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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: Madhav Chauhan <madhav.chauhan@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/50812f4bd37f95c053bef7eef4a95e5da029546f.1540900289.git.jani.nikula@intel.com
This commit is contained in:
Madhav Chauhan 2018-10-30 13:56:16 +02:00 committed by Jani Nikula
parent 522cc3f717
commit 4769b598b9
1 changed files with 26 additions and 0 deletions
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26
drivers/gpu/drm/i915/icl_dsi.c
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@ -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);
}