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path: root/drivers/video/fbdev/imxfb.c
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Diffstat (limited to 'drivers/video/fbdev/imxfb.c')
-rw-r--r--drivers/video/fbdev/imxfb.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/video/fbdev/imxfb.c b/drivers/video/fbdev/imxfb.c
index cee8860..bb2f1e8 100644
--- a/drivers/video/fbdev/imxfb.c
+++ b/drivers/video/fbdev/imxfb.c
@@ -902,6 +902,21 @@ static int imxfb_probe(struct platform_device *pdev)
goto failed_getclock;
}
+ /*
+ * The LCDC controller does not have an enable bit. The
+ * controller starts directly when the clocks are enabled.
+ * If the clocks are enabled when the controller is not yet
+ * programmed with proper register values (enabled at the
+ * bootloader, for example) then it just goes into some undefined
+ * state.
+ * To avoid this issue, let's enable and disable LCDC IPG clock
+ * so that we force some kind of 'reset' to the LCDC block.
+ */
+ ret = clk_prepare_enable(fbi->clk_ipg);
+ if (ret)
+ goto failed_getclock;
+ clk_disable_unprepare(fbi->clk_ipg);
+
fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(fbi->clk_ahb)) {
ret = PTR_ERR(fbi->clk_ahb);