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| author | Martin Peres <martin.peres@ensi-bourges.fr> | 2011-07-30 23:08:45 +0200 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2011-09-20 16:11:28 +1000 |
| commit | fbba036a56fe0e5c5e8c91daf3fa211f88d94a03 (patch) | |
| tree | ac4ea6a7de5216d836ad85127443784f9f5c4140 /drivers/gpu/drm/nouveau/nv50_grctx.c | |
| parent | c16a3a358b6460696b2dc275cbbab1adbbbd1f67 (diff) | |
| download | blackbird-op-linux-fbba036a56fe0e5c5e8c91daf3fa211f88d94a03.tar.gz blackbird-op-linux-fbba036a56fe0e5c5e8c91daf3fa211f88d94a03.zip | |
drm/nv50/gr: enable ctxprog xfer only when we need it to save power
This patch adds instructions to ctxprog and by doing, impacts context
switching performance. My testcase showed a 1% performance cost using
glxgears that is a context-switch bound application.
Please test and report bugs/performance/power/other.
Many thanks to Maxim Levitsky for his dedicated work on lowering power
consumption with nouveau.
More patches are coming thanks to his work:
https://bugs.freedesktop.org/show_bug.cgi?id=37922
Signed-off-by: Martin Peres <martin.peres@ensi-bourges.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/nouveau/nv50_grctx.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nv50_grctx.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nv50_grctx.c b/drivers/gpu/drm/nouveau/nv50_grctx.c index e04fb4483c5e..d05c2c3b2444 100644 --- a/drivers/gpu/drm/nouveau/nv50_grctx.c +++ b/drivers/gpu/drm/nouveau/nv50_grctx.c @@ -40,6 +40,9 @@ #define CP_FLAG_UNK0B ((0 * 32) + 0xb) #define CP_FLAG_UNK0B_CLEAR 0 #define CP_FLAG_UNK0B_SET 1 +#define CP_FLAG_XFER_SWITCH ((0 * 32) + 0xe) +#define CP_FLAG_XFER_SWITCH_DISABLE 0 +#define CP_FLAG_XFER_SWITCH_ENABLE 1 #define CP_FLAG_STATE ((0 * 32) + 0x1c) #define CP_FLAG_STATE_STOPPED 0 #define CP_FLAG_STATE_RUNNING 1 @@ -199,6 +202,7 @@ nv50_grctx_init(struct nouveau_grctx *ctx) } cp_set (ctx, STATE, RUNNING); + cp_set (ctx, XFER_SWITCH, ENABLE); /* decide whether we're loading/unloading the context */ cp_bra (ctx, AUTO_SAVE, PENDING, cp_setup_save); cp_bra (ctx, USER_SAVE, PENDING, cp_setup_save); @@ -265,6 +269,7 @@ nv50_grctx_init(struct nouveau_grctx *ctx) cp_name(ctx, cp_exit); cp_set (ctx, USER_SAVE, NOT_PENDING); cp_set (ctx, USER_LOAD, NOT_PENDING); + cp_set (ctx, XFER_SWITCH, DISABLE); cp_set (ctx, STATE, STOPPED); cp_out (ctx, CP_END); ctx->ctxvals_pos += 0x400; /* padding... no idea why you need it */ |
