[PATCH 1/2] KMS/Radeon: Add function for display scanout position query.
Alex Deucher
alexdeucher at gmail.com
Tue Oct 5 16:57:36 PDT 2010
From: Mario Kleiner <mario.kleiner at tuebingen.mpg.de>
radeon_get_crtc_scanoutpos() returns the current horizontal
and vertical scanout position of a crtc. It also reports if
the display scanout is currently inside the vblank area.
hpos reports current horizontal pixel scanout position.
vpos reports the current scanned out line as a value >= 0
in active scanout. If the scanout is inside vblank area, it
reports a negative value, the number of scanlines until
end of vblank aka start of active scanout, e.g., -3 ==
"At most 3 scanlines until end of vblank".
This code is derived from radeon_pm_in_vbl(), tested on
R500 and R600.
Signed-off-by: Mario Kleiner <mario.kleiner at tuebingen.mpg.de>
Signed-off-by: Alex Deucher <alexdeucher at gmail.com>
---
drivers/gpu/drm/radeon/radeon_display.c | 153 +++++++++++++++++++++++++++++++
drivers/gpu/drm/radeon/radeon_mode.h | 7 ++
2 files changed, 160 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index b418285..a7963df 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -964,3 +964,156 @@ bool radeon_crtc_scaling_mode_fixup(struct drm_crtc *crtc,
}
return true;
}
+
+/*
+ * Retrieve current video scanout position of crtc on a given gpu.
+ *
+ * \param rdev Device to query.
+ * \param crtc Crtc to query.
+ * \param *vpos Location where vertical scanout position should be stored.
+ * \param *hpos Location where horizontal scanout position should go.
+ *
+ * Returns vpos as a positive number while in active scanout area.
+ * Returns vpos as a negative number inside vblank, counting the number
+ * of scanlines to go until end of vblank, e.g., -1 means "one scanline
+ * until start of active scanout / end of vblank."
+ *
+ * \return Flags, or'ed together as follows:
+ *
+ * RADEON_SCANOUTPOS_VALID = Query successfull.
+ * RADEON_SCANOUTPOS_INVBL = Inside vblank.
+ * RADEON_SCANOUTPOS_ACCURATE = Returned position is accurate. A lack of
+ * this flag means that returned position may be offset by a constant but
+ * unknown small number of scanlines wrt. real scanout position.
+ *
+ */
+int radeon_get_crtc_scanoutpos(struct radeon_device *rdev, int crtc, int *vpos, int *hpos)
+{
+ u32 stat_crtc = 0, vbl = 0, position = 0;
+ int vbl_start, vbl_end, vtotal, ret = 0;
+ bool in_vbl = true;
+
+ if (ASIC_IS_DCE4(rdev)) {
+ if (crtc == 0) {
+ vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
+ EVERGREEN_CRTC0_REGISTER_OFFSET);
+ position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
+ EVERGREEN_CRTC0_REGISTER_OFFSET);
+ ret |= RADEON_SCANOUTPOS_VALID;
+ }
+ if (crtc == 1) {
+ vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
+ EVERGREEN_CRTC1_REGISTER_OFFSET);
+ position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
+ EVERGREEN_CRTC1_REGISTER_OFFSET);
+ ret |= RADEON_SCANOUTPOS_VALID;
+ }
+ if (crtc == 2) {
+ vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
+ EVERGREEN_CRTC2_REGISTER_OFFSET);
+ position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
+ EVERGREEN_CRTC2_REGISTER_OFFSET);
+ ret |= RADEON_SCANOUTPOS_VALID;
+ }
+ if (crtc == 3) {
+ vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
+ EVERGREEN_CRTC3_REGISTER_OFFSET);
+ position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
+ EVERGREEN_CRTC3_REGISTER_OFFSET);
+ ret |= RADEON_SCANOUTPOS_VALID;
+ }
+ if (crtc == 4) {
+ vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
+ EVERGREEN_CRTC4_REGISTER_OFFSET);
+ position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
+ EVERGREEN_CRTC4_REGISTER_OFFSET);
+ ret |= RADEON_SCANOUTPOS_VALID;
+ }
+ if (crtc == 5) {
+ vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
+ EVERGREEN_CRTC5_REGISTER_OFFSET);
+ position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
+ EVERGREEN_CRTC5_REGISTER_OFFSET);
+ ret |= RADEON_SCANOUTPOS_VALID;
+ }
+ } else if (ASIC_IS_AVIVO(rdev)) {
+ if (crtc == 0) {
+ vbl = RREG32(AVIVO_D1CRTC_V_BLANK_START_END);
+ position = RREG32(AVIVO_D1CRTC_STATUS_POSITION);
+ ret |= RADEON_SCANOUTPOS_VALID;
+ }
+ if (crtc == 1) {
+ vbl = RREG32(AVIVO_D2CRTC_V_BLANK_START_END);
+ position = RREG32(AVIVO_D2CRTC_STATUS_POSITION);
+ ret |= RADEON_SCANOUTPOS_VALID;
+ }
+ } else {
+ /* Pre-AVIVO: Different encoding of scanout pos and vblank interval. */
+ if (crtc == 0) {
+ /* Assume vbl_end == 0, get vbl_start from
+ * upper 16 bits.
