[alsa-devel] [PATCH 2/2] drm/i915: pass ELD to HDMI/DP audio driver
Wu Fengguang
fengguang.wu at intel.com
Mon Sep 5 08:25:34 CEST 2011
Add ELD support for Intel Eaglelake, IbexPeak/Ironlake,
SandyBridge/CougarPoint and IvyBridge/PantherPoint chips.
ELD (EDID-Like Data) describes to the HDMI/DP audio driver the audio
capabilities of the plugged monitor. It's built and passed to audio
driver in 2 steps:
(1) at get_modes time, parse EDID and save ELD to drm_connector.eld[]
(2) at mode_set time, write drm_connector.eld[] to the Transcoder's hw
ELD buffer and set the ELD_valid bit to inform HDMI/DP audio driver
This patch is tested OK on G45/HDMI, IbexPeak/HDMI and IvyBridge/HDMI+DP.
Test scheme: plug in the HDMI/DP monitor, and run
cat /proc/asound/card0/eld*
to check if the monitor name, HDMI/DP type, etc. show up correctly.
Minor imperfection: the GEN5_AUD_CNTL_ST/DIP_Port_Select field always
reads 0 (reserved). Without knowing the port number, I worked it around
by setting the ELD_valid bit for ALL the three ports. It's tested to not
be a problem, because the audio driver will find invalid ELD data and
hence rightfully abort, even when it sees the ELD_valid indicator.
Thanks to Zhenyu and Pierre-Louis for a lot of valuable help and testing.
CC: Zhao Yakui <yakui.zhao at intel.com>
CC: Wang Zhenyu <zhenyu.z.wang at intel.com>
CC: Jeremy Bush <contractfrombelow at gmail.com>
CC: Christopher White <c.white at pulseforce.com>
CC: Pierre-Louis Bossart <pierre-louis.bossart at intel.com>
CC: Paul Menzel <paulepanter at users.sourceforge.net>
Signed-off-by: Wu Fengguang <fengguang.wu at intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 2
drivers/gpu/drm/i915/i915_reg.h | 25 ++++
drivers/gpu/drm/i915/intel_display.c | 131 ++++++++++++++++++++++++-
drivers/gpu/drm/i915/intel_dp.c | 6 -
drivers/gpu/drm/i915/intel_drv.h | 2
drivers/gpu/drm/i915/intel_hdmi.c | 3
drivers/gpu/drm/i915/intel_modes.c | 2
7 files changed, 169 insertions(+), 2 deletions(-)
--- linux-next.orig/drivers/gpu/drm/i915/intel_hdmi.c 2011-09-05 14:01:48.000000000 +0800
+++ linux-next/drivers/gpu/drm/i915/intel_hdmi.c 2011-09-05 14:02:57.000000000 +0800
@@ -245,8 +245,11 @@ static void intel_hdmi_mode_set(struct d
sdvox |= HDMI_MODE_SELECT;
if (intel_hdmi->has_audio) {
+ DRM_DEBUG_DRIVER("Enabling HDMI audio on pipe %c\n",
+ pipe_name(intel_crtc->pipe));
sdvox |= SDVO_AUDIO_ENABLE;
sdvox |= SDVO_NULL_PACKETS_DURING_VSYNC;
+ intel_write_eld(encoder, adjusted_mode);
}
if (intel_crtc->pipe == 1) {
--- linux-next.orig/drivers/gpu/drm/i915/intel_display.c 2011-09-05 14:01:48.000000000 +0800
+++ linux-next/drivers/gpu/drm/i915/intel_display.c 2011-09-05 14:02:57.000000000 +0800
@@ -31,6 +31,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vgaarb.h>
+#include <drm/drm_edid.h>
