From patchwork Thu May 12 11:40:08 2011
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X-Patchwork-Submitter: Tomi Valkeinen <tomi.valkeinen@ti.com>
X-Patchwork-Id: 779612
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From: Tomi Valkeinen <tomi.valkeinen@ti.com>
To: linux-omap@vger.kernel.org, linux-fbdev@vger.kernel.org
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Subject: [PATCHv2 3/8] OMAP: DSS2: RFBI: add rfbi_bus_lock
Date: Thu, 12 May 2011 14:40:08 +0300
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	Thu, 12 May 2011 11:40:38 +0000 (UTC)

Add similar bus lock to RFBI as is in DSI. The panel driver can use the
bus lock to mark that the RFBI bus is currently in use.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 drivers/video/omap2/dss/rfbi.c |   16 ++++++++++++++++
 include/video/omapdss.h        |    2 ++
 2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/drivers/video/omap2/dss/rfbi.c b/drivers/video/omap2/dss/rfbi.c
index 0985f2f..46817e7 100644
--- a/drivers/video/omap2/dss/rfbi.c
+++ b/drivers/video/omap2/dss/rfbi.c
@@ -32,6 +32,7 @@
 #include <linux/ktime.h>
 #include <linux/hrtimer.h>
 #include <linux/seq_file.h>
+#include <linux/semaphore.h>
 
 #include <video/omapdss.h>
 #include "dss.h"
@@ -119,6 +120,8 @@ static struct {
 	struct completion cmd_done;
 	atomic_t          cmd_fifo_full;
 	atomic_t          cmd_pending;
+
+	struct semaphore bus_lock;
 } rfbi;
 
 struct update_region {
@@ -146,6 +149,18 @@ static void rfbi_enable_clocks(bool enable)
 		dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
 }
 
+void rfbi_bus_lock(void)
+{
+	down(&rfbi.bus_lock);
+}
+EXPORT_SYMBOL(rfbi_bus_lock);
+
+void rfbi_bus_unlock(void)
+{
+	up(&rfbi.bus_lock);
+}
+EXPORT_SYMBOL(rfbi_bus_unlock);
+
 void omap_rfbi_write_command(const void *buf, u32 len)
 {
 	rfbi_enable_clocks(1);
@@ -1022,6 +1037,7 @@ static int omap_rfbihw_probe(struct platform_device *pdev)
 	rfbi.pdev = pdev;
 
 	spin_lock_init(&rfbi.cmd_lock);
+	sema_init(&rfbi.bus_lock, 1);
 
 	init_completion(&rfbi.cmd_done);
 	atomic_set(&rfbi.cmd_fifo_full, 0);
diff --git a/include/video/omapdss.h b/include/video/omapdss.h
index ab7d656..1ea151e 100644
--- a/include/video/omapdss.h
+++ b/include/video/omapdss.h
@@ -212,6 +212,8 @@ int omap_rfbi_enable_te(bool enable, unsigned line);
 int omap_rfbi_setup_te(enum omap_rfbi_te_mode mode,
 			     unsigned hs_pulse_time, unsigned vs_pulse_time,
 			     int hs_pol_inv, int vs_pol_inv, int extif_div);
+void rfbi_bus_lock(void);
+void rfbi_bus_unlock(void);
 
 /* DSI */
 void dsi_bus_lock(void);