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path: root/drivers/gpu/drm/msm/dp/dp_drm.c
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Diffstat (limited to 'drivers/gpu/drm/msm/dp/dp_drm.c')
-rw-r--r--drivers/gpu/drm/msm/dp/dp_drm.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
new file mode 100644
index 000000000000..764f4b81017e
--- /dev/null
+++ b/drivers/gpu/drm/msm/dp/dp_drm.c
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_crtc.h>
+
+#include "msm_drv.h"
+#include "msm_kms.h"
+#include "dp_drm.h"
+
+struct dp_connector {
+ struct drm_connector base;
+ struct msm_dp *dp_display;
+};
+#define to_dp_connector(x) container_of(x, struct dp_connector, base)
+
+/**
+ * dp_connector_detect - callback to determine if connector is connected
+ * @conn: Pointer to drm connector structure
+ * @force: Force detect setting from drm framework
+ * Returns: Connector 'is connected' status
+ */
+static enum drm_connector_status dp_connector_detect(struct drm_connector *conn,
+ bool force)
+{
+ struct msm_dp *dp;
+
+ dp = to_dp_connector(conn)->dp_display;
+
+ DRM_DEBUG_DP("is_connected = %s\n",
+ (dp->is_connected) ? "true" : "false");
+
+ return (dp->is_connected) ? connector_status_connected :
+ connector_status_disconnected;
+}
+
+/**
+ * dp_connector_get_modes - callback to add drm modes via drm_mode_probed_add()
+ * @connector: Pointer to drm connector structure
+ * Returns: Number of modes added
+ */
+static int dp_connector_get_modes(struct drm_connector *connector)
+{
+ int rc = 0;
+ struct msm_dp *dp;
+ struct dp_display_mode *dp_mode = NULL;
+ struct drm_display_mode *m, drm_mode;
+
+ if (!connector)
+ return 0;
+
+ dp = to_dp_connector(connector)->dp_display;
+
+ dp_mode = kzalloc(sizeof(*dp_mode), GFP_KERNEL);
+ if (!dp_mode)
+ return 0;
+
+ /* pluggable case assumes EDID is read when HPD */
+ if (dp->is_connected) {
+ /*
+ *The get_modes() function might return one mode that is stored
+ * in dp_mode when compliance test is in progress. If not, the
+ * return value is equal to the total number of modes supported
+ * by the sink
+ */
+ rc = dp_display_get_modes(dp, dp_mode);
+ if (rc <= 0) {
+ DRM_ERROR("failed to get DP sink modes, rc=%d\n", rc);
+ kfree(dp_mode);
+ return rc;
+ }
+ if (dp_mode->drm_mode.clock) { /* valid DP mode */
+ memset(&drm_mode, 0x0, sizeof(drm_mode));
+ drm_mode_copy(&drm_mode, &dp_mode->drm_mode);
+ m = drm_mode_duplicate(connector->dev, &drm_mode);
+ if (!m) {
+ DRM_ERROR("failed to add mode %ux%u\n",
+ drm_mode.hdisplay,
+ drm_mode.vdisplay);
+ kfree(dp_mode);
+ return 0;
+ }
+ drm_mode_probed_add(connector, m);
+ }
+ } else {
+ DRM_DEBUG_DP("No sink connected\n");
+ }
+ kfree(dp_mode);
+ return rc;
+}
+
+/**
+ * dp_connector_mode_valid - callback to determine if specified mode is valid
+ * @connector: Pointer to drm connector structure
+ * @mode: Pointer to drm mode structure
+ * Returns: Validity status for specified mode
+ */
+static enum drm_mode_status dp_connector_mode_valid(
+ struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ struct msm_dp *dp_disp;
+
+ dp_disp = to_dp_connector(connector)->dp_display;
+
+ if ((dp_disp->max_pclk_khz <= 0) ||
+ (dp_disp->max_pclk_khz > DP_MAX_PIXEL_CLK_KHZ) ||
+ (mode->clock > dp_disp->max_pclk_khz))
+ return MODE_BAD;
+
+ return dp_display_validate_mode(dp_disp, mode->clock);
+}
+
+static const struct drm_connector_funcs dp_connector_funcs = {
+ .detect = dp_connector_detect,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = drm_connector_cleanup,
+ .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 const struct drm_connector_helper_funcs dp_connector_helper_funcs = {
+ .get_modes = dp_connector_get_modes,
+ .mode_valid = dp_connector_mode_valid,
+};
+
+/* connector initialization */
+struct drm_connector *dp_drm_connector_init(struct msm_dp *dp_display)
+{
+ struct drm_connector *connector = NULL;
+ struct dp_connector *dp_connector;
+ int ret;
+
+ dp_connector = devm_kzalloc(dp_display->drm_dev->dev,
+ sizeof(*dp_connector),
+ GFP_KERNEL);
+ if (!dp_connector)
+ return ERR_PTR(-ENOMEM);
+
+ dp_connector->dp_display = dp_display;
+
+ connector = &dp_connector->base;
+
+ ret = drm_connector_init(dp_display->drm_dev, connector,
+ &dp_connector_funcs,
+ DRM_MODE_CONNECTOR_DisplayPort);
+ if (ret)
+ return ERR_PTR(ret);
+
+ drm_connector_helper_add(connector, &dp_connector_helper_funcs);
+
+ /*
+ * Enable HPD to let hpd event is handled when cable is connected.
+ */
+ connector->polled = DRM_CONNECTOR_POLL_HPD;
+
+ drm_connector_attach_encoder(connector, dp_display->encoder);
+
+ return connector;
+}