#include "drmP.h"
#include "intel_drv.h"
#include "i915_drm.h"
@@ -5667,6 +5668,131 @@ static int intel_crtc_mode_set(struct dr
return ret;
}
+static void g4x_write_eld(struct drm_connector *connector,
+ struct drm_crtc *crtc)
+{
+ struct drm_i915_private *dev_priv = connector->dev->dev_private;
+ uint8_t *eld = connector->eld;
+ uint32_t eldv;
+ uint32_t len;
+ uint32_t i;
+
+ i = I915_READ(G4X_AUD_VID_DID);
+
+ if (i == INTEL_AUDIO_DEVBLC || i == INTEL_AUDIO_DEVCL)
+ eldv = G4X_ELDV_DEVCL_DEVBLC;
+ else
+ eldv = G4X_ELDV_DEVCTG;
+
+ i = I915_READ(G4X_AUD_CNTL_ST);
+ i &= ~(eldv | G4X_ELD_ADDR);
+ len = (i >> 9) & 0x1f; /* ELD buffer size */
+ I915_WRITE(G4X_AUD_CNTL_ST, i);
+
+ if (!eld[0])
+ return;
+
+ len = min_t(uint8_t, eld[2], len);
+ DRM_DEBUG_DRIVER("ELD size %d\n", len);
+ for (i = 0; i < len; i++)
+ I915_WRITE(G4X_HDMIW_HDMIEDID, *((uint32_t *)eld + i));
+
+ i = I915_READ(G4X_AUD_CNTL_ST);
+ i |= eldv;
+ I915_WRITE(G4X_AUD_CNTL_ST, i);
+}
+
+static void ironlake_write_eld(struct drm_connector *connector,
+ struct drm_crtc *crtc)
+{
+ struct drm_i915_private *dev_priv = connector->dev->dev_private;
+ uint8_t *eld = connector->eld;
+ uint32_t eldv;
+ uint32_t i;
+ int len;
+ int hdmiw_hdmiedid;
+ int aud_cntl_st;
+ int aud_cntrl_st2;
+
+ if (IS_IVYBRIDGE(connector->dev)) {
+ hdmiw_hdmiedid = GEN7_HDMIW_HDMIEDID_A;
+ aud_cntl_st = GEN7_AUD_CNTRL_ST_A;
+ aud_cntrl_st2 = GEN7_AUD_CNTRL_ST2;
+ } else {
+ hdmiw_hdmiedid = GEN5_HDMIW_HDMIEDID_A;
+ aud_cntl_st = GEN5_AUD_CNTL_ST_A;
+ aud_cntrl_st2 = GEN5_AUD_CNTL_ST2;
+ }
+
+ i = to_intel_crtc(crtc)->pipe;
+ hdmiw_hdmiedid += i * 0x100;
+ aud_cntl_st += i * 0x100;
+
+ DRM_DEBUG_DRIVER("ELD on pipe %c\n", pipe_name(i));
+
+ i = I915_READ(aud_cntl_st);
+ i = (i >> 29) & 0x3; /* DIP_Port_Select, 0x1 = PortB */
+ if (!i) {
+ DRM_DEBUG_DRIVER("Audio directed to unknown port\n");
+ /* operate blindly on all ports */
+ eldv = GEN5_ELD_VALIDB;
+ eldv |= GEN5_ELD_VALIDB << 4;
+ eldv |= GEN5_ELD_VALIDB << 8;
+ } else {
+ DRM_DEBUG_DRIVER("ELD on port %c\n", 'A' + i);
+ eldv = GEN5_ELD_VALIDB << ((i - 1) * 4);
+ }
+
+ i = I915_READ(aud_cntrl_st2);
+ i &= ~eldv;
+ I915_WRITE(aud_cntrl_st2, i);
+
+ if (!eld[0])
+ return;
+
+ if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT)) {
+ DRM_DEBUG_DRIVER("ELD: DisplayPort detected\n");
+ eld[5] |= (1 << 2); /* Conn_Type, 0x1 = DisplayPort */
+ }
+
+ i = I915_READ(aud_cntl_st);
+ i &= ~GEN5_ELD_ADDRESS;
+ I915_WRITE(aud_cntl_st, i);
+
+ len = min_t(uint8_t, eld[2], 21); /* 84 bytes of hw ELD buffer */
+ DRM_DEBUG_DRIVER("ELD size %d\n", len);
+ for (i = 0; i < len; i++)
+ I915_WRITE(hdmiw_hdmiedid, *((uint32_t *)eld + i));
+
+ i = I915_READ(aud_cntrl_st2);
+ i |= eldv;
+ I915_WRITE(aud_cntrl_st2, i);
+}
+
+void intel_write_eld(struct drm_encoder *encoder,
