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Groups > linux.kernel > #1353669
| From | Kamal Mostafa <kamal@canonical.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.19.y-ckt 060/196] drm/dp/mst: Calculate MST PBN with 31.32 fixed point |
| Date | 2016-03-09 02:20 +0100 |
| Message-ID | <raAX7-Er-7@gated-at.bofh.it> (permalink) |
| References | <raAkq-ai-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
3.19.8-ckt16 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Harry Wentland <harry.wentland@amd.com>
commit a9ebb3e46c7ef6112c0da466ef0954673ad36832 upstream.
Our PBN value overflows the 20 bits integer part of the 20.12
fixed point. We need to use 31.32 fixed point to avoid this.
This happens with display clocks larger than 293122 (at 24 bpp),
which we see with the Sharp (and similar) 4k tiled displays.
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
drivers/gpu/drm/drm_dp_mst_topology.c | 67 ++++++++++++++++++++---------------
1 file changed, 39 insertions(+), 28 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index dd63756..60e7ac6 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2552,32 +2552,31 @@ EXPORT_SYMBOL(drm_dp_check_act_status);
*/
int drm_dp_calc_pbn_mode(int clock, int bpp)
{
- fixed20_12 pix_bw;
- fixed20_12 fbpp;
- fixed20_12 result;
- fixed20_12 margin, tmp;
- u32 res;
-
- pix_bw.full = dfixed_const(clock);
- fbpp.full = dfixed_const(bpp);
- tmp.full = dfixed_const(8);
- fbpp.full = dfixed_div(fbpp, tmp);
-
- result.full = dfixed_mul(pix_bw, fbpp);
- margin.full = dfixed_const(54);
- tmp.full = dfixed_const(64);
- margin.full = dfixed_div(margin, tmp);
- result.full = dfixed_div(result, margin);
-
- margin.full = dfixed_const(1006);
- tmp.full = dfixed_const(1000);
- margin.full = dfixed_div(margin, tmp);
- result.full = dfixed_mul(result, margin);
-
- result.full = dfixed_div(result, tmp);
- result.full = dfixed_ceil(result);
- res = dfixed_trunc(result);
- return res;
+ u64 kbps;
+ s64 peak_kbps;
+ u32 numerator;
+ u32 denominator;
+
+ kbps = clock * bpp;
+
+ /*
+ * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
+ * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
+ * common multiplier to render an integer PBN for all link rate/lane
+ * counts combinations
+ * calculate
+ * peak_kbps *= (1006/1000)
+ * peak_kbps *= (64/54)
+ * peak_kbps *= 8 convert to bytes
+ */
+
+ numerator = 64 * 1006;
+ denominator = 54 * 8 * 1000 * 1000;
+
+ kbps *= numerator;
+ peak_kbps = drm_fixp_from_fraction(kbps, denominator);
+
+ return drm_fixp2int_ceil(peak_kbps);
}
EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
@@ -2585,11 +2584,23 @@ static int test_calc_pbn_mode(void)
{
int ret;
ret = drm_dp_calc_pbn_mode(154000, 30);
- if (ret != 689)
+ if (ret != 689) {
+ DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
+ 154000, 30, 689, ret);
return -EINVAL;
+ }
ret = drm_dp_calc_pbn_mode(234000, 30);
- if (ret != 1047)
+ if (ret != 1047) {
+ DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
+ 234000, 30, 1047, ret);
return -EINVAL;
+ }
+ ret = drm_dp_calc_pbn_mode(297000, 24);
+ if (ret != 1063) {
+ DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
+ 297000, 24, 1063, ret);
+ return -EINVAL;
+ }
return 0;
}
--
2.7.0
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[PATCH 3.19.y-ckt 070/196] crypto: user - lock crypto_alg_list on alg dump Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 082/196] powerpc: Fix dedotify for binutils >= 2.26 Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 079/196] ALSA: dummy: Implement timer backend switching more safely Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 056/196] scsi_dh_rdac: always retry MODE SELECT on command lock violation Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 086/196] nfs: fix nfs_size_to_loff_t Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 073/196] serial: omap: Prevent DoS using unprivileged ioctl(TIOCSRS485) Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 083/196] ALSA: timer: Fix wrong instance passed to slave callbacks Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 067/196] ocfs2/dlm: clear refmap bit of recovery lock while doing local recovery cleanup Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 045/196] drivers/scsi/sg.c: mark VMA as VM_IO to prevent migration Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 058/196] drm: fix missing reference counting decrease Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 047/196] Revert "xhci: don't finish a TD if we get a short-transfer event mid