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drm/amd/powerplay: fix a crash when overclocking Vega M

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commit 88bb16ad998a0395fe4b346b7d3f621aaa0a2324 upstream.

Avoid kernel crash when vddci_control is SMU7_VOLTAGE_CONTROL_NONE and
vddci_voltage_table is empty. It has been tested on Intel Hades Canyon
(i7-8809G).

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=208489
Fixes: ac7822b002 ("drm/amd/powerplay: add smumgr support for VEGAM (v2)")
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Qiu Wenbo <qiuwenbo@phytium.com.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Qiu Wenbo 2020-07-17 15:09:57 +08:00 • committed by Greg Kroah-Hartman
commit d1bab3cf71
1 changed files with 6 additions and 4 deletions
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10
drivers/gpu/drm/amd/powerplay/smumgr/vegam_smumgr.c
View file

@ -642,9 +642,6 @@ static int vegam_get_dependency_volt_by_clk(struct pp_hwmgr *hwmgr,
/* sclk is bigger than max sclk in the dependence table */
*voltage |= (dep_table->entries[i - 1].vddc * VOLTAGE_SCALE) << VDDC_SHIFT;
vddci = phm_find_closest_vddci(&(data->vddci_voltage_table),
(dep_table->entries[i - 1].vddc -
(uint16_t)VDDC_VDDCI_DELTA));
if (SMU7_VOLTAGE_CONTROL_NONE == data->vddci_control)
*voltage |= (data->vbios_boot_state.vddci_bootup_value *
@ -652,8 +649,13 @@ static int vegam_get_dependency_volt_by_clk(struct pp_hwmgr *hwmgr,
else if (dep_table->entries[i - 1].vddci)
*voltage |= (dep_table->entries[i - 1].vddci *
VOLTAGE_SCALE) << VDDC_SHIFT;
else
else {
vddci = phm_find_closest_vddci(&(data->vddci_voltage_table),
(dep_table->entries[i - 1].vddc -
(uint16_t)VDDC_VDDCI_DELTA));
*voltage |= (vddci * VOLTAGE_SCALE) << VDDCI_SHIFT;
}
if (SMU7_VOLTAGE_CONTROL_NONE == data->mvdd_control)
*mvdd = data->vbios_boot_state.mvdd_bootup_value * VOLTAGE_SCALE;