Adam Jackson wrote:
> The generic block walk callback looks like overkill, but we'll need it
> for other detailed block walks in the future.
>
> Signed-off-by: Adam Jackson <[email protected]>
> ---
> drivers/gpu/drm/drm_edid.c | 47 ++++++++++++++++++++++++++++++++++++++++---
> 1 files changed, 43 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index fb7c2fc..ead57ab 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -33,6 +33,10 @@
> #include "drmP.h"
> #include "drm_edid.h"
>
> +#define EDID_EST_TIMINGS 16
> +#define EDID_STD_TIMINGS 8
> +#define EDID_DETAILED_TIMINGS 4
> +
> /*
> * EDID blocks out in the wild have a variety of bugs, try to collect
> * them here (note that userspace may work around broken monitors first,
> @@ -673,6 +677,45 @@ static struct drm_display_mode *drm_find_dmt(struct
> drm_device *dev,
> return mode;
> }
>
> +typedef void detailed_cb(struct detailed_timing *timing, void *closure);
> +
> +static void
> +drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
> +{
> + int i;
> + struct edid *edid = (struct edid *)raw_edid;
> +
> + if (edid == NULL)
> + return;
> +
> + for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
> + cb(&(edid->detailed_timings[i]), closure);
> +
> + /* XXX extension block walk */
> +}
> +
> +static void
> +is_rb(struct detailed_timing *t, void *data)
> +{
> + u8 *r = (u8 *)t;
> + if (r[3] == EDID_DETAIL_MONITOR_RANGE)
> + if (r[15] & 0x10)
> + *(bool *)data = true;
> +}
> +
> +/* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
> +static bool
> +drm_monitor_supports_rb(struct edid *edid)
> +{
> + if (edid->revision >= 4) {
> + bool ret;
You need to initialize "ret" here ("bool ret = false;").
> + drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
> + return ret;
> + }
> +
> + return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);
> +}
> +
> /*
> * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
> * monitors fill with ascii space (0x20) instead.
> @@ -964,10 +1007,6 @@ static struct drm_display_mode edid_est_modes[] = {
> DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /*
> 1152x...@75hz */
> };
>
> -#define EDID_EST_TIMINGS 16
> -#define EDID_STD_TIMINGS 8
> -#define EDID_DETAILED_TIMINGS 4
> -
> /**
> * add_established_modes - get est. modes from EDID and add them
> * @edid: EDID block to scan
MM
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