Peppy/Haswell: move more support functions from mainboard to the intel i915 driver

Move (and rename to make it clearer) the function that computes display
parameters from the dpcd and edid.

Change-Id: Idfbb56fd312b23c742c52abca1a34ae117a8fece
Signed-off-by: Ronald G. Minnich <rminnich@google.com>
Reviewed-on: https://chromium-review.googlesource.com/171366
Reviewed-by: Furquan Shaikh <furquan.m.shaikh@gmail.com>
Reviewed-by: Ronald Minnich <rminnich@chromium.org>
Tested-by: Ronald Minnich <rminnich@chromium.org>
Commit-Queue: Ronald Minnich <rminnich@chromium.org>
(cherry picked from commit 8f2b3bafee7cb05db8fae1c52fc9e1ee64e5e35d)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6768
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

4 files changed, 139 insertions, 1 deletions

diff --git a/src/drivers/intel/gma/Makefile.inc b/src/drivers/intel/gma/Makefile.inc
index bea597e16b..7a1b97babb 100644
--- a/src/drivers/intel/gma/Makefile.inc
+++ b/src/drivers/intel/gma/Makefile.inc
@@ -17,6 +17,6 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 ##
 
-ramstage-$(CONFIG_INTEL_DP) += intel_dp.c drm_dp_helper.c
+ramstage-$(CONFIG_INTEL_DP) += intel_dp.c drm_dp_helper.c display.c
 ramstage-$(CONFIG_INTEL_DDI) += intel_ddi.c
 ramstage-$(CONFIG_INTEL_EDID) += edid.c
diff --git a/src/drivers/intel/gma/display.c b/src/drivers/intel/gma/display.c
new file mode 100644
index 0000000000..5c8e886469
--- /dev/null
+++ b/src/drivers/intel/gma/display.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * 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:
+ *    Keith Packard <keithp@keithp.com>
+ *
+ */
+
+/* This code was created by the coccinnelle filters in the i915tool,
+ * with some final hand filtering.
+ */
+
+#include <console/console.h>
+#include <stdint.h>
+#include <delay.h>
+#include <drivers/intel/gma/i915.h>
+#include <string.h>
+
+void compute_display_params(struct intel_dp *dp)
+{
+	struct edid *edid = &(dp->edid);
+
+	/* step 1: get the constants in the dp struct set up. */
+	dp->lane_count = dp->dpcd[DP_MAX_LANE_COUNT]&DP_LANE_COUNT_MASK;
+
+	dp->link_bw = dp->dpcd[DP_MAX_LINK_RATE];
+	dp->clock = intel_dp_bw_code_to_link_rate(dp->link_bw);
+	dp->edid.link_clock = intel_dp_bw_code_to_link_rate(dp->link_bw);
+
+	/* step 2. Do some computation of other stuff. */
+	dp->bytes_per_pixel = dp->pipe_bits_per_pixel/8;
+
+	dp->stride = edid->bytes_per_line;
+
+	dp->htotal = (edid->ha - 1) | ((edid->ha + edid->hbl - 1) << 16);
+
+	dp->hblank = (edid->ha - 1) | ((edid->ha + edid->hbl - 1) << 16);
+
+	dp->hsync = (edid->ha + edid->hso - 1) |
+		((edid->ha + edid->hso + edid->hspw - 1) << 16);
+
+	dp->vtotal = (edid->va - 1) | ((edid->va + edid->vbl - 1) << 16);
+
+	dp->vblank = (edid->va - 1) | ((edid->va + edid->vbl - 1) << 16);
+
+	dp->vsync = (edid->va + edid->vso - 1) |
+		((edid->va + edid->vso + edid->vspw - 1) << 16);
+
+	/* PIPEASRC is wid-1 x ht-1 */
+	dp->pipesrc = (edid->ha-1)<<16 | (edid->va-1);
+
+	dp->pfa_pos = 0;
+
+	dp->pfa_ctl = PF_ENABLE | PF_FILTER_MED_3x3;
+	/* IVB hack */
+	if (dp->gen == 6)
+		dp->pfa_ctl |= PF_PIPE_SEL_IVB(dp->pipe);
+
+	dp->pfa_sz = (edid->ha << 16) | (edid->va);
+
+	/* step 3. Call the linux code we pulled in. */
+	dp->flags = intel_ddi_calc_transcoder_flags(edid->panel_bits_per_pixel,
+						    dp->port,
+						    dp->pipe,
+						    dp->type,
+						    dp->lane_count,
+						    dp->pfa_sz,
+						    dp->edid.phsync == '+'?1:0,
+						    dp->edid.pvsync == '+'?1:0);
+
+	dp->transcoder = intel_ddi_get_transcoder(dp->port,
+						  dp->pipe);
+
+	intel_dp_compute_m_n(edid->panel_bits_per_pixel,
+			     dp->lane_count,
+			     dp->edid.pixel_clock,
+			     dp->edid.link_clock,
+			     &dp->m_n);
+
+	printk(BIOS_SPEW, "dp->lane_count  = 0x%08x\n",dp->lane_count);
+	printk(BIOS_SPEW, "dp->stride  = 0x%08x\n",dp->stride);
+	printk(BIOS_SPEW, "dp->htotal  = 0x%08x\n", dp->htotal);
+	printk(BIOS_SPEW, "dp->hblank  = 0x%08x\n", dp->hblank);
+	printk(BIOS_SPEW, "dp->hsync   = 0x%08x\n", dp->hsync);
+	printk(BIOS_SPEW, "dp->vtotal  = 0x%08x\n", dp->vtotal);
+	printk(BIOS_SPEW, "dp->vblank  = 0x%08x\n", dp->vblank);
+	printk(BIOS_SPEW, "dp->vsync   = 0x%08x\n", dp->vsync);
+	printk(BIOS_SPEW, "dp->pipesrc = 0x%08x\n", dp->pipesrc);
+	printk(BIOS_SPEW, "dp->pfa_pos = 0x%08x\n", dp->pfa_pos);
+	printk(BIOS_SPEW, "dp->pfa_ctl = 0x%08x\n", dp->pfa_ctl);
+	printk(BIOS_SPEW, "dp->pfa_sz  = 0x%08x\n", dp->pfa_sz);
+	printk(BIOS_SPEW, "dp->link_m  = 0x%08x\n", dp->m_n.link_m);
+	printk(BIOS_SPEW, "dp->link_n  = 0x%08x\n", dp->m_n.link_n);
+	printk(BIOS_SPEW, "0x6f030     = 0x%08x\n",
+	       TU_SIZE(dp->m_n.tu) | dp->m_n.gmch_m);
+	printk(BIOS_SPEW, "0x6f030     = 0x%08x\n", dp->m_n.gmch_m);
+	printk(BIOS_SPEW, "0x6f034     = 0x%08x\n", dp->m_n.gmch_n);
+	printk(BIOS_SPEW, "dp->flags   = 0x%08x\n", dp->flags);
+}
diff --git a/src/drivers/intel/gma/i915.h b/src/drivers/intel/gma/i915.h
index e8940a3b98..15a20095d4 100644
--- a/src/drivers/intel/gma/i915.h
+++ b/src/drivers/intel/gma/i915.h
@@ -242,6 +242,7 @@ enum transcoder intel_ddi_get_transcoder(enum port port,
 					 enum pipe pipe);
 
