[U-Boot] [PATCH v2] video: ipuv3_fb: skip IPU shutdown if IPU was not enabled before

[Anatolij Gustschin]

Boards can skip display interface init using board_video_skip().
If display interface was not initialized (e.g. no ipuv3 framebuffer
registered or IPU clock disabled), booting Linux stops due to the
crash in IPU shutdown function, when accessing IPU registers.
Check IPU clock and skip shutdown if clock is not enabled.

Signed-off-by: Anatolij Gustschin <agust at denx.de>
---
Changes in v2:
- fixed build breakage when building mx5 targets

 drivers/video/ipu.h          | 1 +
 drivers/video/ipu_common.c   | 5 +++++
 drivers/video/mxc_ipuv3_fb.c | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/drivers/video/ipu.h b/drivers/video/ipu.h
index 348be58..ff91d18 100644
--- a/drivers/video/ipu.h
+++ b/drivers/video/ipu.h
@@ -253,6 +253,7 @@ struct clk *clk_get_parent(struct clk *clk);
 
 void ipu_dump_registers(void);
 int ipu_probe(void);
+bool ipu_clk_enabled(void);
 
 void ipu_dmfc_init(int dmfc_type, int first);
 void ipu_init_dc_mappings(void);
diff --git a/drivers/video/ipu_common.c b/drivers/video/ipu_common.c
index f8d4488..f259fb9 100644
--- a/drivers/video/ipu_common.c
+++ b/drivers/video/ipu_common.c
@@ -1243,3 +1243,8 @@ int ipu_set_ldb_clock(int rate)
 
 	return 0;
 }
+
+bool ipu_clk_enabled(void)
+{
+	return g_ipu_clk_enabled;
+}
diff --git a/drivers/video/mxc_ipuv3_fb.c b/drivers/video/mxc_ipuv3_fb.c
index 0d0a0a9..1ab5cb7 100644
--- a/drivers/video/mxc_ipuv3_fb.c
+++ b/drivers/video/mxc_ipuv3_fb.c
@@ -571,6 +571,9 @@ void ipuv3_fb_shutdown(void)
 	int i;
 	struct ipu_stat *stat = (struct ipu_stat *)IPU_STAT;
 
+	if (!ipu_clk_enabled())
+		return;
+
 	for (i = 0; i < ARRAY_SIZE(mxcfb_info); i++) {
 		struct fb_info *fbi = mxcfb_info[i];
 		if (fbi) {
-- 
2.7.4