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path: root/drivers/gpu/drm/tidss/tidss_encoder.c
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Diffstat (limited to 'drivers/gpu/drm/tidss/tidss_encoder.c')
-rw-r--r--drivers/gpu/drm/tidss/tidss_encoder.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tidss/tidss_encoder.c b/drivers/gpu/drm/tidss/tidss_encoder.c
new file mode 100644
index 000000000000..83785b0a66a9
--- /dev/null
+++ b/drivers/gpu/drm/tidss/tidss_encoder.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
+ */
+
+#include <linux/export.h>
+
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_of.h>
+
+#include "tidss_crtc.h"
+#include "tidss_drv.h"
+#include "tidss_encoder.h"
+
+static int tidss_encoder_atomic_check(struct drm_encoder *encoder,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state)
+{
+ struct drm_device *ddev = encoder->dev;
+ struct tidss_crtc_state *tcrtc_state = to_tidss_crtc_state(crtc_state);
+ struct drm_display_info *di = &conn_state->connector->display_info;
+ struct drm_bridge *bridge;
+ bool bus_flags_set = false;
+
+ dev_dbg(ddev->dev, "%s\n", __func__);
+
+ /*
+ * Take the bus_flags from the first bridge that defines
+ * bridge timings, or from the connector's display_info if no
+ * bridge defines the timings.
+ */
+ drm_for_each_bridge_in_chain(encoder, bridge) {
+ if (!bridge->timings)
+ continue;
+
+ tcrtc_state->bus_flags = bridge->timings->input_bus_flags;
+ bus_flags_set = true;
+ break;
+ }
+
+ if (!di->bus_formats || di->num_bus_formats == 0) {
+ dev_err(ddev->dev, "%s: No bus_formats in connected display\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ // XXX any cleaner way to set bus format and flags?
+ tcrtc_state->bus_format = di->bus_formats[0];
+ if (!bus_flags_set)
+ tcrtc_state->bus_flags = di->bus_flags;
+
+ return 0;
+}
+
+static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
+ .atomic_check = tidss_encoder_atomic_check,
+};
+
+static const struct drm_encoder_funcs encoder_funcs = {
+ .destroy = drm_encoder_cleanup,
+};
+
+struct drm_encoder *tidss_encoder_create(struct tidss_device *tidss,
+ u32 encoder_type, u32 possible_crtcs)
+{
+ struct drm_encoder *enc;
+ int ret;
+
+ enc = devm_kzalloc(tidss->dev, sizeof(*enc), GFP_KERNEL);
+ if (!enc)
+ return ERR_PTR(-ENOMEM);
+
+ enc->possible_crtcs = possible_crtcs;
+
+ ret = drm_encoder_init(&tidss->ddev, enc, &encoder_funcs,
+ encoder_type, NULL);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ drm_encoder_helper_add(enc, &encoder_helper_funcs);
+
+ dev_dbg(tidss->dev, "Encoder create done\n");
+
+ return enc;
+}