Geminilake platform sports a native HDMI 2.0 controller, and is
capable of driving pixel-clocks upto 594Mhz. HDMI 2.0 spec
mendates scrambling for these higher clocks, for reduced RF footprint.
This patch checks if the monitor supports scrambling, and if required,
enables it during the modeset.
V2: Addressed review comments from Ville:
- Do not track scrambling status in DRM layer, track somewhere in
driver like in intel_crtc_state.
- Don't talk to monitor at such a low layer, set monitor scrambling
in intel_enable_ddi() before enabling the port.
V3: Addressed review comments from Jani
- In comments, function names, use "sink" instead of "monitor",
so that the implementation could be close to the language of
HDMI spec.
V4: Addressed review comment from Maarten
- scrambling -> hdmi_scrambling
high_tmds_clock_ratio -> hdmi_high_tmds_clock_ratio
V5: Addressed review comments from Ville and Ander
- Do not modifiy the crtc_state after compute_config. Move all
scrambling and tmds_clock_ratio calcutations to compute_config.
- While setting scrambling for source/sink, do not check the
conditions again, just go by the crtc_state flags. This will
simplyfy the condition checks.
V6: Addressed review comments from Ville
- Do not add IS_GLK check in disable/enable function, instead add it
in compute_config, while setting state flags.
- Remove unnecessary paranthesis.
- Simplyfy handle_sink_scrambling function as suggested.
- Add readout code for scrambling status in get_ddi_config and add a
check for the same in pipe_config_compare.
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 7 ++++
drivers/gpu/drm/i915/intel_ddi.c | 33 ++++++++++++++++
drivers/gpu/drm/i915/intel_display.c | 5 +++
drivers/gpu/drm/i915/intel_drv.h | 14 +++++++
drivers/gpu/drm/i915/intel_hdmi.c | 74 ++++++++++++++++++++++++++++++++++++
5 files changed, 133 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 4906ce4d..f7891ac 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7824,7 +7824,14 @@ enum {
#define TRANS_DDI_EDP_INPUT_B_ONOFF (5<<12)
#define TRANS_DDI_EDP_INPUT_C_ONOFF (6<<12)
#define TRANS_DDI_DP_VC_PAYLOAD_ALLOC (1<<8)
+#define TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE (1<<7)
+#define TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ (1<<6)
#define TRANS_DDI_BFI_ENABLE (1<<4)
+#define TRANS_DDI_HIGH_TMDS_CHAR_RATE (1<<4)
+#define TRANS_DDI_HDMI_SCRAMBLING (1<<0)
+#define TRANS_DDI_HDMI_SCRAMBLING_MASK (TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE \
+ | TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ \
+ | TRANS_DDI_HDMI_SCRAMBLING)
/* DisplayPort Transport Control */
#define _DP_TP_CTL_A 0x64040
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index a7c08d7..d0c6927 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1311,6 +1311,11 @@ void intel_ddi_enable_transcoder_func(struct drm_crtc *crtc)
temp |= TRANS_DDI_MODE_SELECT_HDMI;
else
temp |= TRANS_DDI_MODE_SELECT_DVI;
+
+ if (IS_GEMINILAKE(dev_priv))
+ temp = intel_hdmi_handle_source_scrambling(
+ intel_encoder,
+ intel_crtc->config, temp);
} else if (type == INTEL_OUTPUT_ANALOG) {
temp |= TRANS_DDI_MODE_SELECT_FDI;
temp |= (intel_crtc->config->fdi_lanes - 1) << 1;
@@ -1885,6 +1890,21 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder,
struct intel_digital_port *intel_dig_port =
enc_to_dig_port(encoder);
+ if (IS_GEMINILAKE(dev_priv)) {
+ struct intel_crtc *crtc = to_intel_crtc(encoder->crtc);
+ /*
+ * GLK sports a native HDMI 2.0 controller. If required
+ * clock rate is > 340 Mhz && scrambling is supported
+ * by sink, enable scrambling before enabling the
+ * HDMI 2.0 port. The sink can choose to disable the
+ * scrambling if it doesn't detect a scrambled within
+ * 100 ms.
+ */
+ intel_hdmi_handle_sink_scrambling(intel_encoder,
+ conn_state->connector,
+ crtc->config, true);
+ }
+
/* In HDMI/DVI mode, the port width, and swing/emphasis values
* are ignored so nothing special needs to be done besides
* enabling the port.