+ struct drm_display_mode *mode)
+{
+ struct drm_crtc *crtc = encoder->crtc;
+ struct drm_connector *connector;
+ struct drm_device *dev = encoder->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ connector = drm_select_eld(encoder, mode);
+ if (!connector)
+ return;
+
+ DRM_DEBUG_DRIVER("ELD on [CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
+ connector->base.id,
+ drm_get_connector_name(connector),
+ connector->encoder->base.id,
+ drm_get_encoder_name(connector->encoder));
+
+ connector->eld[6] = drm_av_sync_delay(connector, mode) / 2;
+
+ if (dev_priv->display.write_eld)
+ dev_priv->display.write_eld(connector, crtc);
+}
+
/** Loads the palette/gamma unit for the CRTC with the prepared values */
void intel_crtc_load_lut(struct drm_crtc *crtc)
{
@@ -8183,6 +8309,7 @@ static void intel_init_display(struct dr
}
dev_priv->display.fdi_link_train = ironlake_fdi_link_train;
dev_priv->display.init_clock_gating = ironlake_init_clock_gating;
+ dev_priv->display.write_eld = ironlake_write_eld;
} else if (IS_GEN6(dev)) {
if (SNB_READ_WM0_LATENCY()) {
dev_priv->display.update_wm = sandybridge_update_wm;
@@ -8193,6 +8320,7 @@ static void intel_init_display(struct dr
}
dev_priv->display.fdi_link_train = gen6_fdi_link_train;
dev_priv->display.init_clock_gating = gen6_init_clock_gating;
+ dev_priv->display.write_eld = ironlake_write_eld;
} else if (IS_IVYBRIDGE(dev)) {
/* FIXME: detect B0+ stepping and use auto training */
dev_priv->display.fdi_link_train = ivb_manual_fdi_link_train;
@@ -8204,7 +8332,7 @@ static void intel_init_display(struct dr
dev_priv->display.update_wm = NULL;
}
dev_priv->display.init_clock_gating = ivybridge_init_clock_gating;
-
+ dev_priv->display.write_eld = ironlake_write_eld;
} else
dev_priv->display.update_wm = NULL;
} else if (IS_PINEVIEW(dev)) {
@@ -8224,6 +8352,7 @@ static void intel_init_display(struct dr
dev_priv->display.update_wm = pineview_update_wm;
dev_priv->display.init_clock_gating = gen3_init_clock_gating;
} else if (IS_G4X(dev)) {
+ dev_priv->display.write_eld = g4x_write_eld;
dev_priv->display.update_wm = g4x_update_wm;
dev_priv->display.init_clock_gating = g4x_init_clock_gating;
} else if (IS_GEN4(dev)) {
--- linux-next.orig/drivers/gpu/drm/i915/i915_reg.h 2011-09-05 14:01:48.000000000 +0800
+++ linux-next/drivers/gpu/drm/i915/i915_reg.h 2011-09-05 14:02:57.000000000 +0800
@@ -3470,4 +3470,29 @@
#define GEN6_PCODE_DATA 0x138128
#define GEN6_PCODE_FREQ_IA_RATIO_SHIFT 8
+#define G4X_AUD_VID_DID 0x62020
+#define INTEL_AUDIO_DEVCL 0x808629FB
+#define INTEL_AUDIO_DEVBLC 0x80862801
+#define INTEL_AUDIO_DEVCTG 0x80862802
+
+#define G4X_AUD_CNTL_ST 0x620B4
+#define G4X_ELDV_DEVCL_DEVBLC (1 << 13)
+#define G4X_ELDV_DEVCTG (1 << 14)
+#define G4X_ELD_ADDR (0xf << 5)
+#define G4X_ELD_ACK (1 << 4)
