Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpu / drm / rcar-du / rcar_du_hdmienc.c

diff --git a/kernel/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c b/kernel/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c
new file mode 100644 (file)
index 0000000..81da841
--- /dev/null
+++ b/kernel/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c
@@ -0,0 +1,168 @@
+/*
+ * R-Car Display Unit HDMI Encoder
+ *
+ * Copyright (C) 2014 Renesas Electronics Corporation
+ *
+ * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/slab.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_encoder_slave.h>
+
+#include "rcar_du_drv.h"
+#include "rcar_du_encoder.h"
+#include "rcar_du_hdmienc.h"
+#include "rcar_du_lvdsenc.h"
+
+struct rcar_du_hdmienc {
+       struct rcar_du_encoder *renc;
+       struct device *dev;
+       bool enabled;
+};
+
+#define to_rcar_hdmienc(e)     (to_rcar_encoder(e)->hdmi)
+#define to_slave_funcs(e)      (to_rcar_encoder(e)->slave.slave_funcs)
+
+static void rcar_du_hdmienc_disable(struct drm_encoder *encoder)
+{
+       struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
+       struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
+
+       if (sfuncs->dpms)
+               sfuncs->dpms(encoder, DRM_MODE_DPMS_OFF);
+
+       if (hdmienc->renc->lvds)
+               rcar_du_lvdsenc_enable(hdmienc->renc->lvds, encoder->crtc,
+                                      false);
+
+       hdmienc->enabled = false;
+}
+
+static void rcar_du_hdmienc_enable(struct drm_encoder *encoder)
+{
+       struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
+       struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
+
+       if (hdmienc->renc->lvds)
+               rcar_du_lvdsenc_enable(hdmienc->renc->lvds, encoder->crtc,
+                                      true);
+
+       if (sfuncs->dpms)
+               sfuncs->dpms(encoder, DRM_MODE_DPMS_ON);
+
+       hdmienc->enabled = true;
+}
+
+static int rcar_du_hdmienc_atomic_check(struct drm_encoder *encoder,
+                                       struct drm_crtc_state *crtc_state,
+                                       struct drm_connector_state *conn_state)
+{
+       struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
+       struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
+       struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
+       const struct drm_display_mode *mode = &crtc_state->mode;
+
+       /* The internal LVDS encoder has a clock frequency operating range of
+        * 30MHz to 150MHz. Clamp the clock accordingly.
+        */
+       if (hdmienc->renc->lvds)
+               adjusted_mode->clock = clamp(adjusted_mode->clock,
+                                            30000, 150000);
+
+       if (sfuncs->mode_fixup == NULL)
+               return 0;
+
+       return sfuncs->mode_fixup(encoder, mode, adjusted_mode) ? 0 : -EINVAL;
+}
+
+static void rcar_du_hdmienc_mode_set(struct drm_encoder *encoder,
+                                    struct drm_display_mode *mode,
+                                    struct drm_display_mode *adjusted_mode)
+{
+       struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
+       struct drm_encoder_slave_funcs *sfuncs = to_slave_funcs(encoder);
+
+       if (sfuncs->mode_set)
+               sfuncs->mode_set(encoder, mode, adjusted_mode);
+
+       rcar_du_crtc_route_output(encoder->crtc, hdmienc->renc->output);
+}
+
+static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
+       .mode_set = rcar_du_hdmienc_mode_set,
+       .disable = rcar_du_hdmienc_disable,
+       .enable = rcar_du_hdmienc_enable,
+       .atomic_check = rcar_du_hdmienc_atomic_check,
+};
+
+static void rcar_du_hdmienc_cleanup(struct drm_encoder *encoder)
+{
+       struct rcar_du_hdmienc *hdmienc = to_rcar_hdmienc(encoder);
+
+       if (hdmienc->enabled)
+               rcar_du_hdmienc_disable(encoder);
+
+       drm_encoder_cleanup(encoder);
+       put_device(hdmienc->dev);
+}
+
+static const struct drm_encoder_funcs encoder_funcs = {
+       .destroy = rcar_du_hdmienc_cleanup,
+};
+
+int rcar_du_hdmienc_init(struct rcar_du_device *rcdu,
+                        struct rcar_du_encoder *renc, struct device_node *np)
+{
+       struct drm_encoder *encoder = rcar_encoder_to_drm_encoder(renc);
+       struct drm_i2c_encoder_driver *driver;
+       struct i2c_client *i2c_slave;
+       struct rcar_du_hdmienc *hdmienc;
+       int ret;
+
+       hdmienc = devm_kzalloc(rcdu->dev, sizeof(*hdmienc), GFP_KERNEL);
+       if (hdmienc == NULL)
+               return -ENOMEM;
+
+       /* Locate the slave I2C device and driver. */
+       i2c_slave = of_find_i2c_device_by_node(np);
+       if (!i2c_slave || !i2c_get_clientdata(i2c_slave))
+               return -EPROBE_DEFER;
+
+       hdmienc->dev = &i2c_slave->dev;
+
+       if (hdmienc->dev->driver == NULL) {
+               ret = -EPROBE_DEFER;
+               goto error;
+       }
+
+       /* Initialize the slave encoder. */
+       driver = to_drm_i2c_encoder_driver(to_i2c_driver(hdmienc->dev->driver));
+       ret = driver->encoder_init(i2c_slave, rcdu->ddev, &renc->slave);
+       if (ret < 0)
+               goto error;
+
+       ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
+                              DRM_MODE_ENCODER_TMDS);
+       if (ret < 0)
+               goto error;
+
+       drm_encoder_helper_add(encoder, &encoder_helper_funcs);
+
+       renc->hdmi = hdmienc;
+       hdmienc->renc = renc;
+
+       return 0;
+
+error:
+       put_device(hdmienc->dev);
+       return ret;
+}