TD" Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 060/196] drm/dp/mst: Calculate MST PBN with 31.32 fixed point Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 033/196] ALSA: timer: Fix link corruption due to double start or stop Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 027/196] intel_scu_ipcutil: underflow in scu_reg_access() Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 039/196] ASoC: dpcm: fix the BE state on hw_free Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 028/196] ALSA: seq: Fix race at closing in virmidi driver Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 037/196] drm: add helper to check for wc memory support Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 015/196] libata: disable forced PORTS_IMPL for >= AHCI 1.3 Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 046/196] radix-tree: fix race in gang lookup Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 051/196] [media] tda1004x: only update the frontend properties if locked Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 049/196] xhci: Fix list corruption in urb dequeue at host removal Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 057/196] SCSI: Add Marvell Console to VPD blacklist Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 029/196] ALSA: rawmidi: Remove kernel WARNING for NULL user-space buffer check Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 040/196] module: wrapper for symbol name. Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 041/196] ALSA: hda - Add fixup for Mac Mini 7,1 model Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 059/196] drm: Add drm_fixp_from_fraction and drm_fixp2int_ceil Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 034/196] libata: fix sff host state machine locking while polling Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 025/196] iio: inkern: fix a NULL dereference on error Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 008/196] x86/entry/compat: Add missing CLAC to entry_INT80_32 Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 043/196] ALSA: rawmidi: Fix race at copying & updating the position Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 042/196] ALSA: rawmidi: Make snd_rawmidi_transmit() race-free Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 031/196] ALSA: seq: Fix yet another races among ALSA timer accesses Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 030/196] ALSA: pcm: Fix potential deadlock in OSS emulation Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 044/196] ALSA: seq: Fix lockdep warnings due to double mutex locks Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 035/196] MIPS: Fix buffer overflow in syscall_get_arguments() Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 036/196] cputime: Prevent 32bit overflow in time[val|spec]_to_cputime() Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 024/196] crypto: algif_hash - wait for crypto_ahash_init() to complete Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 014/196] PCI/AER: Flush workqueue on device remove to avoid use-after-free Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 023/196] target: Fix WRITE_SAME/DISCARD conversion to linux 512b sectors Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 013/196] cgroup: make sure a parent css isn't offlined before its children Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 026/196] iio: pressure: mpl115: fix temperature offset sign Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 038/196] drm/radeon: mask out WC from BO on unsupported arches Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 032/196] ALSA: timer: Code cleanup Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 005/196] EVM: Use crypto_memneq() for digest comparisons Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:30 +0100
[PATCH 3.19.y-ckt 007/196] drm/vmwgfx: Fix an fb unlocking bug Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:30 +0100
[PATCH 3.19.y-ckt 004/196] iw_cxgb3: Fix incorrectly returning error on success Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:30 +0100
[PATCH 3.19.y-ckt 010/196] iio: dac: mcp4725: set iio name property in sysfs Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:30 +0100
[PATCH 3.19.y-ckt 006/196] ALSA: usb-audio: avoid freeing umidi object twice Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:30 +0100
[PATCH 3.19.y-ckt 011/196] iommu/vt-d: Fix 64-bit accesses to 32-bit DMAR_GSTS_REG Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:30 +0100
csiph-web