[PATCH 6/8] drm/sun4i: Add initial LVDS stub

Priit Laes
2017-02-11T17:44:03Z

Signed-off-by: Priit Laes <plaes-q/aMd4JkU83YtjvyW6yDsg@public.gmane.org>
---
drivers/gpu/drm/sun4i/Makefile | 1 +
drivers/gpu/drm/sun4i/sun4i_lvds.c | 247 +++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/sun4i/sun4i_lvds.h | 15 +++
3 files changed, 263 insertions(+)
create mode 100644 drivers/gpu/drm/sun4i/sun4i_lvds.c
create mode 100644 drivers/gpu/drm/sun4i/sun4i_lvds.h

diff --git a/drivers/gpu/drm/sun4i/Makefile b/drivers/gpu/drm/sun4i/Makefile
index d625a82..5dfbe16 100644
--- a/drivers/gpu/drm/sun4i/Makefile
+++ b/drivers/gpu/drm/sun4i/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_DRM_SUN4I) += sun4i-drm.o sun4i-tcon.o
obj-$(CONFIG_DRM_SUN4I) += sun4i_backend.o
obj-$(CONFIG_DRM_SUN4I) += sun6i_drc.o
obj-$(CONFIG_DRM_SUN4I) += sun4i_tv.o
+obj-$(CONFIG_DRM_SUN4I) += sun4i_lvds.o
diff --git a/drivers/gpu/drm/sun4i/sun4i_lvds.c b/drivers/gpu/drm/sun4i/sun4i_lvds.c
new file mode 100644
index 0000000..2ba4705
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun4i_lvds.c
@@ -0,0 +1,247 @@
+/*
+ * Copyright (C) 2016 Priit Laes
+ *
+ * Priit Laes <plaes-q/aMd4JkU83YtjvyW6yDsg@public.gmane.org>
+ *
+ * Based on sun4i_rgb.c by Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
+ *
+ * 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/clk.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_panel.h>
+
+#include "sun4i_drv.h"
+#include "sun4i_tcon.h"
+
+struct sun4i_lvds {
+ struct drm_connector connector;
+ struct drm_encoder encoder;
+
+ struct sun4i_drv *drv;
+};
+
+static inline struct sun4i_lvds *
+drm_connector_to_sun4i_lvds(struct drm_connector *connector)
+{
+ return container_of(connector, struct sun4i_lvds,
+ connector);
+}
+
+static inline struct sun4i_lvds *
+drm_encoder_to_sun4i_lvds(struct drm_encoder *encoder)
+{
+ return container_of(encoder, struct sun4i_lvds,
+ encoder);
+}
+
+static int sun4i_lvds_get_modes(struct drm_connector *connector)
+{
+ struct sun4i_lvds *lvds =
+ drm_connector_to_sun4i_lvds(connector);
+ struct sun4i_drv *drv = lvds->drv;
+ struct sun4i_tcon *tcon = drv->tcon;
+
+ return drm_panel_get_modes(tcon->panel);
+}
+
+static int sun4i_lvds_mode_valid(struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ DRM_DEBUG_DRIVER("LVDS mode valid!\n");
+ return MODE_OK;
+}
+
+static struct drm_connector_helper_funcs sun4i_lvds_con_helper_funcs = {
+ .get_modes = sun4i_lvds_get_modes,
+ .mode_valid = sun4i_lvds_mode_valid,
+};
+
+static enum drm_connector_status
+sun4i_lvds_connector_detect(struct drm_connector *connector, bool force)
+{
+ return connector_status_connected;
+}
+
+static void
+sun4i_lvds_connector_destroy(struct drm_connector *connector)
+{
+ struct sun4i_lvds *lvds = drm_connector_to_sun4i_lvds(connector);
+ struct sun4i_drv *drv = lvds->drv;
+ struct sun4i_tcon *tcon = drv->tcon;
+
+ drm_panel_detach(tcon->panel);
+ drm_connector_cleanup(connector);
+}
+
+static struct drm_connector_funcs sun4i_lvds_con_funcs = {
+ .dpms = drm_atomic_helper_connector_dpms,
+ .detect = sun4i_lvds_connector_detect,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = sun4i_lvds_connector_destroy,
+ .reset = drm_atomic_helper_connector_reset,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int sun4i_lvds_atomic_check(struct drm_encoder *encoder,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state)
+{
+ return 0;
+}
+
+static void sun4i_lvds_encoder_enable(struct drm_encoder *encoder)
+{
+ struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder);
+ struct sun4i_drv *drv = lvds->drv;
+ struct sun4i_tcon *tcon = drv->tcon;
+
+ DRM_DEBUG_DRIVER("Enabling LVDS output\n");
+
+ if (!IS_ERR(tcon->panel)) {
+ drm_panel_prepare(tcon->panel);
+ drm_panel_enable(tcon->panel);
+ }
+
+ /* encoder->bridge can be NULL; drm_bridge_enable checks for it */
+ drm_bridge_enable(encoder->bridge);
+
