[PATCH 12/25] drm/amd/display: Set DFS bypass flags for dce110

[Bhawanpreet Lakha]

From: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>

[Why]

While there is support for using and quering DFS bypass clocks the
hardware is never notified to enter DFS bypass mode for dce110.

[How]

Add a flag that can be set when programming the display engine PLL
to enable DFS bypass mode. If this flag is set then the hardware is
notified to enter DFS bypass mode and the correct display engine clock
frequency can be acquired.

Change-Id: I3c37a38a3b52d0677ec13f211add371739914e5b
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland at amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>
---
 drivers/gpu/drm/amd/display/dc/bios/command_table.c     | 3 +++
 drivers/gpu/drm/amd/display/dc/dce/dce_clocks.c         | 3 +++
 drivers/gpu/drm/amd/display/include/bios_parser_types.h | 2 ++
 3 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/bios/command_table.c b/drivers/gpu/drm/amd/display/dc/bios/command_table.c
index 651e1fd4622f..2a72025838d0 100644
--- a/drivers/gpu/drm/amd/display/dc/bios/command_table.c
+++ b/drivers/gpu/drm/amd/display/dc/bios/command_table.c
@@ -2183,6 +2183,9 @@ static enum bp_result program_clock_v6(
 	if (bp_params->flags.SET_EXTERNAL_REF_DIV_SRC)
 		params.sPCLKInput.ucMiscInfo |= PIXEL_CLOCK_MISC_REF_DIV_SRC;
 
+	if (bp_params->flags.SET_DISPCLK_DFS_BYPASS)
+		params.sPCLKInput.ucMiscInfo |= PIXEL_CLOCK_V6_MISC_DPREFCLK_BYPASS;
+
 	if (EXEC_BIOS_CMD_TABLE(SetPixelClock, params)) {
 		/* True display clock is returned by VBIOS if DFS bypass
 		 * is enabled. */
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_clocks.c b/drivers/gpu/drm/amd/display/dc/dce/dce_clocks.c
index f17677971d0f..922f9577b6ce 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_clocks.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_clocks.c
@@ -249,6 +249,9 @@ static int dce_set_clock(
 	pxl_clk_params.target_pixel_clock = requested_clk_khz;
 	pxl_clk_params.pll_id = CLOCK_SOURCE_ID_DFS;
 
+	if (clk_dce->dfs_bypass_enabled)
+		pxl_clk_params.flags.SET_DISPCLK_DFS_BYPASS = true;
+
 	bp->funcs->program_display_engine_pll(bp, &pxl_clk_params);
 
 	if (clk_dce->dfs_bypass_enabled) {
diff --git a/drivers/gpu/drm/amd/display/include/bios_parser_types.h b/drivers/gpu/drm/amd/display/include/bios_parser_types.h
index 0840f69cde99..f8dbfa5b89f2 100644
--- a/drivers/gpu/drm/amd/display/include/bios_parser_types.h
+++ b/drivers/gpu/drm/amd/display/include/bios_parser_types.h
@@ -234,6 +234,8 @@ struct bp_pixel_clock_parameters {
 		uint32_t USE_E_CLOCK_AS_SOURCE_FOR_D_CLOCK:1;
 		/* Use external reference clock (refDivSrc for PLL) */
 		uint32_t SET_EXTERNAL_REF_DIV_SRC:1;
+		/* Use DFS bypass for Display clock. */
+		uint32_t SET_DISPCLK_DFS_BYPASS:1;
 		/* Force program PHY PLL only */
 		uint32_t PROGRAM_PHY_PLL_ONLY:1;
 		/* Support for YUV420 */
-- 
2.14.1