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Subject[PATCH v3 03/14] drm/sun4i: tcon: Add variant callback for TCON output muxing
Date
Different SoCs have different muxing options and values for the TCON
outputs. Instead of stuffing every possibility in sun4i_tcon_set_mux(),
add a callback pointer to sun4i_tcon_quirks that each TCON variant
can use to provide muxing support.

The current muxing options in sun4i_tcon_set_mux() for sun5i-a13 are
moved to a new sun5i-specific callback function.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
---
drivers/gpu/drm/sun4i/sun4i_tcon.c | 45 ++++++++++++++++++++++++--------------
drivers/gpu/drm/sun4i/sun4i_tcon.h | 5 +++++
2 files changed, 33 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index e853dfe51389..7bf51abaee97 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>
@@ -112,23 +115,13 @@ EXPORT_SYMBOL(sun4i_tcon_enable_vblank);
void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel,
struct drm_encoder *encoder)
{
- u32 val;
-
- if (!tcon->quirks->has_unknown_mux)
- return;
+ int ret = -ENOTSUPP;

- if (channel != 1)
- return;
-
- if (encoder->encoder_type == DRM_MODE_ENCODER_TVDAC)
- val = 1;
- else
- val = 0;
+ if (tcon->quirks->set_mux)
+ ret = tcon->quirks->set_mux(tcon, encoder);

- /*
- * FIXME: Undocumented bits
- */
- regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, val);
+ DRM_DEBUG_DRIVER("Muxing encoder %s to CRTC %s: %d\n",
+ encoder->name, encoder->crtc->name, ret);
}
EXPORT_SYMBOL(sun4i_tcon_set_mux);

@@ -767,9 +760,27 @@ static int sun4i_tcon_remove(struct platform_device *pdev)
return 0;
}

+/* platform specific TCON muxing callbacks */
+static int sun5i_a13_tcon_set_mux(struct sun4i_tcon *tcon,
+ struct drm_encoder *encoder)
+{
+ u32 val;
+
+ if (encoder->encoder_type == DRM_MODE_ENCODER_TVDAC)
+ val = 1;
+ else
+ val = 0;
+
+ /*
+ * FIXME: Undocumented bits
+ */
+ return regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, val);
+}
+
static const struct sun4i_tcon_quirks sun5i_a13_quirks = {
- .has_unknown_mux = true,
- .has_channel_1 = true,
+ .has_unknown_mux = true,
+ .has_channel_1 = true,
+ .set_mux = sun5i_a13_tcon_set_mux,
};

static const struct sun4i_tcon_quirks sun6i_a31_quirks = {
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.h b/drivers/gpu/drm/sun4i/sun4i_tcon.h
index 5a219d1ccc26..6e699cbcf768 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.h
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.h
@@ -145,10 +145,15 @@

#define SUN4I_TCON_MAX_CHANNELS 2

+struct sun4i_tcon;
+
struct sun4i_tcon_quirks {
bool has_unknown_mux; /* sun5i has undocumented mux */
bool has_channel_1; /* a33 does not have channel 1 */
bool needs_de_be_mux; /* sun6i needs mux to select backend */
+
+ /* callback to handle tcon muxing options */
+ int (*set_mux)(struct sun4i_tcon *, struct drm_encoder *);
};

struct sun4i_tcon {
--
2.14.2
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