On Thu, 2010-06-17 at 07:12 +0200, ext Nagarajan, Rajkumar wrote:
> When switching between clocks, The new functional clock is
> effective when the next vertical blanking interval occurs.
> GOLCD bit has to be set for the new clock to take effect.

Where did you encounter this problem?

> Signed-off-by: Kishore Y <kishor...@ti.com>
> Signed-off-by: Mukund Mittal <mmit...@ti.com>
> Signed-off-by: Rajkumar N <rajkumar.nagara...@ti.com>
> ---
>  drivers/video/omap2/dss/dpi.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/video/omap2/dss/dpi.c b/drivers/video/omap2/dss/dpi.c
> index 960e977..5d778d6 100644
> --- a/drivers/video/omap2/dss/dpi.c
> +++ b/drivers/video/omap2/dss/dpi.c
> @@ -214,10 +214,15 @@ void omapdss_dpi_display_disable(struct omap_dss_device 
> *dssdev)
>  
>  #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
>       dss_select_dispc_clk_source(DSS_SRC_DSS1_ALWON_FCLK);
> +     dispc_go(OMAP_DSS_CHANNEL_LCD);

I don't think GO does anything here, as the channel has already been
disabled.

> +     while   (dispc_go_busy(OMAP_DSS_CHANNEL_LCD))
> +             ;

Busy looping is not good.

>       dsi_pll_uninit();
>       dss_clk_disable(DSS_CLK_FCK2);
>  #endif
>  
> +     dispc_enable_channel(OMAP_DSS_CHANNEL_LCD, 0);
> +

The channel has already been disabled above, in
dssdev->manager->disable(dssdev->manager);

 Tomi


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