[PATCH AUTOSEL 6.8 37/52] drm/amd/display: Add dtbclk access to dcn315

[Sasha Levin]

From: Swapnil Patel <swapnil.pa...@amd.com>

[ Upstream commit a01b64f31d65bdc917d1afb4cec9915beb6931be ]

[Why & How]

Currently DCN315 clk manager is missing code to enable/disable dtbclk.
Because of this, "optimized_required" flag is constantly set
and this prevents FreeSync from engaging for certain high bandwidth
display Modes which require DTBCLK.

Reviewed-by: Dmytro Laktyushkin <dmytro.laktyush...@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pil...@amd.com>
Signed-off-by: Swapnil Patel <swapnil.pa...@amd.com>
Tested-by: Daniel Wheeler <daniel.whee...@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 .../drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c    | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c 
b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c
index 644da46373209..5506cf9b3672f 100644
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c
@@ -145,6 +145,10 @@ static void dcn315_update_clocks(struct clk_mgr 
*clk_mgr_base,
         */
        clk_mgr_base->clks.zstate_support = new_clocks->zstate_support;
        if (safe_to_lower) {
+               if (clk_mgr_base->clks.dtbclk_en && !new_clocks->dtbclk_en) {
+                       dcn315_smu_set_dtbclk(clk_mgr, false);
+                       clk_mgr_base->clks.dtbclk_en = new_clocks->dtbclk_en;
+               }
                /* check that we're not already in lower */
                if (clk_mgr_base->clks.pwr_state != DCN_PWR_STATE_LOW_POWER) {
                        display_count = dcn315_get_active_display_cnt_wa(dc, 
context);
@@ -160,6 +164,10 @@ static void dcn315_update_clocks(struct clk_mgr 
*clk_mgr_base,
                        }
                }
        } else {
+               if (!clk_mgr_base->clks.dtbclk_en && new_clocks->dtbclk_en) {
+                       dcn315_smu_set_dtbclk(clk_mgr, true);
+                       clk_mgr_base->clks.dtbclk_en = new_clocks->dtbclk_en;
+               }
                /* check that we're not already in D0 */
                if (clk_mgr_base->clks.pwr_state != DCN_PWR_STATE_MISSION_MODE) 
{
                        union display_idle_optimization_u idle_info = { 0 };
-- 
2.43.0