ARM: OMAP: HWMOD: Unify DSS resets for OMAPs

This patch adds a custom DSS reset function used on OMAPs from OMAP2
forward.

The function doesn't actually do a reset, it only waits for the reset to
complete. The reason for this is that on OMAP4 there is no possibility
to do a SW reset, and on OMAP2/3 doing a SW reset for dss_core resets
all the other DSS modules also, thus breaking the HWMOD model where
every DSS module is handled independently.

This fixes the problem with DSS reset on OMAP4, caused by the fact that
because there's no SW reset for dss_core on OMAP4, the HWMOD framework
doesn't try to reset dss_core and thus the DSS clocks were never enabled
at the same time. This causes causes the HWMOD reset to fail for
dss_dispc and dss_rfbi.

The common reset function will also allow us to fix another problem in
the future: before doing a reset we need to disable DSS outputs, which
are in some cases enabled by the bootloader, as otherwise DSS HW seems
to get more or less stuck, requiring a power reset to recover.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
[paul@pwsan.com: modified to build arch/arm/mach-omap2/display.o
 unconditionally to avoid an error when !CONFIG_OMAP2_DSS]
Signed-off-by: Paul Walmsley <paul@pwsan.com>

5 files changed, 43 insertions, 4 deletions

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 69ab1c069134..b009f17dee56 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -4,7 +4,7 @@
 
 # Common support
 obj-y := id.o io.o control.o mux.o devices.o serial.o gpmc.o timer.o pm.o \
-	 common.o gpio.o dma.o wd_timer.o
+	 common.o gpio.o dma.o wd_timer.o display.o
 
 omap-2-3-common				= irq.o sdrc.o
 hwmod-common				= omap_hwmod.o \
@@ -264,7 +264,4 @@ smsc911x-$(CONFIG_SMSC911X)		:= gpmc-smsc911x.o
 obj-y					+= $(smsc911x-m) $(smsc911x-y)
 obj-$(CONFIG_ARCH_OMAP4)		+= hwspinlock.o
 
-disp-$(CONFIG_OMAP2_DSS)		:= display.o
-obj-y					+= $(disp-m) $(disp-y)
-
 obj-y					+= common-board-devices.o twl-common.o
diff --git a/arch/arm/mach-omap2/display.c b/arch/arm/mach-omap2/display.c
index adb2756e242f..941b5459707f 100644
--- a/arch/arm/mach-omap2/display.c
+++ b/arch/arm/mach-omap2/display.c
@@ -27,6 +27,7 @@
 #include <plat/omap_hwmod.h>
 #include <plat/omap_device.h>
 #include <plat/omap-pm.h>
+#include <plat/common.h>
 
 #include "control.h"
 
@@ -172,3 +173,37 @@ int __init omap_display_init(struct omap_dss_board_info *board_data)
 
 	return r;
 }
+
+#define MAX_MODULE_SOFTRESET_WAIT	10000
+int omap_dss_reset(struct omap_hwmod *oh)
+{
+	struct omap_hwmod_opt_clk *oc;
+	int c = 0;
+	int i, r;
+
+	if (!(oh->class->sysc->sysc_flags & SYSS_HAS_RESET_STATUS)) {
+		pr_err("dss_core: hwmod data doesn't contain reset data\n");
+		return -EINVAL;
+	}
+
+	for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
+		if (oc->_clk)
+			clk_enable(oc->_clk);
+
+	omap_test_timeout((omap_hwmod_read(oh, oh->class->sysc->syss_offs)
+				& SYSS_RESETDONE_MASK),
+			MAX_MODULE_SOFTRESET_WAIT, c);
+
+	if (c == MAX_MODULE_SOFTRESET_WAIT)
+		pr_warning("dss_core: waiting for reset to finish failed\n");
+	else
+		pr_debug("dss_core: softreset done\n");
+
+	for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
+		if (oc->_clk)
+			clk_disable(oc->_clk);
+
+	r = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
+
+	return r;
+}
diff --git a/arch/arm/mach-omap2/omap_hwmod_2xxx_3xxx_ipblock_data.c b/arch/arm/mach-omap2/omap_hwmod_2xxx_3xxx_ipblock_data.c
index d78c1324ae59..c11273da5dcc 100644
--- a/arch/arm/mach-omap2/omap_hwmod_2xxx_3xxx_ipblock_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_2xxx_3xxx_ipblock_data.c
@@ -11,6 +11,7 @@
 #include <plat/omap_hwmod.h>
 #include <plat/serial.h>
 #include <plat/dma.h>
+#include <plat/common.h>
 
 #include <mach/irqs.h>
 
@@ -51,6 +52,7 @@ static struct omap_hwmod_class_sysconfig omap2_dss_sysc = {
 struct omap_hwmod_class omap2_dss_hwmod_class = {
 	.name	= "dss",
 	.sysc	= &omap2_dss_sysc,
+	.reset	= omap_dss_reset,
 };
 
 /*
diff --git a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
index cadf0bb2d3b7..3b04d63316f5 100644
--- a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
@@ -30,6 +30,7 @@
 #include <plat/mmc.h>
 #include <plat/i2c.h>
 #include <plat/dmtimer.h>
+#include <plat/common.h>
 
 #include "omap_hwmod_common_data.h"
 
@@ -1187,6 +1188,7 @@ static struct omap_hwmod_class_sysconfig omap44xx_dss_sysc = {
 static struct omap_hwmod_class omap44xx_dss_hwmod_class = {
 	.name	= "dss",
 	.sysc	= &omap44xx_dss_sysc,
+	.reset	= omap_dss_reset,
 };
 
 /* dss */
diff --git a/arch/arm/plat-omap/include/plat/common.h b/arch/arm/plat-omap/include/plat/common.h
index c50df4814f6f..3ff3e36580f2 100644
--- a/arch/arm/plat-omap/include/plat/common.h
+++ b/arch/arm/plat-omap/include/plat/common.h
@@ -30,6 +30,7 @@
 #include <linux/delay.h>
 
 #include <plat/i2c.h>
+#include <plat/omap_hwmod.h>
 
 struct sys_timer;
 
@@ -55,6 +56,8 @@ void am35xx_init_early(void);
 void ti816x_init_early(void);
 void omap4430_init_early(void);
 
+extern int omap_dss_reset(struct omap_hwmod *);
+
 void omap_sram_init(void);
 
 /*