From ad8960a6cb06c446d0a391ce095f6f28edf36aff Mon Sep 17 00:00:00 2001 From: Mikita Lipski Date: Thu, 2 Aug 2018 09:45:09 -0400 Subject: [PATCH] drm/amd/display: Check if clock source in use before disabling [why] We are disabling clock source while other pipes are still using it, because we don't verify the number of pipes that share it. [how] - Adding a function in resources to return the number of pipes sharing the clock source. - Checking that no one is sharing the clock source before disabling Signed-off-by: Mikita Lipski Reviewed-by: Harry Wentland Acked-by: Leo Li Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org --- drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 46 +++++++++++++++------- .../amd/display/dc/dce110/dce110_hw_sequencer.c | 4 +- drivers/gpu/drm/amd/display/dc/inc/resource.h | 5 +++ 3 files changed, 40 insertions(+), 15 deletions(-) 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 964ba1a..1644f2a 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c @@ -268,24 +268,30 @@ bool resource_construct( return true; } +static int find_matching_clock_source( + const struct resource_pool *pool, + struct clock_source *clock_source) +{ + + int i; + for (i = 0; i < pool->clk_src_count; i++) { + if (pool->clock_sources[i] == clock_source) + return i; + } + return -1; +} void resource_unreference_clock_source( struct resource_context *res_ctx, const struct resource_pool *pool, struct clock_source *clock_source) { - int i; - - for (i = 0; i < pool->clk_src_count; i++) { - if (pool->clock_sources[i] != clock_source) - continue; + int i = find_matching_clock_source(pool, clock_source); + if (i > -1) res_ctx->clock_source_ref_count[i]--; - break; - } - if (pool->dp_clock_source == clock_source) res_ctx->dp_clock_source_ref_count--; } @@ -295,19 +301,31 @@ void resource_reference_clock_source( const struct resource_pool *pool, struct clock_source *clock_source) { - int i; - for (i = 0; i < pool->clk_src_count; i++) { - if (pool->clock_sources[i] != clock_source) - continue; + int i = find_matching_clock_source(pool, clock_source); + if (i > -1) res_ctx->clock_source_ref_count[i]++; - break; - } if (pool->dp_clock_source == clock_source) res_ctx->dp_clock_source_ref_count++; } +int resource_get_clock_source_reference( + struct resource_context *res_ctx, + const struct resource_pool *pool, + struct clock_source *clock_source) +{ + int i = find_matching_clock_source(pool, clock_source); + + if (i > -1) + return res_ctx->clock_source_ref_count[i]; + + if (pool->dp_clock_source == clock_source) + return res_ctx->dp_clock_source_ref_count; + + return -1; +} + bool resource_are_streams_timing_synchronizable( struct dc_stream_state *stream1, struct dc_stream_state *stream2) 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 1d98e36..5450d4d 100644 --- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c +++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c @@ -1908,7 +1908,9 @@ static void dce110_reset_hw_ctx_wrap( pipe_ctx_old->plane_res.mi->funcs->free_mem_input( pipe_ctx_old->plane_res.mi, dc->current_state->stream_count); - if (old_clk) + if (old_clk && 0 == resource_get_clock_source_reference(&context->res_ctx, + dc->res_pool, + old_clk)) old_clk->funcs->cs_power_down(old_clk); dc->hwss.disable_plane(dc, pipe_ctx_old); diff --git a/drivers/gpu/drm/amd/display/dc/inc/resource.h b/drivers/gpu/drm/amd/display/dc/inc/resource.h index e92facb..5b32100 100644 --- a/drivers/gpu/drm/amd/display/dc/inc/resource.h +++ b/drivers/gpu/drm/amd/display/dc/inc/resource.h @@ -103,6 +103,11 @@ void resource_reference_clock_source( const struct resource_pool *pool, struct clock_source *clock_source); +int resource_get_clock_source_reference( + struct resource_context *res_ctx, + const struct resource_pool *pool, + struct clock_source *clock_source); + bool resource_are_streams_timing_synchronizable( struct dc_stream_state *stream1, struct dc_stream_state *stream2); -- 2.7.4