From: Madhav Chauhan <madhav.chau...@intel.com>
This patch configures DSI video mode dual link by
programming DSS_CTL registers.
v2: Use new bitfield definitions from Anusha's patch
Correct register to be programmed and use max
depth buffer value (James)
v3 by Jani:
- checkpatch fixes
Signed-off-by: Madhav Chauhan <madhav.chau...@intel.com>
Signed-off-by: Jani Nikula <jani.nik...@intel.com>
---
drivers/gpu/drm/i915/icl_dsi.c | 42 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 41 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c
index f935008ff960..2b576a70222f 100644
--- a/drivers/gpu/drm/i915/icl_dsi.c
+++ b/drivers/gpu/drm/i915/icl_dsi.c
@@ -257,6 +257,45 @@ static void dsi_program_swing_and_deemphasis(struct
intel_encoder *encoder)
}
}
+static void configure_dual_link_mode(struct intel_encoder *encoder,
+ const struct intel_crtc_state *pipe_config)
+{
+ struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+ struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+ u32 dss_ctl1;
+
+ dss_ctl1 = I915_READ(DSS_CTL1);
+ dss_ctl1 |= SPLITTER_ENABLE;
+ dss_ctl1 &= ~OVERLAP_PIXELS_MASK;
+ dss_ctl1 |= OVERLAP_PIXELS(intel_dsi->pixel_overlap);
+
+ if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {
+ const struct drm_display_mode *adjusted_mode =
+ &pipe_config->base.adjusted_mode;
+ u32 dss_ctl2;
+ u16 hactive = adjusted_mode->crtc_hdisplay;
+ u16 dl_buffer_depth;
+
+ dss_ctl1 &= ~DUAL_LINK_MODE_INTERLEAVE;
+ dl_buffer_depth = hactive / 2 + intel_dsi->pixel_overlap;
+
+ if (dl_buffer_depth > MAX_DL_BUFFER_TARGET_DEPTH)
+ DRM_ERROR("DL buffer depth exceed max value\n");
+
+ dss_ctl1 &= ~LEFT_DL_BUF_TARGET_DEPTH_MASK;
+ dss_ctl1 |= LEFT_DL_BUF_TARGET_DEPTH(dl_buffer_depth);
+ dss_ctl2 = I915_READ(DSS_CTL2);
+ dss_ctl2 &= ~RIGHT_DL_BUF_TARGET_DEPTH_MASK;
+ dss_ctl2 |= RIGHT_DL_BUF_TARGET_DEPTH(dl_buffer_depth);
+ I915_WRITE(DSS_CTL2, dss_ctl2);
+ } else {
+ /* Interleave */
+ dss_ctl1 |= DUAL_LINK_MODE_INTERLEAVE;
+ }
+
+ I915_WRITE(DSS_CTL1, dss_ctl1);
+}
+
static void gen11_dsi_program_esc_clk_div(struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
@@ -591,7 +630,8 @@ gen11_dsi_configure_transcoder(struct intel_encoder
*encoder,
I915_WRITE(TRANS_DDI_FUNC_CTL2(dsi_trans), tmp);
}
- //TODO: configure DSS_CTL1
+ /* configure stream splitting */
+ configure_dual_link_mode(encoder, pipe_config);
}
for_each_dsi_port(port, intel_dsi->ports) {
--
2.11.0
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