diff options
| author | Samson Tam <Samson.Tam@amd.com> | 2023-04-20 01:17:14 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2023-05-04 06:10:02 +0300 |
| commit | 682439fffad9fa9a38d37dd1b1318e9374232213 (patch) | |
| tree | 178ddc95eefdeb8550cd843ad8c62a6002f24a81 /drivers | |
| parent | 8f586cc16c1fc3c2202c9d54563db8c7ed365f82 (diff) | |
| download | linux-682439fffad9fa9a38d37dd1b1318e9374232213.tar.xz | |
drm/amd/display: filter out invalid bits in pipe_fuses
[Why]
Reading pipe_fuses from register may have invalid bits set, which may
affect the num_pipes erroneously.
[How]
Add read_pipes_fuses() call and filter bits based on expected number
of pipes.
Reviewed-by: Alvin Lee <Alvin.Lee2@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Samson Tam <Samson.Tam@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.1.x
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c | 10 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c | 10 |
2 files changed, 18 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c index a876e6eb6cd8..22dd1ebea618 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c +++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c @@ -2079,6 +2079,14 @@ static struct resource_funcs dcn32_res_pool_funcs = { .restore_mall_state = dcn32_restore_mall_state, }; +static uint32_t read_pipe_fuses(struct dc_context *ctx) +{ + uint32_t value = REG_READ(CC_DC_PIPE_DIS); + /* DCN32 support max 4 pipes */ + value = value & 0xf; + return value; +} + static bool dcn32_resource_construct( uint8_t num_virtual_links, @@ -2122,7 +2130,7 @@ static bool dcn32_resource_construct( pool->base.res_cap = &res_cap_dcn32; /* max number of pipes for ASIC before checking for pipe fuses */ num_pipes = pool->base.res_cap->num_timing_generator; - pipe_fuses = REG_READ(CC_DC_PIPE_DIS); + pipe_fuses = read_pipe_fuses(ctx); for (i = 0; i < pool->base.res_cap->num_timing_generator; i++) if (pipe_fuses & 1 << i) diff --git a/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c b/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c index e5ab7f3077c4..a60ddb343d13 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c +++ b/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c @@ -1632,6 +1632,14 @@ static struct resource_funcs dcn321_res_pool_funcs = { .restore_mall_state = dcn32_restore_mall_state, }; +static uint32_t read_pipe_fuses(struct dc_context *ctx) +{ + uint32_t value = REG_READ(CC_DC_PIPE_DIS); + /* DCN321 support max 4 pipes */ + value = value & 0xf; + return value; +} + static bool dcn321_resource_construct( uint8_t num_virtual_links, @@ -1674,7 +1682,7 @@ static bool dcn321_resource_construct( pool->base.res_cap = &res_cap_dcn321; /* max number of pipes for ASIC before checking for pipe fuses */ num_pipes = pool->base.res_cap->num_timing_generator; - pipe_fuses = REG_READ(CC_DC_PIPE_DIS); + pipe_fuses = read_pipe_fuses(ctx); for (i = 0; i < pool->base.res_cap->num_timing_generator; i++) if (pipe_fuses & 1 << i) |