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video: ipu_disp: Fix clock polarity logic

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Currently the HDMI splash screen image quality on mx6solo does not show a
very stable image.

By comparing the IPU driver from U-boot with the one from FSL 4.1.0 BSP,
we can see that there is an inverted logic for setting the DI_GEN_POL_CLK bit.

>From FSL BSP [1] we have:

	if (!sig.clk_pol)
		di_gen |= DI_GEN_POLARITY_DISP_CLK;

Applying the same logic into U-boot fixes the HDMI image stability.

[1] git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/drivers/mxc/ipu3/ipu_disp.c?h=imx_3.0.35_4.1.0

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Tested-by: Eric Nelson <eric.nelson@boundarydevices.com>
Acked-by: Eric Nelson <eric.nelson@boundarydevices.com>
Acked-by: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Fabio Estevam 2013-10-29 15:46:21 -02:00 committed by Anatolij Gustschin
parent 7e575c46c3
commit 2740e5de4f
1 changed files with 1 additions and 1 deletions
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2
drivers/video/ipu_disp.c
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@ -1178,7 +1178,7 @@ int32_t ipu_init_sync_panel(int disp, uint32_t pixel_clk,
if (sig.Vsync_pol)
di_gen |= DI_GEN_POLARITY_3;
if (sig.clk_pol)
if (!sig.clk_pol)
di_gen |= DI_GEN_POL_CLK;
}