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drm/amd/display: Make sure line size is not zero in DCN2 line buffer size calculations 

[why]
'Divide by zero' error happens when line size happens to be zero.

[how]
The code that makes sure line size minimum value can be 1 was already
present in DCN1 part of the driver, this is mearly a port to DCN2.

Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nikola Cornij 2019-04-15 14:32:28 -04:00 committed by Alex Deucher
parent 7fad39ca4a
commit b01473e919
1 changed files with 13 additions and 4 deletions
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17
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dpp.c
View File

@ -251,14 +251,23 @@ void dscl2_calc_lb_num_partitions(
int *num_part_y,
int *num_part_c)
{
int memory_line_size_y, memory_line_size_c, memory_line_size_a,
lb_memory_size, lb_memory_size_c, lb_memory_size_a, num_partitions_a;
int line_size = scl_data->viewport.width < scl_data->recout.width ?
scl_data->viewport.width : scl_data->recout.width;
int line_size_c = scl_data->viewport_c.width < scl_data->recout.width ?
scl_data->viewport_c.width : scl_data->recout.width;
int memory_line_size_y = (line_size + 5) / 6; /* +5 to ceil */
int memory_line_size_c = (line_size_c + 5) / 6; /* +5 to ceil */
int memory_line_size_a = (line_size + 5) / 6; /* +5 to ceil */
int lb_memory_size, lb_memory_size_c, lb_memory_size_a, num_partitions_a;
if (line_size == 0)
line_size = 1;
if (line_size_c == 0)
line_size_c = 1;
memory_line_size_y = (line_size + 5) / 6; /* +5 to ceil */
memory_line_size_c = (line_size_c + 5) / 6; /* +5 to ceil */
memory_line_size_a = (line_size + 5) / 6; /* +5 to ceil */
if (lb_config == LB_MEMORY_CONFIG_1) {
lb_memory_size = 970;