---

V2:
 Fix 6SX booting. The V1 patch does not take 6SX low power idle into
 consideration.
 Tested on 6Q-SDB and 6SX-SDB.

 arch/arm/mach-imx/cpuidle-imx6sx.c |  2 ++
 arch/arm/mach-imx/pm-imx6.c        |  2 ++
 arch/arm/mach-imx/suspend-imx6.S   | 24 ------------------------
 3 files changed, 4 insertions(+), 24 deletions(-)

diff --git a/arch/arm/mach-imx/cpuidle-imx6sx.c b/arch/arm/mach-imx/cpuidle-imx6sx.c
index c5a5c3a70ab1..b35841d133dc 100644
--- a/arch/arm/mach-imx/cpuidle-imx6sx.c
+++ b/arch/arm/mach-imx/cpuidle-imx6sx.c
@@ -49,7 +49,9 @@ static int imx6sx_enter_wait(struct cpuidle_device *dev,
 		cpu_pm_enter();
 		cpu_cluster_pm_enter();
 
+		outer_disable();
 		cpu_suspend(0, imx6sx_idle_finish);
+		outer_resume();
 
 		cpu_cluster_pm_exit();
 		cpu_pm_exit();
diff --git a/arch/arm/mach-imx/pm-imx6.c b/arch/arm/mach-imx/pm-imx6.c
index ecdf071653d4..153a0afc7645 100644
--- a/arch/arm/mach-imx/pm-imx6.c
+++ b/arch/arm/mach-imx/pm-imx6.c
@@ -392,8 +392,10 @@ static int imx6q_pm_enter(suspend_state_t state)
 			imx6_enable_rbc(true);
 		imx_gpc_pre_suspend(true);
 		imx_anatop_pre_suspend();
+		outer_disable();
 		/* Zzz ... */
 		cpu_suspend(0, imx6q_suspend_finish);
+		outer_resume();
 		if (cpu_is_imx6q() || cpu_is_imx6dl())
 			imx_smp_prepare();
 		imx_anatop_post_resume();
diff --git a/arch/arm/mach-imx/suspend-imx6.S b/arch/arm/mach-imx/suspend-imx6.S
index 76ee2ceec8d5..324f6b165e82 100644
--- a/arch/arm/mach-imx/suspend-imx6.S
+++ b/arch/arm/mach-imx/suspend-imx6.S
@@ -74,24 +74,6 @@
 
 	.align 3
 
-	.macro  sync_l2_cache
-
-	/* sync L2 cache to drain L2's buffers to DRAM. */
-#ifdef CONFIG_CACHE_L2X0
-	ldr	r11, [r0, #PM_INFO_MX6Q_L2_V_OFFSET]
-	teq	r11, #0
-	beq	6f
-	mov	r6, #0x0
-	str	r6, [r11, #L2X0_CACHE_SYNC]
-1:
-	ldr	r6, [r11, #L2X0_CACHE_SYNC]
-	ands	r6, r6, #0x1
-	bne	1b
-6:
-#endif
-
-	.endm
-
 	.macro	resume_mmdc
 
 	/* restore MMDC IO */
@@ -185,9 +167,6 @@ ENTRY(imx6_suspend)
 	str	r9, [r11, #MX6Q_SRC_GPR1]
 	str	r1, [r11, #MX6Q_SRC_GPR2]
 
-	/* need to sync L2 cache before DSM. */
-	sync_l2_cache
-
 	ldr	r11, [r0, #PM_INFO_MX6Q_MMDC_V_OFFSET]
 	/*
 	 * put DDR explicitly into self-refresh and
@@ -342,8 +321,5 @@ ENDPROC(imx6_suspend)
 
 ENTRY(v7_cpu_resume)
 	bl	v7_invalidate_l1
-#ifdef CONFIG_CACHE_L2X0
-	bl	l2c310_early_resume
-#endif
 	b	cpu_resume
 ENDPROC(v7_cpu_resume)
-- 
2.14.1