+ */
+ vbl = (RREG32(RADEON_CRTC_V_TOTAL_DISP) &
+ RADEON_CRTC_V_DISP) >> RADEON_CRTC_V_DISP_SHIFT;
+ /* Only retrieve vpos from upper 16 bits, set hpos == 0. */
+ position = (RREG32(RADEON_CRTC_VLINE_CRNT_VLINE) >> 16) & RADEON_CRTC_V_TOTAL;
+ stat_crtc = RREG32(RADEON_CRTC_STATUS);
+ if (!(stat_crtc & 1))
+ in_vbl = false;
+
+ ret |= RADEON_SCANOUTPOS_VALID;
+ }
+ if (crtc == 1) {
+ vbl = (RREG32(RADEON_CRTC2_V_TOTAL_DISP) &
+ RADEON_CRTC_V_DISP) >> RADEON_CRTC_V_DISP_SHIFT;
+ position = (RREG32(RADEON_CRTC2_VLINE_CRNT_VLINE) >> 16) & RADEON_CRTC_V_TOTAL;
+ stat_crtc = RREG32(RADEON_CRTC2_STATUS);
+ if (!(stat_crtc & 1))
+ in_vbl = false;
+
+ ret |= RADEON_SCANOUTPOS_VALID;
+ }
+ }
+
+ /* Decode into vertical and horizontal scanout position. */
+ *vpos = position & 0x1fff;
+ *hpos = (position >> 16) & 0x1fff;
+
+ /* Valid vblank area boundaries from gpu retrieved? */
+ if (vbl > 0) {
+ /* Yes: Decode. */
+ ret |= RADEON_SCANOUTPOS_ACCURATE;
+ vbl_start = vbl & 0x1fff;
+ vbl_end = (vbl >> 16) & 0x1fff;
+ }
+ else {
+ /* No: Fake something reasonable which gives at least ok results. */
+ vbl_start = rdev->mode_info.crtcs[crtc]->base.mode.crtc_vdisplay;
+ vbl_end = 0;
+ }
+
+ /* Test scanout position against vblank region. */
+ if ((*vpos < vbl_start) && (*vpos >= vbl_end))
+ in_vbl = false;
+
+ /* Check if inside vblank area and apply corrective offsets:
+ * vpos will then be >=0 in video scanout area, but negative
+ * within vblank area, counting down the number of lines until
+ * start of scanout.
+ */
+
+ /* Inside "upper part" of vblank area? Apply corrective offset if so: */
+ if (in_vbl && (*vpos >= vbl_start)) {
+ vtotal = rdev->mode_info.crtcs[crtc]->base.mode.crtc_vtotal;
+ *vpos = *vpos - vtotal;
+ }
+
+ /* Correct for shifted end of vbl at vbl_end. */
+ *vpos = *vpos - vbl_end;
+
+ /* In vblank? */
+ if (in_vbl)
+ ret |= RADEON_SCANOUTPOS_INVBL;
+
+ return ret;
+}
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index a13a5c7..79a57a7 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -424,6 +424,11 @@ struct radeon_framebuffer {
struct drm_gem_object *obj;
};
+/* radeon_get_crtc_scanoutpos() return flags */
+#define RADEON_SCANOUTPOS_VALID (1 << 0)
+#define RADEON_SCANOUTPOS_INVBL (1 << 1)
+#define RADEON_SCANOUTPOS_ACCURATE (1 << 2)
+
extern enum radeon_tv_std
radeon_combios_get_tv_info(struct radeon_device *rdev);
extern enum radeon_tv_std
@@ -527,6 +532,8 @@ extern int radeon_crtc_cursor_set(struct drm_crtc *crtc,
extern int radeon_crtc_cursor_move(struct drm_crtc *crtc,
int x, int y);
+extern int radeon_get_crtc_scanoutpos(struct radeon_device *rdev, int crtc, int *vpos, int *hpos);
+
extern bool radeon_combios_check_hardcoded_edid(struct radeon_device *rdev);
extern struct edid *
radeon_combios_get_hardcoded_edid(struct radeon_device *rdev);
--
1.7.1.1
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