From: Michael Strauss michael.strauss@amd.com
commit 54149d13f369e1ab02f36b91feee02069184c1d8 upstream.
[WHY] On certain configs, SMU clock table voltages don't match which cause parser to behave incorrectly by leaving dcfclk and socclk table entries unpopulated.
[HOW] Currently the function that finds the corresponding clock for a given voltage only checks for exact voltage level matches. In the case that no match gets found, parser now falls back to searching for the max clock which meets the requested voltage (i.e. its corresponding voltage is below requested).
Signed-off-by: Michael Strauss michael.strauss@amd.com Reviewed-by: Nicholas Kazlauskas nicholas.kazlauskas@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c | 13 ++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c @@ -518,14 +518,21 @@ static unsigned int find_clk_for_voltage unsigned int voltage) { int i; + int max_voltage = 0; + int clock = 0;
for (i = 0; i < NUM_SOC_VOLTAGE_LEVELS; i++) { - if (clock_table->SocVoltage[i] == voltage) + if (clock_table->SocVoltage[i] == voltage) { return clocks[i]; + } else if (clock_table->SocVoltage[i] >= max_voltage && + clock_table->SocVoltage[i] < voltage) { + max_voltage = clock_table->SocVoltage[i]; + clock = clocks[i]; + } }
- ASSERT(0); - return 0; + ASSERT(clock); + return clock; }
void dcn31_clk_mgr_helper_populate_bw_params(