+ sun4i_tcon_channel_enable(tcon, 0);
+}
+
+static void sun4i_lvds_encoder_disable(struct drm_encoder *encoder)
+{
+ struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder);
+ struct sun4i_drv *drv = lvds->drv;
+ struct sun4i_tcon *tcon = drv->tcon;
+
+ DRM_DEBUG_DRIVER("Disabling LVDS output\n");
+
+ sun4i_tcon_channel_disable(tcon, 0);
+
+ /* encoder->bridge can be NULL; drm_bridge_disable checks for it */
+ drm_bridge_disable(encoder->bridge);
+
+ if (!IS_ERR(tcon->panel)) {
+ drm_panel_disable(tcon->panel);
+ drm_panel_unprepare(tcon->panel);
+ }
+}
+
+static void sun4i_lvds_encoder_mode_set(struct drm_encoder *encoder,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder);
+ struct sun4i_drv *drv = lvds->drv;
+ struct sun4i_tcon *tcon = drv->tcon;
+
+ sun4i_tcon0_mode_set(tcon, mode, DRM_MODE_ENCODER_LVDS);
+
+ clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
+
+ /* FIXME: This seems to be board specific */
+ clk_set_phase(tcon->dclk, 60);
+}
+
+static struct drm_encoder_helper_funcs sun4i_lvds_enc_helper_funcs = {
+ .atomic_check = sun4i_lvds_atomic_check,
+ .mode_set = sun4i_lvds_encoder_mode_set,
+ .disable = sun4i_lvds_encoder_disable,
+ .enable = sun4i_lvds_encoder_enable,
+};
+
+static void sun4i_lvds_enc_destroy(struct drm_encoder *encoder)
+{
+ drm_encoder_cleanup(encoder);
+}
+
+static struct drm_encoder_funcs sun4i_lvds_enc_funcs = {
+ .destroy = sun4i_lvds_enc_destroy,
+};
+
+int sun4i_lvds_init(struct drm_device *drm)
+{
+ struct sun4i_drv *drv = drm->dev_private;
+ struct sun4i_tcon *tcon = drv->tcon;
+ struct drm_encoder *encoder;
+ struct sun4i_lvds *lvds;
+ int ret;
+
+ lvds = devm_kzalloc(drm->dev, sizeof(*lvds), GFP_KERNEL);
+ if (!lvds)
+ return -ENOMEM;
+ lvds->drv = drv;
+ encoder = &lvds->encoder;
+
+ tcon->panel = sun4i_tcon_find_panel(tcon->dev->of_node);
+ encoder->bridge = sun4i_tcon_find_bridge(tcon->dev->of_node);
+ if (IS_ERR(tcon->panel) && IS_ERR(encoder->bridge)) {
+ dev_info(drm->dev, "No panel or bridge found... LVDS output disabled\n");
+ return 0;
+ }
+
+ drm_encoder_helper_add(&lvds->encoder,
+ &sun4i_lvds_enc_helper_funcs);
+ ret = drm_encoder_init(drm,
+ &lvds->encoder,
+ &sun4i_lvds_enc_funcs,
+ DRM_MODE_ENCODER_NONE,
+ NULL);
+ if (ret) {
+ dev_err(drm->dev, "Couldn't initialise the LVDS encoder\n");
+ goto err_out;
+ }
+
+ /* Hardcode to TCON channel 0 */
+ lvds->encoder.possible_crtcs = BIT(0);
+
+ if (!IS_ERR(tcon->panel)) {
+ drm_connector_helper_add(&lvds->connector,
+ &sun4i_lvds_con_helper_funcs);
+ ret = drm_connector_init(drm, &lvds->connector,
+ &sun4i_lvds_con_funcs,
+ DRM_MODE_CONNECTOR_LVDS);
+ if (ret) {
+ dev_err(drm->dev, "Couldn't initialise the LVDS connector\n");
+ goto err_cleanup_connector;
+ }
+
+ drm_mode_connector_attach_encoder(&lvds->connector,
+ &lvds->encoder);
+
+ ret = drm_panel_attach(tcon->panel, &lvds->connector);
+ if (ret) {
+ dev_err(drm->dev, "Couldn't attach our panel\n");
+ goto err_cleanup_connector;
+ }
+ }
+
+ if (!IS_ERR(encoder->bridge)) {
+ encoder->bridge->encoder = &lvds->encoder;
+
+ ret = drm_bridge_attach(drm, encoder->bridge);
+ if (ret) {
+ dev_err(drm->dev, "Couldn't attach our bridge\n");
+ goto err_cleanup_connector;
+ }
+ } else {
+ encoder->bridge = NULL;
+ }
+
+ return 0;
+
+err_cleanup_connector:
+ drm_encoder_cleanup(&lvds->encoder);
+err_out:
+ return ret;
+}
+EXPORT_SYMBOL(sun4i_lvds_init);
diff --git a/drivers/gpu/drm/sun4i/sun4i_lvds.h b/drivers/gpu/drm/sun4i/sun4i_lvds.h
new file mode 100644
index 0000000..1fc9646
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun4i_lvds.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2016 Priit Laes <plaes-q/aMd4JkU83YtjvyW6yDsg@public.gmane.org>
+ *
+ * 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.
+ */
+
+#ifndef _SUN4I_LVDS_H_
+#define _SUN4I_LVDS_H_
+
+int sun4i_lvds_init(struct drm_device *drm);
+
+#endif /* _SUN4I_LVDS_H_ */
--
2.9.3