[PATCH 08/32] drm/amd/display: Fix DML2 logic to set clk state to min

[Zaeem Mohamed]

From: Nicholas Susanto <nicholas.susa...@amd.com>

[Why]

When an eDP with high clock states is going into s0i3, stream_count is
0. This causes DML to not update the clks to the lowest state and
blocking us to enter s0i3 since eDP is out of vmin.

[How]

When stream_count is 0, set all the clocks to the lowest state.

Reviewed-by: Jun Lei <jun....@amd.com>
Acked-by: Zaeem Mohamed <zaeem.moha...@amd.com>
Signed-off-by: Nicholas Susanto <nicholas.susa...@amd.com>
---
 .../gpu/drm/amd/display/dc/dml2/dml2_wrapper.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.c 
b/drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.c
index 5fe1110c4816..17cc2fdd7d34 100644
--- a/drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.c
+++ b/drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.c
@@ -573,8 +573,24 @@ static bool dml2_validate_and_build_resource(const struct 
dc *in_dc, struct dc_s
        bool need_recalculation = false;
        uint32_t cstate_enter_plus_exit_z8_ns;
 
-       if (!context || context->stream_count == 0)
+       if (!context)
+               return true;
+
+       else if (context->stream_count == 0) {
+               unsigned int lowest_state_idx = 0;
+
+               out_clks.p_state_supported = true;
+               out_clks.dispclk_khz = (unsigned 
int)dml2->v20.dml_core_ctx.states.state_array[lowest_state_idx].dispclk_mhz * 
1000;
+               out_clks.dcfclk_khz = (unsigned 
int)dml2->v20.dml_core_ctx.states.state_array[lowest_state_idx].dcfclk_mhz * 
1000;
+               out_clks.fclk_khz = (unsigned 
int)dml2->v20.dml_core_ctx.states.state_array[lowest_state_idx].fabricclk_mhz * 
1000;
+               out_clks.uclk_mts = (unsigned 
int)dml2->v20.dml_core_ctx.states.state_array[lowest_state_idx].dram_speed_mts;
+               out_clks.phyclk_khz = (unsigned 
int)dml2->v20.dml_core_ctx.states.state_array[lowest_state_idx].phyclk_mhz * 
1000;
+               out_clks.socclk_khz = (unsigned 
int)dml2->v20.dml_core_ctx.states.state_array[lowest_state_idx].socclk_mhz * 
1000;
+               out_clks.ref_dtbclk_khz = (unsigned 
int)dml2->v20.dml_core_ctx.states.state_array[lowest_state_idx].dtbclk_mhz * 
1000;
+               context->bw_ctx.bw.dcn.clk.dtbclk_en = false;
+               dml2_copy_clocks_to_dc_state(&out_clks, context);
                return true;
+       }
 
        /* Zero out before each call before proceeding */
        memset(&dml2->v20.scratch, 0, sizeof(struct dml2_wrapper_scratch));
-- 
2.34.1