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drm/amd/display: add sanity check for clk table from smu

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[Why]
Handle the case where we don't get a valid table. Also fixes compiler
warning for variable potentially used before assignment.

[How]
If the entire table has no valid fclk, reject the table and use our own
hard code.

Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eric Yang
2019-10-03 15:06:01 -04:00
committed by Alex Deucher
parent bfbacdae0a
commit 2ffb174b1d
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
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@@ -546,6 +546,8 @@ void rn_clk_mgr_helper_populate_bw_params(struct clk_bw_params *bw_params, struc
{
int i, j = 0;
j = -1;
ASSERT(PP_SMU_NUM_FCLK_DPM_LEVELS <= MAX_NUM_DPM_LVL);
/* Find lowest DPM, FCLK is filled in reverse order*/
@@ -557,6 +559,12 @@ void rn_clk_mgr_helper_populate_bw_params(struct clk_bw_params *bw_params, struc
}
}
if (j == -1) {
/* clock table is all 0s, just use our own hardcode */
ASSERT(0);
return;
}
bw_params->clk_table.num_entries = j + 1;
for (i = 0; i < bw_params->clk_table.num_entries; i++, j--) {