drm/i915: set HDMI pixel clock in audio configuration

The HDMI audio expects HDMI pixel clock to be set in the audio
configuration. We've currently just set 0, using 25.2 / 1.001 kHz
frequency, which fails with some modes.

v2: Now with a commit message.

Reference: http://mid.gmane.org/CAGpEb3Ep1LRZETPxHGRfBDqr5Ts2tAc8gCukWwugUf1U5NYv1g@mail.gmail.com
Reference: http://mid.gmane.org/20130206213533.GA16367@hardeman.nu
Reported-by: David Härdeman <david@hardeman.nu>
Reported-by: Jasper Smet <josbeir@gmail.com>
Tested-by: Jasper Smet <josbeir@gmail.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.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 8161521..b0f77a2 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4901,7 +4901,17 @@
 #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_PIXEL_CLOCK_HDMI_MASK     (0xf << 16)
+#define   AUD_CONFIG_PIXEL_CLOCK_HDMI_25175    (0 << 16)
+#define   AUD_CONFIG_PIXEL_CLOCK_HDMI_25200    (1 << 16)
+#define   AUD_CONFIG_PIXEL_CLOCK_HDMI_27000    (2 << 16)
+#define   AUD_CONFIG_PIXEL_CLOCK_HDMI_27027    (3 << 16)
+#define   AUD_CONFIG_PIXEL_CLOCK_HDMI_54000    (4 << 16)
+#define   AUD_CONFIG_PIXEL_CLOCK_HDMI_54054    (5 << 16)
+#define   AUD_CONFIG_PIXEL_CLOCK_HDMI_74176    (6 << 16)
+#define   AUD_CONFIG_PIXEL_CLOCK_HDMI_74250    (7 << 16)
+#define   AUD_CONFIG_PIXEL_CLOCK_HDMI_148352   (8 << 16)
+#define   AUD_CONFIG_PIXEL_CLOCK_HDMI_148500   (9 << 16)
 #define   AUD_CONFIG_DISABLE_NCTS              (1 << 3)
 
 /* HSW Audio */

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a4d7631..42b1c75 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6723,6 +6723,44 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
        return 0;
 }
 
+static struct {
+       int clock;
+       u32 config;
+} hdmi_audio_clock[] = {
+       { DIV_ROUND_UP(25200 * 1000, 1001), AUD_CONFIG_PIXEL_CLOCK_HDMI_25175 },
+       { 25200, AUD_CONFIG_PIXEL_CLOCK_HDMI_25200 }, /* default per bspec */
+       { 27000, AUD_CONFIG_PIXEL_CLOCK_HDMI_27000 },
+       { 27000 * 1001 / 1000, AUD_CONFIG_PIXEL_CLOCK_HDMI_27027 },
+       { 54000, AUD_CONFIG_PIXEL_CLOCK_HDMI_54000 },
+       { 54000 * 1001 / 1000, AUD_CONFIG_PIXEL_CLOCK_HDMI_54054 },
+       { DIV_ROUND_UP(74250 * 1000, 1001), AUD_CONFIG_PIXEL_CLOCK_HDMI_74176 },
+       { 74250, AUD_CONFIG_PIXEL_CLOCK_HDMI_74250 },
+       { DIV_ROUND_UP(148500 * 1000, 1001), AUD_CONFIG_PIXEL_CLOCK_HDMI_148352 },
+       { 148500, AUD_CONFIG_PIXEL_CLOCK_HDMI_148500 },
+};
+
+/* get AUD_CONFIG_PIXEL_CLOCK_HDMI_* value for mode */
+static u32 audio_config_hdmi_pixel_clock(struct drm_display_mode *mode)
+{
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(hdmi_audio_clock); i++) {
+               if (mode->clock == hdmi_audio_clock[i].clock)
+                       break;
+       }
+
+       if (i == ARRAY_SIZE(hdmi_audio_clock)) {
+               DRM_DEBUG_KMS("HDMI audio pixel clock setting for %d not found, falling back to defaults\n", mode->clock);
+               i = 1;
+       }
+
+       DRM_DEBUG_KMS("Configuring HDMI audio for pixel clock %d (0x%08x)\n",
+                     hdmi_audio_clock[i].clock,
+                     hdmi_audio_clock[i].config);
+
+       return hdmi_audio_clock[i].config;
+}
+
 static bool intel_eld_uptodate(struct drm_connector *connector,
                               int reg_eldv, uint32_t bits_eldv,
                               int reg_elda, uint32_t bits_elda,
@@ -6848,8 +6886,9 @@ static void haswell_write_eld(struct drm_connector *connector,
                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);
+       } else {
+               I915_WRITE(aud_config, audio_config_hdmi_pixel_clock(mode));
+       }
 
        if (intel_eld_uptodate(connector,
                               aud_cntrl_st2, eldv,
@@ -6927,8 +6966,9 @@ static void ironlake_write_eld(struct drm_connector *connector,
                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);
+       } else {
+               I915_WRITE(aud_config, audio_config_hdmi_pixel_clock(mode));
+       }
 
        if (intel_eld_uptodate(connector,
                               aud_cntrl_st2, eldv,