[PATCH 5/6] drm/amd/powerplay: add sclk OD support on Tonga

[Alex Deucher]

From: Eric Huang <jinhuieric.hu...@amd.com>

This implements sclk overdrive(OD) overclocking support for Tonga,
and the maximum overdrive percentage is 20.

Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Eric Huang <JinHuiEric.Huang at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/powerplay/hwmgr/tonga_hwmgr.c | 44 +++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_hwmgr.c 
b/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_hwmgr.c
index cb28335..cf1fca4 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_hwmgr.c
@@ -6194,6 +6194,48 @@ static int tonga_print_clock_levels(struct pp_hwmgr 
*hwmgr,
        return size;
 }

+static int tonga_get_sclk_od(struct pp_hwmgr *hwmgr)
+{
+       struct tonga_hwmgr *data = (struct tonga_hwmgr *)(hwmgr->backend);
+       struct tonga_single_dpm_table *sclk_table = 
&(data->dpm_table.sclk_table);
+       struct tonga_single_dpm_table *golden_sclk_table =
+                       &(data->golden_dpm_table.sclk_table);
+       int value;
+
+       value = (sclk_table->dpm_levels[sclk_table->count - 1].value -
+                       golden_sclk_table->dpm_levels[golden_sclk_table->count 
- 1].value) *
+                       100 /
+                       golden_sclk_table->dpm_levels[golden_sclk_table->count 
- 1].value;
+
+       return value;
+}
+
+static int tonga_set_sclk_od(struct pp_hwmgr *hwmgr, uint32_t value)
+{
+       struct tonga_hwmgr *data = (struct tonga_hwmgr *)(hwmgr->backend);
+       struct tonga_single_dpm_table *golden_sclk_table =
+                       &(data->golden_dpm_table.sclk_table);
+       struct pp_power_state  *ps;
+       struct tonga_power_state  *tonga_ps;
+
+       if (value > 20)
+               value = 20;
+
+       ps = hwmgr->request_ps;
+
+       if (ps == NULL)
+               return -EINVAL;
+
+       tonga_ps = cast_phw_tonga_power_state(&ps->hardware);
+
+       tonga_ps->performance_levels[tonga_ps->performance_level_count - 
1].engine_clock =
+                       golden_sclk_table->dpm_levels[golden_sclk_table->count 
- 1].value *
+                       value / 100 +
+                       golden_sclk_table->dpm_levels[golden_sclk_table->count 
- 1].value;
+
+       return 0;
+}
+
 static const struct pp_hwmgr_func tonga_hwmgr_funcs = {
        .backend_init = &tonga_hwmgr_backend_init,
        .backend_fini = &tonga_hwmgr_backend_fini,
@@ -6236,6 +6278,8 @@ static const struct pp_hwmgr_func tonga_hwmgr_funcs = {
        .set_pp_table = tonga_set_pp_table,
        .force_clock_level = tonga_force_clock_level,
        .print_clock_levels = tonga_print_clock_levels,
+       .get_sclk_od = tonga_get_sclk_od,
+       .set_sclk_od = tonga_set_sclk_od,
 };

 int tonga_hwmgr_init(struct pp_hwmgr *hwmgr)
-- 
2.5.5