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    Subject[PATCH v3 04/14] drm/sun4i: tcon: Add support for demuxing TCON output on A31
    Date
    On systems with 2 TCONs such as the A31, it is possible to demux the
    output of the TCONs to one encoder.

    Add support for this for the A31.

    Signed-off-by: Chen-Yu Tsai <wens@csie.org>
    ---
    drivers/gpu/drm/sun4i/sun4i_tcon.c | 38 ++++++++++++++++++++++++++++++++++++++
    1 file changed, 38 insertions(+)

    diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
    index 7bf51abaee97..c949309d4285 100644
    --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
    +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
    @@ -112,6 +112,21 @@ void sun4i_tcon_enable_vblank(struct sun4i_tcon *tcon, bool enable)
    }
    EXPORT_SYMBOL(sun4i_tcon_enable_vblank);

    +static struct sun4i_tcon *sun4i_get_first_tcon(struct drm_device *drm)
    +{
    + struct sun4i_drv *drv = drm->dev_private;
    + struct sun4i_tcon *tcon;
    +
    + list_for_each_entry(tcon, &drv->tcon_list, list)
    + if (tcon->id == 0)
    + return tcon;
    +
    + dev_warn(drm->dev,
    + "TCON0 not found, display output muxing may not work\n");
    +
    + return tcon;
    +}
    +
    void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel,
    struct drm_encoder *encoder)
    {
    @@ -777,6 +792,28 @@ static int sun5i_a13_tcon_set_mux(struct sun4i_tcon *tcon,
    return regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, val);
    }

    +static int sun6i_tcon_set_mux(struct sun4i_tcon *tcon,
    + struct drm_encoder *encoder)
    +{
    + struct sun4i_tcon *tcon0 = sun4i_get_first_tcon(encoder->dev);
    + u32 shift;
    +
    + switch (encoder->encoder_type) {
    + case DRM_MODE_ENCODER_TMDS:
    + /* HDMI */
    + shift = 8;
    + break;
    + default:
    + /* TODO A31 has MIPI DSI but A31s does not */
    + return -EINVAL;
    + }
    +
    + regmap_update_bits(tcon0->regs, SUN4I_TCON_MUX_CTRL_REG,
    + 0x3 << shift, tcon->id << shift);
    +
    + return 0;
    +}
    +
    static const struct sun4i_tcon_quirks sun5i_a13_quirks = {
    .has_unknown_mux = true,
    .has_channel_1 = true,
    @@ -786,6 +823,7 @@ static const struct sun4i_tcon_quirks sun5i_a13_quirks = {
    static const struct sun4i_tcon_quirks sun6i_a31_quirks = {
    .has_channel_1 = true,
    .needs_de_be_mux = true,
    + .set_mux = sun6i_tcon_set_mux,
    };

    static const struct sun4i_tcon_quirks sun6i_a31s_quirks = {
    --
    2.14.2
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