From: Anatolij Gustschin <agust@denx.de>
Date: Mon, 4 Sep 2017 21:33:45 +0000 (+0200)
Subject: video: ipuv3_fb: skip IPU shutdown if IPU was not enabled before
X-Git-Tag: v2017.09~32^2~2
X-Git-Url: https://git.librecmc.org/?p=oweals%2Fu-boot.git;a=commitdiff_plain;h=f8ba7f27740b42f17bf145d0e1e5aec66ac8dc0e

video: ipuv3_fb: skip IPU shutdown if IPU was not enabled before

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@denx.de>
---

diff --git a/drivers/video/ipu.h b/drivers/video/ipu.h
index 348be58bf6..ff91d18868 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 f8d4488fce..f259fb9633 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 0d0a0a97ff..1ab5cb7b1c 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) {