diff options
Diffstat (limited to 'drivers/video/fbdev/imxfb.c')
| -rw-r--r-- | drivers/video/fbdev/imxfb.c | 15 |
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); |