drm/amd/display: Don't reset clock source at unref

Powering down the clock source during unref is unsafe as we might want
to unref during atomic_check

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index ce721b7..57c3dcd 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -261,31 +261,34 @@ bool resource_construct(
 }
 
 
-void resource_unreference_clock_source(
+bool resource_unreference_clock_source(
                struct resource_context *res_ctx,
                const struct resource_pool *pool,
-               struct clock_source **clock_source)
+               struct clock_source *clock_source)
 {
        int i;
+       bool need_reset = false;
+
        for (i = 0; i < pool->clk_src_count; i++) {
-               if (pool->clock_sources[i] != *clock_source)
+               if (pool->clock_sources[i] != clock_source)
                        continue;
 
                res_ctx->clock_source_ref_count[i]--;
 
                if (res_ctx->clock_source_ref_count[i] == 0)
-                       (*clock_source)->funcs->cs_power_down(*clock_source);
+                       need_reset = true;
 
                break;
        }
 
-       if (pool->dp_clock_source == *clock_source) {
+       if (pool->dp_clock_source == clock_source) {
                res_ctx->dp_clock_source_ref_count--;
 
                if (res_ctx->dp_clock_source_ref_count == 0)
-                       (*clock_source)->funcs->cs_power_down(*clock_source);
+                       need_reset = true;
        }
-       *clock_source = NULL;
+
+       return need_reset;
 }
 
 void resource_reference_clock_source(
@@ -1756,10 +1759,14 @@ bool dc_validate_global_state(
                        if (dc_is_dp_signal(pipe_ctx->stream->signal) &&
                                !find_pll_sharable_stream(stream, new_ctx)) {
 
-                               resource_unreference_clock_source(
+                               if (resource_unreference_clock_source(
                                                &new_ctx->res_ctx,
                                                dc->res_pool,
-                                               &pipe_ctx->clock_source);
+                                               pipe_ctx->clock_source)) {
+                                       pipe_ctx->clock_source->funcs->cs_power_down(pipe_ctx->clock_source);
+                                       pipe_ctx->clock_source = NULL;
+                               }
+
                                pipe_ctx->clock_source = dc->res_pool->dp_clock_source;
                                resource_reference_clock_source(
                                                &new_ctx->res_ctx,

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index b36220b..75c636c 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -1362,9 +1362,12 @@ static void switch_dp_clock_sources(
 
                        if (clk_src &&
                                clk_src != pipe_ctx->clock_source) {
-                               resource_unreference_clock_source(
-                                       res_ctx, dc->res_pool,
-                                       &pipe_ctx->clock_source);
+                               if (resource_unreference_clock_source(res_ctx,
+                                   dc->res_pool, pipe_ctx->clock_source)) {
+                                       pipe_ctx->clock_source->funcs->cs_power_down(pipe_ctx->clock_source);
+                                       pipe_ctx->clock_source = NULL;
+                               }
+
                                pipe_ctx->clock_source = clk_src;
                                resource_reference_clock_source(
                                                res_ctx, dc->res_pool, clk_src);
@@ -1680,9 +1683,12 @@ static void dce110_reset_hw_ctx_wrap(
                        pipe_ctx_old->stream_res.tg->funcs->disable_crtc(pipe_ctx_old->stream_res.tg);
                        pipe_ctx_old->plane_res.mi->funcs->free_mem_input(
                                        pipe_ctx_old->plane_res.mi, dc->current_state->stream_count);
-                       resource_unreference_clock_source(
+                       if (resource_unreference_clock_source(
                                        &dc->current_state->res_ctx, dc->res_pool,
-                                       &pipe_ctx_old->clock_source);
+                                       pipe_ctx_old->clock_source)) {
+                               pipe_ctx_old->clock_source->funcs->cs_power_down(pipe_ctx_old->clock_source);
+                               pipe_ctx_old->clock_source = NULL;
+                       }
 
                        dc->hwss.power_down_front_end(dc, pipe_ctx_old->pipe_idx);
 

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index 6b76fc4..7460560 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -1045,9 +1045,12 @@ static void reset_back_end_for_pipe(
        }
 
        if (!IS_FPGA_MAXIMUS_DC(dc->ctx->dce_environment))
-               resource_unreference_clock_source(
-                       &context->res_ctx, dc->res_pool,
-                       &pipe_ctx->clock_source);
+               if (resource_unreference_clock_source(&context->res_ctx,
+                   dc->res_pool, pipe_ctx->clock_source)) {
+                       pipe_ctx->clock_source->funcs->cs_power_down(pipe_ctx->clock_source);
+                       pipe_ctx->clock_source = NULL;
+               }
+
 
        for (i = 0; i < dc->res_pool->pipe_count; i++)
                if (&dc->current_state->res_ctx.pipe_ctx[i] == pipe_ctx)

diff --git a/drivers/gpu/drm/amd/display/dc/inc/resource.h b/drivers/gpu/drm/amd/display/dc/inc/resource.h
index 41437da..cf1797c 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/inc/resource.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/resource.h
@@ -92,10 +92,10 @@ enum dc_status resource_build_scaling_params_for_context(
 
 void resource_build_info_frame(struct pipe_ctx *pipe_ctx);
 
-void resource_unreference_clock_source(
+bool resource_unreference_clock_source(
                struct resource_context *res_ctx,
                const struct resource_pool *pool,
-               struct clock_source **clock_source);
+               struct clock_source *clock_source);
 
 void resource_reference_clock_source(
                struct resource_context *res_ctx,