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Commit 4769b598 authored by Madhav Chauhan's avatar Madhav Chauhan Committed by Jani Nikula
Browse files

drm/i915/icl: Put DSI link in ULPS 



As part of DSI disabling sequence, DSI link need to enter
in ULPS by writing into DSI_LP_MSG register. This patch
does the same using a wrapper function.

Signed-off-by: default avatarMadhav Chauhan <madhav.chauhan@intel.com>
Reviewed-by: default avatarJani Nikula <jani.nikula@intel.com>
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/50812f4bd37f95c053bef7eef4a95e5da029546f.1540900289.git.jani.nikula@intel.com
parent 522cc3f7

drivers/gpu/drm/i915/icl_dsi.c

+26 −0
Original line number Diff line number Diff line
@@ -812,6 +812,29 @@ static void gen11_dsi_powerdown_panel(struct intel_encoder *encoder) 
	wait_for_cmds_dispatched_to_panel(encoder);

}



static void gen11_dsi_deconfigure_trancoder(struct intel_encoder *encoder)

{

	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);

	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);

	enum port port;

	enum transcoder dsi_trans;

	u32 tmp;



	/* put dsi link in ULPS */

	for_each_dsi_port(port, intel_dsi->ports) {

		dsi_trans = dsi_port_to_transcoder(port);

		tmp = I915_READ(DSI_LP_MSG(dsi_trans));

		tmp |= LINK_ENTER_ULPS;

		tmp &= ~LINK_ULPS_TYPE_LP11;

		I915_WRITE(DSI_LP_MSG(dsi_trans), tmp);



		if (wait_for_us((I915_READ(DSI_LP_MSG(dsi_trans)) &

				LINK_IN_ULPS),

				10))

			DRM_ERROR("DSI link not in ULPS\n");

	}

}



static void __attribute__((unused)) gen11_dsi_disable(

			struct intel_encoder *encoder,

			const struct intel_crtc_state *old_crtc_state,
@@ -828,4 +851,7 @@ static void __attribute__((unused)) gen11_dsi_disable( 


	/* step2f,g: powerdown panel */

	gen11_dsi_powerdown_panel(encoder);



	/* step2h,i,j: deconfig trancoder */

	gen11_dsi_deconfigure_trancoder(encoder);

}