 void intel_dp_set_m_n_regs(struct intel_dp *intel_dp);
+int intel_dp_bw_code_to_link_rate(u8 link_bw);
 void intel_dp_set_resolution(struct intel_dp *intel_dp);
 
 int intel_dp_i2c_write(struct intel_dp *intel_dp,
@@ -278,3 +279,6 @@ u32 gtt_read(u32 reg);
 
 int i915lightup(unsigned int physbase, unsigned int mmio,
 		unsigned int gfx, unsigned int init_fb);
+
+/* display.c */
+void compute_display_params(struct intel_dp *dp);
diff --git a/src/drivers/intel/gma/intel_dp.c b/src/drivers/intel/gma/intel_dp.c
index 393692bd04..0a28a0b7ce 100644
--- a/src/drivers/intel/gma/intel_dp.c
+++ b/src/drivers/intel/gma/intel_dp.c
@@ -1787,6 +1787,22 @@ void intel_dp_set_m_n_regs(struct intel_dp *dp)
         gtt_write(PIPE_LINK_N1(dp->transcoder),dp->m_n.link_n);
 }
 
+int intel_dp_bw_code_to_link_rate(u8 link_bw)
+{
+	switch (link_bw) {
+        default:
+		printk(BIOS_ERR,
+			"ERROR: link_bw(%d) is bogus; must be one of 6, 0xa, or 0x14\n",
+			link_bw);
+        case DP_LINK_BW_1_62:
+		return 162000;
+        case DP_LINK_BW_2_7:
+		return 270000;
+        case DP_LINK_BW_5_4:
+                return 540000;
+	}
+}
+
 void intel_dp_set_resolution(struct intel_dp *intel_dp)
 {
         gtt_write(HTOTAL(intel_dp->transcoder),intel_dp->htotal);