Vladimir Serbinenko (phcoder@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/5278
-gerrit
commit 3fb118f00ac39bcc232f7ead41693d6697a851e8 Author: Vladimir Serbinenko phcoder@gmail.com Date: Fri Feb 21 07:21:00 2014 +0100
drivers/intel/gma: Add EDID retrieving functions.
Change-Id: I64f2fcc5ad52d6a0188d02b28769001ada718c4f Signed-off-by: Vladimir Serbinenko phcoder@gmail.com --- src/drivers/intel/Makefile.inc | 2 +- src/drivers/intel/gma/Kconfig | 4 ++ src/drivers/intel/gma/Makefile.inc | 2 +- src/drivers/intel/gma/edid.c | 80 ++++++++++++++++++++++++++++++++++++++ src/drivers/intel/gma/edid.h | 1 + 5 files changed, 87 insertions(+), 2 deletions(-)
diff --git a/src/drivers/intel/Makefile.inc b/src/drivers/intel/Makefile.inc index 82d5449..eb8617c 100644 --- a/src/drivers/intel/Makefile.inc +++ b/src/drivers/intel/Makefile.inc @@ -1 +1 @@ -subdirs-$(CONFIG_INTEL_DP) += gma +subdirs-y += gma diff --git a/src/drivers/intel/gma/Kconfig b/src/drivers/intel/gma/Kconfig index 073f708..e26c297 100644 --- a/src/drivers/intel/gma/Kconfig +++ b/src/drivers/intel/gma/Kconfig @@ -28,3 +28,7 @@ config INTEL_DDI default n help helper functions for intel DDI operations + +config INTEL_EDID + bool + default n diff --git a/src/drivers/intel/gma/Makefile.inc b/src/drivers/intel/gma/Makefile.inc index 0c3f45a..bea597e 100644 --- a/src/drivers/intel/gma/Makefile.inc +++ b/src/drivers/intel/gma/Makefile.inc @@ -19,4 +19,4 @@
ramstage-$(CONFIG_INTEL_DP) += intel_dp.c drm_dp_helper.c ramstage-$(CONFIG_INTEL_DDI) += intel_ddi.c - +ramstage-$(CONFIG_INTEL_EDID) += edid.c diff --git a/src/drivers/intel/gma/edid.c b/src/drivers/intel/gma/edid.c new file mode 100644 index 0000000..0a143e0 --- /dev/null +++ b/src/drivers/intel/gma/edid.c @@ -0,0 +1,80 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2014 Vladimir Serbinenko phcoder@gmail.com + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; version 2, or (at your option) + * any later verion of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, + * MA 02110-1301 USA + */ + +#include <arch/io.h> +#include <console/console.h> +#include <delay.h> + +#include "i915_reg.h" +#include "edid.h" + +static void wait_rdy(u32 mmio) +{ + unsigned try = 100; + + while (try--) { + if (read32(mmio + 8) & (1 << 11)) + return; + udelay(10); + } +} + +void intel_gmbus_read_edid(u32 mmio, u8 bus, u8 slave, u8 *edid, u32 edid_size) +{ + int i; + + slave &= 0x7f; + edid_size &= 0x1fc; + + wait_rdy(mmio); + /* 100 KHz, hold 0ns, */ + write32(mmio + 4 * 0, bus); + wait_rdy(mmio); + /* Ensure index bits are disabled. */ + write32(mmio + 4 * 5, 0); + write32(mmio + 4 * 1, 0x46000000 | (slave << 1)); + wait_rdy(mmio); + /* Ensure index bits are disabled. */ + write32(mmio + 4 * 5, 0); + write32(mmio + 4 * 1, 0x4a000001 | (slave << 1) + | (edid_size << 16)); + for (i = 0; i < edid_size / 4; i++) { + u32 reg32; + wait_rdy(mmio); + reg32 = read32(mmio + 4 * 3); + edid[4 * i] = reg32 & 0xff; + edid[4 * i + 1] = (reg32 >> 8) & 0xff; + edid[4 * i + 2] = (reg32 >> 16) & 0xff; + edid[4 * i + 3] = (reg32 >> 24) & 0xff; + } + wait_rdy(mmio); + write32(mmio + 4 * 1, 0x4a800000 | (slave << 1)); + wait_rdy(mmio); + write32(mmio + 4 * 0, 0x48000000); + write32(mmio + 4 * 2, 0x00008000); + + printk (BIOS_INFO, "EDID:\n"); + for (i = 0; i < 128; i++) { + printk (BIOS_INFO, "%02x ", edid[i]); + if ((i & 0xf) == 0xf) + printk (BIOS_INFO, "\n"); + } +} diff --git a/src/drivers/intel/gma/edid.h b/src/drivers/intel/gma/edid.h new file mode 100644 index 0000000..cb54b46 --- /dev/null +++ b/src/drivers/intel/gma/edid.h @@ -0,0 +1 @@ +void intel_gmbus_read_edid(u32 gmbus_mmio, u8 bus, u8 slave, u8 *edid, u32 edid_size);