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authorHung-Te Lin <hungte@chromium.org>2014-03-05 21:09:58 +0800
committerMarc Jones <marc.jones@se-eng.com>2014-12-15 19:57:30 +0100
commitc04d3dd7b3d026be03d2acbba1585d1824b5ea82 (patch)
treea176bf2d8d35c4f0b383c7d94296c943c253b310
parent042f849ef95f6d7093f8ebc24d665b1bf6202b7d (diff)
downloadcoreboot-c04d3dd7b3d026be03d2acbba1585d1824b5ea82.tar.xz
tegra124: Add tegra_dc_i2c_aux_read to allow reading EDID.
To read EDID, we need to access I2C via DP AUX channel. BRANCH=none BUG=chrome-os-partner:25933 TEST=emerge-nyan coreboot chromeos-bootimage Original-Change-Id: I2666b5d46843485b79265a537f19bd8eab5e1a26 Original-Signed-off-by: Hung-Te Lin <hungte@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/188858 Original-Reviewed-by: Gabe Black <gabeblack@chromium.org> Original-Commit-Queue: Gabe Black <gabeblack@chromium.org> (cherry picked from commit 8f8e98ff5038b57f89332aee75573095c3933dd2) Signed-off-by: Marc Jones <marc.jones@se-eng.com> Change-Id: I5b1b6ab2940c8265483059fd94a2c4db2a41144a Reviewed-on: http://review.coreboot.org/7735 Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org> Tested-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
-rw-r--r--src/soc/nvidia/tegra124/dp.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/src/soc/nvidia/tegra124/dp.c b/src/soc/nvidia/tegra124/dp.c
index a9da269da9..e5c0632bb4 100644
--- a/src/soc/nvidia/tegra124/dp.c
+++ b/src/soc/nvidia/tegra124/dp.c
@@ -2,6 +2,7 @@
* drivers/video/tegra/dc/dp.c
*
* Copyright (c) 2011-2013, NVIDIA Corporation.
+ * Copyright 2014 Google Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
@@ -322,6 +323,46 @@ static int tegra_dc_dp_dpcd_write(struct tegra_dc_dp_data *dp, u32 cmd,
return ret;
}
+/* TODO(hungte) Change this to static when EDID parsing functions are ready. */
+int tegra_dc_i2c_aux_read(struct tegra_dc_dp_data *dp, u32 i2c_addr,
+ u8 addr, u8 *data, u32 *size, u32 *aux_stat);
+int tegra_dc_i2c_aux_read(struct tegra_dc_dp_data *dp, u32 i2c_addr,
+ u8 addr, u8 *data, u32 *size, u32 *aux_stat)
+{
+ u32 finished = 0;
+ int ret = 0;
+
+ do {
+ u32 cur_size = MIN(DP_AUX_MAX_BYTES, *size - finished);
+
+ u32 len = 1;
+ ret = tegra_dc_dpaux_write_chunk(
+ dp, DPAUX_DP_AUXCTL_CMD_I2CWR, i2c_addr,
+ &addr, &len, aux_stat);
+ if (ret) {
+ printk(BIOS_ERR, "%s: error sending address to read.\n",
+ __func__);
+ break;
+ }
+
+ ret = tegra_dc_dpaux_read_chunk(
+ dp, DPAUX_DP_AUXCTL_CMD_I2CRD, i2c_addr,
+ data, &cur_size, aux_stat);
+ if (ret) {
+ printk(BIOS_ERR, "%s: error reading data.\n", __func__);
+ break;
+ }
+
+ /* cur_size should be the real size returned */
+ addr += cur_size;
+ data += cur_size;
+ finished += cur_size;
+ } while (*size > finished);
+
+ *size = finished;
+ return ret;
+}
+
static void tegra_dc_dpaux_enable(struct tegra_dc_dp_data *dp)
{
/* clear interrupt */