From: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Date: Thu, 1 Dec 2011 21:16:26 +0000 (+0100)
Subject: ARM: OMAP1: Update dpll1 default rate reprogramming method
X-Git-Tag: v3.3-rc1~139^2~8^2~1
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=f9e5908fa04e15a681dc4695b53c2c0c1d9b9a03;p=linux.git

ARM: OMAP1: Update dpll1 default rate reprogramming method

According to comments in omap1_select_table_rate(), reprogramming dpll1
is tricky, and should always be done from SRAM.

While being at it, move OMAP730 special case handling inside
omap_sram_reprogram_clock().

Created on top of version 2 of the series "ARM: OMAP1: Fix dpll1
reprogramming related issues", which it depends on.
Tested on Amstrad Delta.

Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---

diff --git a/arch/arm/mach-omap1/clock.c b/arch/arm/mach-omap1/clock.c
index ff27dbdba3d6..6d8f7c640237 100644
--- a/arch/arm/mach-omap1/clock.c
+++ b/arch/arm/mach-omap1/clock.c
@@ -218,12 +218,8 @@ int omap1_select_table_rate(struct clk *clk, unsigned long rate)
 	/*
 	 * In most cases we should not need to reprogram DPLL.
 	 * Reprogramming the DPLL is tricky, it must be done from SRAM.
-	 * (on 730, bit 13 must always be 1)
 	 */
-	if (cpu_is_omap7xx())
-		omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val | 0x2000);
-	else
-		omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val);
+	omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val);
 
 	/* XXX Do we need to recalculate the tree below DPLL1 at this point? */
 	ck_dpll1_p->rate = ptr->pll_rate;
diff --git a/arch/arm/mach-omap1/clock_data.c b/arch/arm/mach-omap1/clock_data.c
index ff2d5248df23..9d1a42a5afd8 100644
--- a/arch/arm/mach-omap1/clock_data.c
+++ b/arch/arm/mach-omap1/clock_data.c
@@ -25,6 +25,7 @@
 #include <plat/clock.h>
 #include <plat/cpu.h>
 #include <plat/clkdev_omap.h>
+#include <plat/sram.h>	/* for omap_sram_reprogram_clock() */
 #include <plat/usb.h>   /* for OTG_BASE */
 
 #include "clock.h"
@@ -944,8 +945,10 @@ void __init omap1_clk_late_init(void)
 	/* Find the highest supported frequency and enable it */
 	if (omap1_select_table_rate(&virtual_ck_mpu, ~0)) {
 		pr_err("System frequencies not set, using default. Check your config.\n");
-		omap_writew(0x2290, DPLL_CTL);
-		omap_writew(cpu_is_omap7xx() ? 0x2005 : 0x0005, ARM_CKCTL);
+		/*
+		 * Reprogramming the DPLL is tricky, it must be done from SRAM.
+		 */
+		omap_sram_reprogram_clock(0x2290, 0x0005);
 		ck_dpll1.rate = OMAP1_DPLL1_SANE_VALUE;
 	}
 	propagate_rate(&ck_dpll1);
diff --git a/arch/arm/plat-omap/sram.c b/arch/arm/plat-omap/sram.c
index 574351902c83..6b058a621e8d 100644
--- a/arch/arm/plat-omap/sram.c
+++ b/arch/arm/plat-omap/sram.c
@@ -222,6 +222,9 @@ static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
 void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
 {
 	BUG_ON(!_omap_sram_reprogram_clock);
+	/* On 730, bit 13 must always be 1 */
+	if (cpu_is_omap7xx())
+		ckctl |= 0x2000;
 	_omap_sram_reprogram_clock(dpllctl, ckctl);
 }