Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1582079
| Path | csiph.com!news.redatomik.org!aioe.org!bofh.it!news.nic.it!robomod |
|---|---|
| From | Ben Hutchings <ben@decadent.org.uk> |
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.16 127/306] drm/radeon: change vblank_time's calculation method to reduce computational error. |
| Date | Thu, 16 Feb 2017 01:10:02 +0100 |
| Message-ID | <tbhO2-6VI-15@gated-at.bofh.it> (permalink) |
| References | <tbgRY-6hT-29@gated-at.bofh.it> |
| X-Original-To | linux-kernel@vger.kernel.org, stable@vger.kernel.org |
| Content-Type | text/plain; charset="UTF-8" |
| Content-Disposition | inline |
| Content-Transfer-Encoding | 8bit |
| MIME-Version | 1.0 |
| X-Mailer | LinuxStableQueue (scripts by bwh) |
| X-Sa-Exim-Connect-IP | 2a02:8011:400e:2:6f00:88c8:c921:d332 |
| X-Sa-Exim-Mail-From | ben@decadent.org.uk |
| X-Sa-Exim-Scanned | No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false |
| Sender | robomod@news.nic.it |
| List-ID | <linux-kernel.vger.kernel.org> |
| X-Mailing-List | linux-kernel@vger.kernel.org |
| Approved | robomod@news.nic.it |
| Lines | 46 |
| Organization | linux.* mail to news gateway |
| X-Original-Cc | akpm@linux-foundation.org, "Alex Deucher" <alexander.deucher@amd.com> |
| X-Original-Date | Wed, 15 Feb 2017 22:41:40 +0000 |
| X-Original-Message-ID | <lsq.1487198500.98447276@decadent.org.uk> |
| X-Original-References | <lsq.1487198498.99718322@decadent.org.uk> |
| X-Original-Sender | linux-kernel-owner@vger.kernel.org |
| Xref | csiph.com linux.kernel:1582079 |
Show key headers only | View raw
3.16.40-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Alex Deucher <alexander.deucher@amd.com>
commit 02cfb5fccb0f9f968f0e208d89d9769aa16267bc upstream.
Ported from Rex's amdgpu change.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/gpu/drm/radeon/r600_dpm.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
--- a/drivers/gpu/drm/radeon/r600_dpm.c
+++ b/drivers/gpu/drm/radeon/r600_dpm.c
@@ -155,19 +155,20 @@ u32 r600_dpm_get_vblank_time(struct rade
struct drm_device *dev = rdev->ddev;
struct drm_crtc *crtc;
struct radeon_crtc *radeon_crtc;
- u32 line_time_us, vblank_lines;
+ u32 vblank_in_pixels;
u32 vblank_time_us = 0xffffffff; /* if the displays are off, vblank time is max */
if (rdev->num_crtc && rdev->mode_info.mode_config_initialized) {
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
radeon_crtc = to_radeon_crtc(crtc);
if (crtc->enabled && radeon_crtc->enabled && radeon_crtc->hw_mode.clock) {
- line_time_us = (radeon_crtc->hw_mode.crtc_htotal * 1000) /
- radeon_crtc->hw_mode.clock;
- vblank_lines = radeon_crtc->hw_mode.crtc_vblank_end -
- radeon_crtc->hw_mode.crtc_vdisplay +
- (radeon_crtc->v_border * 2);
- vblank_time_us = vblank_lines * line_time_us;
+ vblank_in_pixels =
+ radeon_crtc->hw_mode.crtc_htotal *
+ (radeon_crtc->hw_mode.crtc_vblank_end -
+ radeon_crtc->hw_mode.crtc_vdisplay +
+ (radeon_crtc->v_border * 2));
+
+ vblank_time_us = vblank_in_pixels * 1000 / radeon_crtc->hw_mode.clock;
break;
}
}
Back to linux.kernel | Previous | Next | Find similar | Unroll thread
[PATCH 3.16 127/306] drm/radeon: change vblank_time's calculation method to reduce computational error. Ben Hutchings <ben@decadent.org.uk> - 2017-02-16 01:10 +0100
csiph-web