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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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