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 <w...@csie.org>
---
drivers/gpu/drm/sun4i/sun4i_tcon.c | 61 ++++++++++++++++++++++++++++++++++++++
1 file changed, 61 insertions(+)
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c
b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index e853dfe51389..770b843a6fa9 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -14,9 +14,12 @@
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
+#include <drm/drm_encoder.h>
#include <drm/drm_modes.h>
#include <drm/drm_of.h>
+#include <uapi/drm/drm_mode.h>
+
#include <linux/component.h>
#include <linux/ioport.h>
#include <linux/of_address.h>
@@ -109,11 +112,69 @@ 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;
+}
+
+static int _sun6i_tcon_set_mux(struct drm_encoder *encoder)
+{
+ struct sun4i_tcon *tcon = sun4i_get_first_tcon(encoder->dev);
+ int tcon_id = drm_crtc_to_sun4i_crtc(encoder->crtc)->tcon->id;
+ u32 shift;
+
+ DRM_DEBUG_DRIVER("Muxing encoder %s to CRTC %s (TCON %d)\n",
+ encoder->name, encoder->crtc->name, tcon_id);
+
+ /* Only 2 TCONs */
+ if (tcon_id >= 2)
+ return -EINVAL;
+
+ switch (encoder->encoder_type) {
+ case DRM_MODE_ENCODER_TMDS:
+ /* HDMI */
+ shift = 8;
+ break;
+ case DRM_MODE_ENCODER_DSI:
+ /* No MIPI DSI on A31s */
+ if (of_device_is_compatible(tcon->dev->of_node,
+ "allwinner,sun6i-a31s-tcon"))
+ return -EINVAL;
+ shift = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ regmap_update_bits(tcon->regs, SUN4I_TCON_MUX_CTRL_REG,
+ 0x3 << shift, tcon_id << shift);
+
+ return 0;
+}
+
void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel,
struct drm_encoder *encoder)
{
+ /* Get the device node of the display engine */
+ struct device_node *node = encoder->dev->dev->of_node;
u32 val;
+ if (of_device_is_compatible(node, "allwinner,sun6i-a31-display-engine")
||
+ of_device_is_compatible(node,
"allwinner,sun6i-a31s-display-engine")) {
+ _sun6i_tcon_set_mux(encoder);
+ return;
+ }
+
if (!tcon->quirks->has_unknown_mux)
return;
--
2.14.1
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