From d1ff6409b1cd2cd2a65df415648fa38b9fdf4cd8 Mon Sep 17 00:00:00 2001 From: Adam Jackson Date: Mon, 29 Mar 2010 21:43:26 +0000 Subject: [PATCH] drm/edid: Add test for monitor reduced blanking support. 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 Signed-off-by: Dave Airlie --- drivers/gpu/drm/drm_edid.c | 47 ++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 43 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 2e1298c..a1b6b43 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, @@ -670,6 +674,45 @@ 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; + 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. @@ -952,10 +995,6 @@ static struct drm_display_mode edid_est_modes[] = { DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1152x864@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 -- 2.7.4