+#define G4X_HDMIW_HDMIEDID 0x6210C
+
+#define GEN5_HDMIW_HDMIEDID_A 0xE2050
+#define GEN5_AUD_CNTL_ST_A 0xE20B4
+#define GEN5_ELD_BUFFER_SIZE (0x1f << 10)
+#define GEN5_ELD_ADDRESS (0x1f << 5)
+#define GEN5_ELD_ACK (1 << 4)
+#define GEN5_AUD_CNTL_ST2 0xE20C0
+#define GEN5_ELD_VALIDB (1 << 0)
+#define GEN5_CP_READYB (1 << 1)
+
+#define GEN7_HDMIW_HDMIEDID_A 0xE5050
+#define GEN7_AUD_CNTRL_ST_A 0xE50B4
+#define GEN7_AUD_CNTRL_ST2 0xE50C0
+
#endif /* _I915_REG_H_ */
--- linux-next.orig/drivers/gpu/drm/i915/intel_drv.h 2011-09-05 14:01:48.000000000 +0800
+++ linux-next/drivers/gpu/drm/i915/intel_drv.h 2011-09-05 14:02:57.000000000 +0800
@@ -380,4 +380,6 @@ extern void intel_fb_output_poll_changed
extern void intel_fb_restore_mode(struct drm_device *dev);
extern void intel_init_clock_gating(struct drm_device *dev);
+extern void intel_write_eld(struct drm_encoder *encoder,
+ struct drm_display_mode *mode);
#endif /* __INTEL_DRV_H__ */
--- linux-next.orig/drivers/gpu/drm/i915/intel_modes.c 2011-09-05 14:01:48.000000000 +0800
+++ linux-next/drivers/gpu/drm/i915/intel_modes.c 2011-09-05 14:02:57.000000000 +0800
@@ -26,6 +26,7 @@
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/fb.h>
+#include <drm/drm_edid.h>
#include "drmP.h"
#include "intel_drv.h"
#include "i915_drv.h"
@@ -74,6 +75,7 @@ int intel_ddc_get_modes(struct drm_conne
if (edid) {
drm_mode_connector_update_edid_property(connector, edid);
ret = drm_add_edid_modes(connector, edid);
+ drm_edid_to_eld(connector, edid);
connector->display_info.raw_edid = NULL;
kfree(edid);
}
--- linux-next.orig/drivers/gpu/drm/i915/intel_dp.c 2011-09-05 14:01:48.000000000 +0800
+++ linux-next/drivers/gpu/drm/i915/intel_dp.c 2011-09-05 14:02:57.000000000 +0800
@@ -773,8 +773,12 @@ intel_dp_mode_set(struct drm_encoder *en
intel_dp->DP |= DP_PORT_WIDTH_4;
break;
}
- if (intel_dp->has_audio)
+ if (intel_dp->has_audio) {
+ DRM_DEBUG_DRIVER("Enabling DP audio on pipe %c\n",
+ pipe_name(intel_crtc->pipe));
intel_dp->DP |= DP_AUDIO_OUTPUT_ENABLE;
+ intel_write_eld(encoder, adjusted_mode);
+ }
memset(intel_dp->link_configuration, 0, DP_LINK_CONFIGURATION_SIZE);
intel_dp->link_configuration[0] = intel_dp->link_bw;
--- linux-next.orig/drivers/gpu/drm/i915/i915_drv.h 2011-09-05 14:01:48.000000000 +0800
+++ linux-next/drivers/gpu/drm/i915/i915_drv.h 2011-09-05 14:02:57.000000000 +0800
@@ -209,6 +209,8 @@ struct drm_i915_display_funcs {
struct drm_display_mode *adjusted_mode,
int x, int y,
struct drm_framebuffer *old_fb);
+ void (*write_eld)(struct drm_connector *connector,
+ struct drm_crtc *crtc);
void (*fdi_link_train)(struct drm_crtc *crtc);
void (*init_clock_gating)(struct drm_device *dev);
void (*init_pch_clock_gating)(struct drm_device *dev);
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