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 --- drivers/video/ipu_disp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/video/ipu_disp.c b/drivers/video/ipu_disp.c index 2e91356..22ac142 100644 --- a/drivers/video/ipu_disp.c +++ b/drivers/video/ipu_disp.c @@ -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;
}