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nb/intel/gm45/gma: Probe PCI resource once and first 

The PCI resource should only be probed as part of the device
.init process. We can simply do that first and know that we
can use the global `gtt_res` from then on.

This simplifies the signature of gm45_get_lvds_edid_str(), and
makes changes to the API user (lenovo/x200) necessary.

Change-Id: I6c96f715abfa56dcb1cd89fde0fbaef3f1cb63ae
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75376
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
This commit is contained in:
Nico Huber 2023-05-18 13:51:18 +02:00 committed by Felix Singer
parent 9405541b1a
commit e5888da8de
3 changed files with 13 additions and 11 deletions
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3
src/mainboard/lenovo/x200/blc.c
View File

@ -38,8 +38,7 @@ int get_blc_values(const struct blc_pwm_t **entries)
const char *mainboard_vbt_filename(void)
{
struct device *gma = pcidev_path_on_root(PCI_DEVFN(0x2, 0));
u16 pwm_freq = gma ? get_blc_pwm_freq_value(gm45_get_lvds_edid_str(gma)) : 0;
u16 pwm_freq = get_blc_pwm_freq_value(gm45_get_lvds_edid_str());
if (pwm_freq == 0) {
printk(BIOS_DEBUG,

2
src/northbridge/intel/gm45/gm45.h
View File

@ -449,7 +449,7 @@ u16 get_blc_pwm_freq_value(const char *edid_ascii_string);
#include <device/device.h>
#include <edid.h>
const char *gm45_get_lvds_edid_str(struct device *dev);
const char *gm45_get_lvds_edid_str(void);
struct acpi_rsdp;
unsigned long northbridge_write_acpi_tables(const struct device *device, unsigned long start,

19
src/northbridge/intel/gm45/gma.c
View File

@ -143,7 +143,7 @@ static void gma_pm_init_post_vbios(struct device *const dev,
reg8));
}
const char *gm45_get_lvds_edid_str(struct device *dev)
const char *gm45_get_lvds_edid_str(void)
{
u8 *mmio;
u8 edid_data_lvds[128];
@ -152,10 +152,10 @@ const char *gm45_get_lvds_edid_str(struct device *dev)
if (edid_str[0])
return edid_str;
if (!gtt_res)
gtt_res = probe_resource(dev, PCI_BASE_ADDRESS_0);
if (!gtt_res)
if (!gtt_res) {
printk(BIOS_ERR, "Never call %s() outside dev.init() context.\n", __func__);
return NULL;
}
mmio = res2mmio(gtt_res, 0, 0);
printk(BIOS_DEBUG, "LVDS EDID\n");
@ -176,15 +176,18 @@ static void gma_func0_init(struct device *dev)
const struct northbridge_intel_gm45_config *const conf = dev->chip_info;
const char *edid_str;
/* Probe MMIO resource first. It's needed even for
intel_gma_init_igd_opregion() which may call back. */
gtt_res = probe_resource(dev, PCI_BASE_ADDRESS_0);
if (!gtt_res)
return;
intel_gma_init_igd_opregion();
edid_str = gm45_get_lvds_edid_str(dev);
edid_str = gm45_get_lvds_edid_str();
if (!edid_str)
printk(BIOS_ERR, "Failed to obtain LVDS EDID string!\n");
/* gtt_res should have been inited in gm45_get_lvds_edid_str() */
if (!gtt_res)
return;
mmio = res2mmio(gtt_res, 0, 0);
/*