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drm/i915: fix gpio register detection logic for BIOS without VBT 

if no VBT is present, crt_ddc_bus will be left at 0, and cause us
to use that for the GPIO register offset. That's never a valid register
offset, so let the "undefined" value be 0 instead of -1.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
[anholt: clarified the commit message a bit]
This commit is contained in:
Shaohua Li 2009-11-18 15:15:02 +08:00 committed by Eric Anholt
parent d271817bae
commit 29874f44fb
3 changed files with 2 additions and 6 deletions
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2
drivers/gpu/drm/i915/i915_drv.h
View File

@ -266,7 +266,7 @@ typedef struct drm_i915_private {
struct notifier_block lid_notifier;
int crt_ddc_bus; /* -1 = unknown, else GPIO to use for CRT DDC */
int crt_ddc_bus; /* 0 = 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 */

4
drivers/gpu/drm/i915/intel_bios.c
View File

@ -283,10 +283,6 @@ parse_general_definitions(struct drm_i915_private *dev_priv,
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);

2
drivers/gpu/drm/i915/intel_crt.c
View File

@ -526,7 +526,7 @@ void intel_crt_init(struct drm_device *dev)
else {
i2c_reg = GPIOA;
/* Use VBT information for CRT DDC if available */
if (dev_priv->crt_ddc_bus != -1)
if (dev_priv->crt_ddc_bus != 0)
i2c_reg = dev_priv->crt_ddc_bus;
}
intel_output->ddc_bus = intel_i2c_create(dev, i2c_reg, "CRTDDC_A");