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authorVille Syrjälä <ville.syrjala@linux.intel.com>2024-09-30 20:04:08 +0300
committerVille Syrjälä <ville.syrjala@linux.intel.com>2024-10-04 00:33:10 +0300
commitde968532fd562af00cd630b5bb7f42e36dbbe755 (patch)
tree3f35a539a06f625e1c955c28b1ef1bf7f1e2d43f
parent63b41d207dc12ee2632fcad6229bfca2c54da5d9 (diff)
downloadlwn-de968532fd562af00cd630b5bb7f42e36dbbe755.tar.gz
lwn-de968532fd562af00cd630b5bb7f42e36dbbe755.zip
drm/i915/dsb: Introduce intel_dsb_wait_usec()
Add a function to emit the DSB "wait usecs" instruction. This is just a usleep() for the DSB. As a lower bound it seems pretty accurate, but the upper bound seemed oddly relaxed (ie. sometimes I've seen waits that are quite a bit longer than specified, not sure why). Reviewed-by: Animesh Manna <animesh.manna@intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240930170415.23841-7-ville.syrjala@linux.intel.com
-rw-r--r--drivers/gpu/drm/i915/display/intel_dsb.c6
-rw-r--r--drivers/gpu/drm/i915/display/intel_dsb.h1
2 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c
index 9ed7b03c1e33..3aaed94c7e65 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.c
+++ b/drivers/gpu/drm/i915/display/intel_dsb.c
@@ -393,6 +393,12 @@ void intel_dsb_interrupt(struct intel_dsb *dsb)
DSB_OPCODE_INTERRUPT << DSB_OPCODE_SHIFT);
}
+void intel_dsb_wait_usec(struct intel_dsb *dsb, int count)
+{
+ intel_dsb_emit(dsb, count,
+ DSB_OPCODE_WAIT_USEC << DSB_OPCODE_SHIFT);
+}
+
static void intel_dsb_emit_wait_dsl(struct intel_dsb *dsb,
u32 opcode, int lower, int upper)
{
diff --git a/drivers/gpu/drm/i915/display/intel_dsb.h b/drivers/gpu/drm/i915/display/intel_dsb.h
index cce5cb1c6071..882088f55580 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.h
+++ b/drivers/gpu/drm/i915/display/intel_dsb.h
@@ -40,6 +40,7 @@ void intel_dsb_noop(struct intel_dsb *dsb, int count);
void intel_dsb_nonpost_start(struct intel_dsb *dsb);
void intel_dsb_nonpost_end(struct intel_dsb *dsb);
void intel_dsb_interrupt(struct intel_dsb *dsb);
+void intel_dsb_wait_usec(struct intel_dsb *dsb, int count);
void intel_dsb_wait_scanline_in(struct intel_atomic_state *state,
struct intel_dsb *dsb,
int lower, int upper);