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https://github.com/edk2-porting/linux-next.git
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drm/edid: Add detailed block walk for CEA extensions
Signed-off-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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@ -684,6 +684,33 @@ EXPORT_SYMBOL(drm_mode_find_dmt);
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typedef void detailed_cb(struct detailed_timing *timing, void *closure);
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static void
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cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
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{
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int i, n = 0;
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u8 rev = ext[0x01], d = ext[0x02];
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u8 *det_base = ext + d;
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switch (rev) {
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case 0:
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/* can't happen */
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return;
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case 1:
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/* have to infer how many blocks we have, check pixel clock */
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for (i = 0; i < 6; i++)
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if (det_base[18*i] || det_base[18*i+1])
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n++;
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break;
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default:
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/* explicit count */
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n = min(ext[0x03] & 0x0f, 6);
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break;
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}
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for (i = 0; i < n; i++)
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cb((struct detailed_timing *)(det_base + 18 * i), closure);
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}
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static void
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drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
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{
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@ -696,7 +723,16 @@ drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
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for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
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cb(&(edid->detailed_timings[i]), closure);
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/* XXX extension block walk */
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for (i = 1; i <= raw_edid[0x7e]; i++) {
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u8 *ext = raw_edid + (i * EDID_LENGTH);
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switch (*ext) {
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case CEA_EXT:
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cea_for_each_detailed_block(ext, cb, closure);
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break;
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default:
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break;
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}
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}
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}
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static void
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@ -28,6 +28,12 @@
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#define EDID_LENGTH 128
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#define DDC_ADDR 0x50
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#define CEA_EXT 0x02
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#define VTB_EXT 0x10
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#define DI_EXT 0x40
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#define LS_EXT 0x50
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#define MI_EXT 0x60
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struct est_timings {
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u8 t1;
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u8 t2;
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