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From: Paul Walmsley <paul@pwsan.com>
To: linux-omap@vger.kernel.org
Cc: Rajendra Nayak <rnayak@ti.com>
Subject: [PATCH 5/8] OMAP3 SDRC: Move the clk stabilization delay to the right place
Date: Fri, 24 Jul 2009 20:11:29 -0600	[thread overview]
Message-ID: <20090725021127.29059.29503.stgit@localhost.localdomain> (raw)
In-Reply-To: <20090725021102.29059.94214.stgit@localhost.localdomain>

From: Rajendra Nayak <rnayak@ti.com>

The clock stabilization delay post a M2 divider change is needed
even before a SDRC interface clock re-enable and not only before
jumping back to SDRAM.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
---
 arch/arm/mach-omap2/sram34xx.S |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-omap2/sram34xx.S b/arch/arm/mach-omap2/sram34xx.S
index e6b1125..82aa4a3 100644
--- a/arch/arm/mach-omap2/sram34xx.S
+++ b/arch/arm/mach-omap2/sram34xx.S
@@ -127,6 +127,8 @@ skip_cs1_params:
 	blne	lock_dll
 	bl	sdram_in_selfrefresh	@ put SDRAM in self refresh, idle SDRC
 	bl 	configure_core_dpll	@ change the DPLL3 M2 divider
+	mov	r12, r2
+	bl	wait_clk_stable		@ wait for SDRC to stabilize
 	bl	enable_sdrc		@ take SDRC out of idle
 	cmp	r1, #SDRC_UNLOCK_DLL	@ wait for DLL status to change
 	bleq	wait_dll_unlock
@@ -134,8 +136,6 @@ skip_cs1_params:
 	cmp	r3, #1			@ if increasing SDRC clk rate,
 	beq	return_to_sdram		@ return to SDRAM code, otherwise,
 	bl	configure_sdrc		@ reprogram SDRC regs now
-	mov	r12, r2
-	bl	wait_clk_stable		@ wait for SDRC to stabilize
 return_to_sdram:
 	isb				@ prevent speculative exec past here
 	mov 	r0, #0 			@ return value



  parent reply	other threads:[~2009-07-25  2:13 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-07-25  2:11 [PATCH 0/8] Fixes for OMAP2/3 SDRC/clock for 2.6.31-rc* Paul Walmsley
2009-07-25  2:11 ` [PATCH 1/8] OMAP3 SDRC: add support for 2 SDRAM chip selects Paul Walmsley
2009-07-25  2:11 ` [PATCH 2/8] OMAP3: Setup MUX settings for SDRC CKE signals Paul Walmsley
2009-07-25  2:11 ` [PATCH 3/8] OMAP2/3 SDRC: don't set SDRC_POWER.PWDENA on boot Paul Walmsley
2009-07-25  2:11 ` [PATCH 4/8] OMAP3 SDRC: Fix freeze when scaling CORE dpll to < 83Mhz Paul Walmsley
2009-07-25  2:11 ` Paul Walmsley [this message]
2009-07-25  2:11 ` [PATCH 6/8] OMAP2/3 clock: split, rename omap2_wait_clock_ready() Paul Walmsley
2009-07-25  2:11 ` [PATCH 7/8] OMAP2 clock: 2430 I2CHS uses non-standard CM_IDLEST register Paul Walmsley
2009-07-25  2:11 ` [PATCH 8/8] OMAP3 clock: correct module IDLEST bits: SSI; DSS; USBHOST; HSOTGUSB Paul Walmsley

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