drm/i915: initialize DDI buffer translations
DDI is introduced starting with Haswell GPU generation. So to simplify its
management in the future, we also add intel_ddi.c to hold all the
DDI-related items.
Buffer translations for DDI links must be initialized prior to enablement.
For FDI and DP, first 9 pairs of values are used to select the connection
parameters. HDMI uses the last pair of values and ignores the first 9
pairs. So we program HDMI values in both cases, which allows HDMI to work
over both FDI and DP-friendly buffers.
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
new file mode 100644
index 0000000..08f210b
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright © 2012 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ * Eugeni Dodonov <eugeni.dodonov@intel.com>
+ *
+ */
+
+#include "i915_drv.h"
+#include "intel_drv.h"
+
+/* HDMI/DVI modes ignore everything but the last 2 items. So we share
+ * them for both DP and FDI transports, allowing those ports to
+ * automatically adapt to HDMI connections as well
+ */
+static const u32 hsw_ddi_translations_dp[] = {
+ 0x00FFFFFF, 0x0006000E, /* DP parameters */
+ 0x00D75FFF, 0x0005000A,
+ 0x00C30FFF, 0x00040006,
+ 0x80AAAFFF, 0x000B0000,
+ 0x00FFFFFF, 0x0005000A,
+ 0x00D75FFF, 0x000C0004,
+ 0x80C30FFF, 0x000B0000,
+ 0x00FFFFFF, 0x00040006,
+ 0x80D75FFF, 0x000B0000,
+ 0x00FFFFFF, 0x00040006 /* HDMI parameters */
+};
+
+static const u32 hsw_ddi_translations_fdi[] = {
+ 0x00FFFFFF, 0x0007000E, /* FDI parameters */
+ 0x00D75FFF, 0x000F000A,
+ 0x00C30FFF, 0x00060006,
+ 0x00AAAFFF, 0x001E0000,
+ 0x00FFFFFF, 0x000F000A,
+ 0x00D75FFF, 0x00160004,
+ 0x00C30FFF, 0x001E0000,
+ 0x00FFFFFF, 0x00060006,
+ 0x00D75FFF, 0x001E0000,
+ 0x00FFFFFF, 0x00040006 /* HDMI parameters */
+};
+
+/* On Haswell, DDI port buffers must be programmed with correct values
+ * in advance. The buffer values are different for FDI and DP modes,
+ * but the HDMI/DVI fields are shared among those. So we program the DDI
+ * in either FDI or DP modes only, as HDMI connections will work with both
+ * of those
+ */
+void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port, bool use_fdi_mode)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ u32 reg;
+ int i;
+ const u32 *ddi_translations = ((use_fdi_mode) ?
+ hsw_ddi_translations_fdi :
+ hsw_ddi_translations_dp);
+
+ DRM_DEBUG_DRIVER("Initializing DDI buffers for port %c in %s mode\n",
+ port_name(port),
+ use_fdi_mode ? "FDI" : "DP");
+
+ WARN((use_fdi_mode && (port != PORT_E)),
+ "Programming port %c in FDI mode, this probably will not work.\n",
+ port_name(port));
+
+ for (i=0, reg=DDI_BUF_TRANS(port); i < ARRAY_SIZE(hsw_ddi_translations_fdi); i++) {
+ I915_WRITE(reg, ddi_translations[i]);
+ reg += 4;
+ }
+}
+
+/* Program DDI buffers translations for DP. By default, program ports A-D in DP
+ * mode and port E for FDI.
+ */
+void intel_prepare_ddi(struct drm_device *dev)
+{
+ int port;
+
+ if (IS_HASWELL(dev)) {
+ for (port = PORT_A; port < PORT_E; port++)
+ intel_prepare_ddi_buffers(dev, port, false);
+
+ /* DDI E is the suggested one to work in FDI mode, so program is as such by
+ * default. It will have to be re-programmed in case a digital DP output
+ * will be detected on it
+ */
+ intel_prepare_ddi_buffers(dev, PORT_E, true);
+ }
+}