@@ -1917,6 +1937,14 @@ static void intel_disable_ddi(struct intel_encoder *intel_encoder,
if (old_crtc_state->has_audio)
intel_audio_codec_disable(intel_encoder);
+ if (type == INTEL_OUTPUT_HDMI) {
+ struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
+
+ intel_hdmi_handle_sink_scrambling(intel_encoder,
+ old_conn_state->connector,
+ intel_crtc->config, false);
+ }
+
if (type == INTEL_OUTPUT_EDP) {
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
@@ -2044,6 +2072,11 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
if (intel_hdmi->infoframe_enabled(&encoder->base, pipe_config))
pipe_config->has_infoframe = true;
+
+ if (temp & TRANS_DDI_HDMI_SCRAMBLING_MASK)
+ pipe_config->hdmi_scrambling = true;
+ if (temp & TRANS_DDI_HIGH_TMDS_CHAR_RATE)
+ pipe_config->hdmi_high_tmds_clock_ratio = true;
/* fall through */
case TRANS_DDI_MODE_SELECT_DVI:
pipe_config->lane_count = 4;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 99e8d9c..c017ed3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11662,6 +11662,11 @@ static void __printf(3, 4)
if ((INTEL_GEN(dev_priv) < 8 && !IS_HASWELL(dev_priv)) ||
IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
PIPE_CONF_CHECK_I(limited_color_range);
+ if (IS_GEMINILAKE(dev_priv)) {
+ PIPE_CONF_CHECK_I(hdmi_scrambling);
+ PIPE_CONF_CHECK_I(hdmi_high_tmds_clock_ratio);
+ }
+
PIPE_CONF_CHECK_I(has_infoframe);
PIPE_CONF_CHECK_I(has_audio);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index e6fbbee..baefbaa 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -695,6 +695,12 @@ struct intel_crtc_state {
/* Gamma mode programmed on the pipe */
uint32_t gamma_mode;
+
+ /* HDMI scrambling status (sink) */
+ bool hdmi_scrambling;
+
+ /* HDMI High TMDS char rate ratio (sink) */
+ bool hdmi_high_tmds_clock_ratio;
};
struct vlv_wm_state {
@@ -1626,6 +1632,14 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
bool intel_hdmi_compute_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config,
struct drm_connector_state *conn_state);
+uint32_t
+intel_hdmi_handle_source_scrambling(struct intel_encoder *intel_encoder,
+ struct intel_crtc_state *config,
+ uint32_t hdmi_config);
+void intel_hdmi_handle_sink_scrambling(struct intel_encoder *intel_encoder,
+ struct drm_connector *connector,
+ struct intel_crtc_state *config,
+ bool enable);
void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable);
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index c2184f7..0a1ae03 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -34,6 +34,7 @@
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
+#include <drm/drm_scdc_helper.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include <drm/intel_lpe_audio.h>
@@ -1316,6 +1317,7 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
+ struct drm_scdc *scdc = &conn_state->connector->display_info.hdmi.scdc;
int clock_8bpc = pipe_config->base.adjusted_mode.crtc_clock;
int clock_12bpc = clock_8bpc * 3 / 2;
int desired_bpp;
@@ -1385,6 +1387,16 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
pipe_config->lane_count = 4;
+ if (scdc->scrambling.supported && IS_GEMINILAKE(dev_priv)) {
+ if (scdc->scrambling.low_rates)
+ pipe_config->hdmi_scrambling = true;
+
+ if (pipe_config->port_clock > 340000) {
+ pipe_config->hdmi_scrambling = true;
+ pipe_config->hdmi_high_tmds_clock_ratio = true;
+ }
+ }
+
return true;
}
@@ -1794,6 +1806,68 @@ static void intel_hdmi_destroy(struct drm_connector *connector)
intel_hdmi->aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
}
+void intel_hdmi_handle_sink_scrambling(struct intel_encoder *intel_encoder,
+ struct drm_connector *connector,
+ struct intel_crtc_state *config,
+ bool enable)
+{
+ struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&intel_encoder->base);
+ struct drm_i915_private *dev_priv = connector->dev->dev_private;
+ struct drm_scrambling *scrambling =
+ &connector->display_info.hdmi.scdc.scrambling;
+ struct i2c_adapter *adptr = intel_gmbus_get_adapter(dev_priv,
+ intel_hdmi->ddc_bus);
+ bool ret;
+
+ if (!scrambling->supported)
+ return;
+
+ DRM_DEBUG_KMS("Setting sink scrambling for enc:%s connector:%s\n",
+ intel_encoder->base.name, connector->name);
+
+ if (config->hdmi_high_tmds_clock_ratio) {
+ /* Set TMDS bit clock ratio to 1/40 or 1/10 */
+ ret = drm_scdc_set_high_tmds_clock_ratio(adptr, enable);
+ if (!ret) {
+ DRM_ERROR("Set TMDS ratio failed\n");
+ return;
+ }
+ }
+
+ if (config->hdmi_scrambling) {
+ /* Enable/disable sink scrambling */
+ ret = drm_scdc_set_scrambling(adptr, enable);
+ if (!ret) {
+ DRM_ERROR("Set sink scrambling failed\n");
+ return;
+ }
+ }
+
+ DRM_DEBUG_KMS("sink scrambling handled\n");
+}
+
+uint32_t
+intel_hdmi_handle_source_scrambling(struct intel_encoder *intel_encoder,
+ struct intel_crtc_state *config, uint32_t hdmi_config)
+{
+ struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&intel_encoder->base);
+ struct drm_connector *connector = &intel_hdmi->attached_connector->base;
+
+ DRM_DEBUG_KMS("Setting scrambling for enc:%s connector:%s\n",
+ intel_encoder->base.name, connector->name);
+
+ hdmi_config &= ~(TRANS_DDI_HDMI_SCRAMBLING_MASK |
+ TRANS_DDI_HIGH_TMDS_CHAR_RATE);
+
+ if (config->hdmi_scrambling)
+ hdmi_config |= TRANS_DDI_HDMI_SCRAMBLING_MASK;
+
+ if (config->hdmi_high_tmds_clock_ratio)
+ hdmi_config |= TRANS_DDI_HIGH_TMDS_CHAR_RATE;
+
+ return hdmi_config;
+}
+
static u8 intel_hdmi_ddc_pin(struct drm_i915_private *dev_priv,
enum port port)
{
--
1.9.1
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