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SubjectRe: [PATCH 1/1] clk: imx6: refine hdmi_isfr's parent to make HDMI work on i.MX6 SoCs w/o VPU
On Tue, Aug 1, 2017 at 7:40 AM, Sébastien Szymanski
<sebastien.szymanski@armadeus.com> wrote:
> On i.MX6 SoCs without VPU (in my case MCIMX6D4AVT10AC), the hdmi driver
> fails to probe:
>
> [ 2.540030] dwhdmi-imx 120000.hdmi: Unsupported HDMI controller
> (0000:00:00)
> [ 2.548199] imx-drm display-subsystem: failed to bind 120000.hdmi
> (ops dw_hdmi_imx_ops): -19
> [ 2.557403] imx-drm display-subsystem: master bind failed: -19
>
> That's because hdmi_isfr's parent, video_27m, is not correctly ungated.
> As explained in commit 5ccc248cc537 ("ARM: imx6q: clk: Add support for
> mipi_core_cfg clock as a shared clock gate"), video_27m is gated by
> CCM_CCGR3[CG8].
>
> On i.MX6 SoCs with VPU, the hdmi is working thanks to the
> CCM_CMEOR[mod_en_ov_vpu] bit which makes the video_27m ungated whatever
> is in CCM_CCGR3[CG8]. The issue can be reproduced by setting
> CCMEOR[mod_en_ov_vpu] to 0.
>
> Make the HDMI work in every case by setting hdmi_isfr's parent to
> mipi_core_cfg.
>
> Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>

Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>

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