1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
From aa41027a9db37ff9795b5dd6b6ec71cc10eee9d2 Mon Sep 17 00:00:00 2001
From: Ken Chalmers <ken.chalmers@amd.com>
Date: Fri, 10 Aug 2018 15:51:59 -0400
Subject: [PATCH 0230/2940] drm/amd/display: eliminate long wait between
register polls on Maximus
[Why]
Now that we "scale" time delays correctly on Maximus (as of diags svn
r170115), the forced "35 ms" wait time now becomes 35 ms * 500 = 17.5
seconds, which is far too long. Even having to repeat polling a
register once causes excessive delays on Maximus.
[How]
Just use the regular wait time passed to the generic_reg_wait()
function. This is sufficient for Maximus now, and it also means that
there's one less "Maximus-only" code path in DAL.
Also disable the "REG_WAIT taking a while:" message on Maximus, since
things do take a while longer there and 1-2ms delays are not uncommon
(and nothing to worry about).
Signed-off-by: Ken Chalmers <ken.chalmers@amd.com>
Reviewed-by: Eric Bernstein <Eric.Bernstein@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/display/dc/dc_helper.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dc_helper.c b/drivers/gpu/drm/amd/display/dc/dc_helper.c
index e68077e65565..fcfd50b5dba0 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_helper.c
+++ b/drivers/gpu/drm/amd/display/dc/dc_helper.c
@@ -219,12 +219,6 @@ uint32_t generic_reg_wait(const struct dc_context *ctx,
/* something is terribly wrong if time out is > 200ms. (5Hz) */
ASSERT(delay_between_poll_us * time_out_num_tries <= 200000);
- if (IS_FPGA_MAXIMUS_DC(ctx->dce_environment)) {
- /* 35 seconds */
- delay_between_poll_us = 35000;
- time_out_num_tries = 1000;
- }
-
for (i = 0; i <= time_out_num_tries; i++) {
if (i) {
if (delay_between_poll_us >= 1000)
@@ -238,7 +232,8 @@ uint32_t generic_reg_wait(const struct dc_context *ctx,
field_value = get_reg_field_value_ex(reg_val, mask, shift);
if (field_value == condition_value) {
- if (i * delay_between_poll_us > 1000)
+ if (i * delay_between_poll_us > 1000 &&
+ !IS_FPGA_MAXIMUS_DC(ctx->dce_environment))
dm_output_to_console("REG_WAIT taking a while: %dms in %s line:%d\n",
delay_between_poll_us * i / 1000,
func_name, line);
--
2.17.1
|
