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drm/sun4i: tcon: Add support for demuxing TCON output on A31

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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>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171010032008.682-3-wens@csie.org
This commit is contained in:
Chen-Yu Tsai 2017-10-10 11:19:59 +08:00 committed by Maxime Ripard
parent ad537fb2ab
commit 67e326450d
1 changed files with 47 additions and 0 deletions
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47
drivers/gpu/drm/sun4i/sun4i_tcon.c
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@ -112,6 +112,27 @@ void sun4i_tcon_enable_vblank(struct sun4i_tcon *tcon, bool enable)
}
EXPORT_SYMBOL(sun4i_tcon_enable_vblank);
/*
* This function is a helper for TCON output muxing. The TCON output
* muxing control register in earlier SoCs (without the TCON TOP block)
* are located in TCON0. This helper returns a pointer to TCON0's
* sun4i_tcon structure, or NULL if not found.
*/
static struct sun4i_tcon *sun4i_get_tcon0(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 NULL;
}
void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel,
struct drm_encoder *encoder)
{
@ -777,6 +798,31 @@ 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_tcon0(encoder->dev);
u32 shift;
if (!tcon0)
return -EINVAL;
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_channel_1 = true,
.set_mux = sun5i_a13_tcon_set_mux,
@ -785,6 +831,7 @@ 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 = {