* Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx> [131116 05:25]:
> On Device Tree boot the VDDS_DSI regulator is not linked to
> the DPI device so omapfb driver probing fails with:
>
> [ 3.186035] OMAPFB: omapfb_probe
> [ 3.190704] omapdss DPI error: can't get VDDS_DSI regulator
> [ 3.196594] omapfb omapfb: failed to connect default display
> [ 3.202667] omapfb omapfb: failed to init overlay connections
> [ 3.208892] OMAPFB: free_resources
> [ 3.212493] OMAPFB: free all fbmem
> [ 3.216735] omapfb omapfb: failed to setup omapfb
>
> As a workaround try to use the VPLL2 regulator from twl4030 in
> dpi_init_regulator() if getting the VDDS_DSI regulator fails.
Probably makes sens to fix this in the dpi.c, but this can also be set
in the .dts file. I just set up the following in the omap3-ldp.dts file:
&vaux1 {
/* Needed for ads7846 */
regulator-name = "vcc";
};
&vpll2 {
/* Needed for DSS */
regulator-name = "vdds_dsi";
};
Regards,
Tony
> Signed-off-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx>
> ---
> drivers/video/omap2/dss/dpi.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/video/omap2/dss/dpi.c b/drivers/video/omap2/dss/dpi.c
> index bd48cde..e328f0b 100644
> --- a/drivers/video/omap2/dss/dpi.c
> +++ b/drivers/video/omap2/dss/dpi.c
> @@ -550,6 +550,11 @@ static int dpi_init_regulator(void)
> return 0;
>
> vdds_dsi = devm_regulator_get(&dpi.pdev->dev, "vdds_dsi");
> +
> + /* DT HACK: try VPLL2 to make omapdss work for OMAP3 IGEPv2 */
> + if (IS_ERR(vdds_dsi))
> + vdds_dsi = devm_regulator_get(&dpi.pdev->dev, "VPLL2");
> +
> if (IS_ERR(vdds_dsi)) {
> DSSERR("can't get VDDS_DSI regulator\n");
> return PTR_ERR(vdds_dsi);
> --
> 1.8.4.2
>
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