drm/i915: set AUD_CONFIG N_value_index for DisplayPort
It should be programmed to "0" for HDMI or "1" for DisplayPort.
This enables DisplayPort audio for
- HP EliteBook 8460p
(whose BIOS does not set the N_value_index bit for us)
- DisplayPort monitor hot plugged after boot
(otherwise most BIOS will fill the N_value_index bit for us)
Tested-by: Robert Lemaire <rlemaire@suse.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index bbad788..f4daa6e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3742,4 +3742,16 @@
*/
#define GEN7_SO_WRITE_OFFSET(n) (0x5280 + (n) * 4)
+#define IBX_AUD_CONFIG_A 0xe2000
+#define CPT_AUD_CONFIG_A 0xe5000
+#define AUD_CONFIG_N_VALUE_INDEX (1 << 29)
+#define AUD_CONFIG_N_PROG_ENABLE (1 << 28)
+#define AUD_CONFIG_UPPER_N_SHIFT 20
+#define AUD_CONFIG_UPPER_N_VALUE (0xff << 20)
+#define AUD_CONFIG_LOWER_N_SHIFT 4
+#define AUD_CONFIG_LOWER_N_VALUE (0xfff << 4)
+#define AUD_CONFIG_PIXEL_CLOCK_HDMI_SHIFT 16
+#define AUD_CONFIG_PIXEL_CLOCK_HDMI (0xf << 16)
+#define AUD_CONFIG_DISABLE_NCTS (1 << 3)
+
#endif /* _I915_REG_H_ */
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ebb3452..0770671 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6141,15 +6141,18 @@
uint32_t i;
int len;
int hdmiw_hdmiedid;
+ int aud_config;
int aud_cntl_st;
int aud_cntrl_st2;
if (HAS_PCH_IBX(connector->dev)) {
hdmiw_hdmiedid = IBX_HDMIW_HDMIEDID_A;
+ aud_config = IBX_AUD_CONFIG_A;
aud_cntl_st = IBX_AUD_CNTL_ST_A;
aud_cntrl_st2 = IBX_AUD_CNTL_ST2;
} else {
hdmiw_hdmiedid = CPT_HDMIW_HDMIEDID_A;
+ aud_config = CPT_AUD_CONFIG_A;
aud_cntl_st = CPT_AUD_CNTL_ST_A;
aud_cntrl_st2 = CPT_AUD_CNTRL_ST2;
}
@@ -6157,6 +6160,7 @@
i = to_intel_crtc(crtc)->pipe;
hdmiw_hdmiedid += i * 0x100;
aud_cntl_st += i * 0x100;
+ aud_config += i * 0x100;
DRM_DEBUG_DRIVER("ELD on pipe %c\n", pipe_name(i));
@@ -6176,7 +6180,9 @@
if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT)) {
DRM_DEBUG_DRIVER("ELD: DisplayPort detected\n");
eld[5] |= (1 << 2); /* Conn_Type, 0x1 = DisplayPort */
- }
+ I915_WRITE(aud_config, AUD_CONFIG_N_VALUE_INDEX); /* 0x1 = DP */
+ } else
+ I915_WRITE(aud_config, 0);
if (intel_eld_uptodate(connector,
aud_cntrl_st2, eldv,