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drm/i915: Improve CRTDDC mapping by using VBT info

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Use VBT information to determine which DDC bus to use for CRTDCC.
Fall back to GPIOA if VBT info is not available.

Signed-off-by: David Müller <d.mueller@elsoft.ch>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Tested on: 855 (David), and 945GM, 965GM, GM45, and G45 (anholt)
This commit is contained in:
David Müller (ELSOFT AG) 2009-08-29 08:54:45 +02:00 committed by Eric Anholt
parent a09ba7faf7
commit db54501900
3 changed files with 55 additions and 4 deletions
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1
drivers/gpu/drm/i915/i915_drv.h
View file

@ -222,6 +222,7 @@ typedef struct drm_i915_private {
unsigned int edp_support:1;
int lvds_ssc_freq;
int crt_ddc_bus; /* -1 = unknown, else GPIO to use for CRT DDC */
struct drm_i915_fence_reg fence_regs[16]; /* assume 965 */
int fence_reg_start; /* 4 if userland hasn't ioctl'd us yet */
int num_fence_regs; /* 8 on pre-965, 16 otherwise */

51
drivers/gpu/drm/i915/intel_bios.c
View file

@ -59,6 +59,16 @@ find_section(struct bdb_header *bdb, int section_id)
return NULL;
}
static u16
get_blocksize(void *p)
{
u16 *block_ptr, block_size;
block_ptr = (u16 *)((char *)p - 2);
block_size = *block_ptr;
return block_size;
}
static void
fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
struct lvds_dvo_timing *dvo_timing)
@ -214,6 +224,41 @@ parse_general_features(struct drm_i915_private *dev_priv,
}
}
static void
parse_general_definitions(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
{
struct bdb_general_definitions *general;
const int crt_bus_map_table[] = {
GPIOB,
GPIOA,
GPIOC,
GPIOD,
GPIOE,
GPIOF,
};
/* Set sensible defaults in case we can't find the general block
or it is the wrong chipset */
dev_priv->crt_ddc_bus = -1;
general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
if (general) {
u16 block_size = get_blocksize(general);
if (block_size >= sizeof(*general)) {
int bus_pin = general->crt_ddc_gmbus_pin;
DRM_DEBUG("crt_ddc_bus_pin: %d\n", bus_pin);
if ((bus_pin >= 1) && (bus_pin <= 6)) {
dev_priv->crt_ddc_bus =
crt_bus_map_table[bus_pin-1];
}
} else {
DRM_DEBUG("BDB_GD too small (%d). Invalid.\n",
block_size);
}
}
}
static void
parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
@ -222,7 +267,7 @@ parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
struct bdb_general_definitions *p_defs;
struct child_device_config *p_child;
int i, child_device_num, count;
u16 block_size, *block_ptr;
u16 block_size;
p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
if (!p_defs) {
@ -240,8 +285,7 @@ parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
return;
}
/* get the block size of general definitions */
block_ptr = (u16 *)((char *)p_defs - 2);
block_size = *block_ptr;
block_size = get_blocksize(p_defs);
/* get the number of child device */
child_device_num = (block_size - sizeof(*p_defs)) /
sizeof(*p_child);
@ -362,6 +406,7 @@ intel_init_bios(struct drm_device *dev)
/* Grab useful general definitions */
parse_general_features(dev_priv, bdb);
parse_general_definitions(dev_priv, bdb);
parse_lfp_panel_data(dev_priv, bdb);
parse_sdvo_panel_data(dev_priv, bdb);
parse_sdvo_device_mapping(dev_priv, bdb);

7
drivers/gpu/drm/i915/intel_crt.c
View file

@ -508,6 +508,7 @@ void intel_crt_init(struct drm_device *dev)
{
struct drm_connector *connector;
struct intel_output *intel_output;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 i2c_reg;
intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
@ -527,8 +528,12 @@ void intel_crt_init(struct drm_device *dev)
/* Set up the DDC bus. */
if (IS_IGDNG(dev))
i2c_reg = PCH_GPIOA;
else
else {
i2c_reg = GPIOA;
/* Use VBT information for CRT DDC if available */
if (dev_priv->crt_ddc_bus != -1)
i2c_reg = dev_priv->crt_ddc_bus;
}
intel_output->ddc_bus = intel_i2c_create(dev, i2c_reg, "CRTDDC_A");
if (!intel_output->ddc_bus) {
dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "