Commit 973deead authored by Jouni Högander's avatar Jouni Högander
Browse files

drm/i915/dmc: Add interface to block PKG C-state 



Add interface to block PKG C-state. This is needed to implement workaround
for underrun on idle PSR HW issue (Wa_16025596647).

Bspec: 74151
Signed-off-by: default avatarJouni Högander <jouni.hogander@intel.com>
Reviewed-by: default avatarMika Kahola <mika.kahola@intel.com>
Link: https://lore.kernel.org/r/20250414100508.1208774-6-jouni.hogander@intel.com
parent f991ef47

drivers/gpu/drm/i915/display/intel_dmc.c

+17 −0
Original line number Diff line number Diff line
@@ -516,6 +516,23 @@ void intel_dmc_disable_pipe(struct intel_display *display, enum pipe pipe) 
		intel_de_rmw(display, PIPEDMC_CONTROL(pipe), PIPEDMC_ENABLE, 0);

}



/**

 * intel_dmc_block_pkgc() - block PKG C-state

 * @display: display instance

 * @pipe: pipe which register use to block

 * @block: block/unblock

 *

 * This interface is target for Wa_16025596647 usage. I.e. to set/clear

 * PIPEDMC_BLOCK_PKGC_SW_BLOCK_PKGC_ALWAYS bit in PIPEDMC_BLOCK_PKGC_SW register.

 */

void intel_dmc_block_pkgc(struct intel_display *display, enum pipe pipe,

			  bool block)

{

	intel_de_rmw(display, PIPEDMC_BLOCK_PKGC_SW(pipe),

		     PIPEDMC_BLOCK_PKGC_SW_BLOCK_PKGC_ALWAYS, block ?

		     PIPEDMC_BLOCK_PKGC_SW_BLOCK_PKGC_ALWAYS : 0);

}



static bool is_dmc_evt_ctl_reg(struct intel_display *display,

			       enum intel_dmc_id dmc_id, i915_reg_t reg)

{

drivers/gpu/drm/i915/display/intel_dmc.h

+2 −0
Original line number Diff line number Diff line
@@ -18,6 +18,8 @@ void intel_dmc_load_program(struct intel_display *display); 
void intel_dmc_disable_program(struct intel_display *display);

void intel_dmc_enable_pipe(struct intel_display *display, enum pipe pipe);

void intel_dmc_disable_pipe(struct intel_display *display, enum pipe pipe);

void intel_dmc_block_pkgc(struct intel_display *display, enum pipe pipe,

			  bool block);

void intel_dmc_fini(struct intel_display *display);

void intel_dmc_suspend(struct intel_display *display);

void intel_dmc_resume(struct intel_display *display);