drm/edid: fix Baseline_ELD_Len field in drm_edid_to_eld()

The Baseline_ELD_Len field does not include ELD Header Block size.

From High Definition Audio Specification, Revision 1.0a:

	The header block is a fixed size of 4 bytes. The baseline block
	is variable size in multiple of 4 bytes, and its size is defined
	in the header block Baseline_ELD_Len field (in number of
	DWords).

Do not include the header size in Baseline_ELD_Len field. Fix all known
users of eld[2].

While at it, switch to DIV_ROUND_UP instead of open coding it.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Dave Airlie <airlied@linux.ie>
[danvet: Fix compile fail in nouveau.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 8 insertions, 8 deletions

diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
index 44c49dfe1096..87750ef018e6 100644
--- a/drivers/gpu/drm/i915/intel_audio.c
+++ b/drivers/gpu/drm/i915/intel_audio.c
@@ -107,7 +107,7 @@ static bool intel_eld_uptodate(struct drm_connector *connector,
         tmp &= ~bits_elda;
         I915_WRITE(reg_elda, tmp);
 
-        for (i = 0; i < eld[2]; i++)
+        for (i = 0; i < drm_eld_size(eld) / 4; i++)
                 if (I915_READ(reg_edid) != *((uint32_t *)eld + i))
                         return false;
 
@@ -162,7 +162,7 @@ static void g4x_audio_codec_enable(struct drm_connector *connector,
         len = (tmp >> 9) & 0x1f;                /* ELD buffer size */
         I915_WRITE(G4X_AUD_CNTL_ST, tmp);
 
-        len = min_t(int, eld[2], len);
+        len = min(drm_eld_size(eld) / 4, len);
         DRM_DEBUG_DRIVER("ELD size %d\n", len);
         for (i = 0; i < len; i++)
                 I915_WRITE(G4X_HDMIW_HDMIEDID, *((uint32_t *)eld + i));
@@ -209,7 +209,7 @@ static void hsw_audio_codec_enable(struct drm_connector *connector,
         int len, i;
 
         DRM_DEBUG_KMS("Enable audio codec on pipe %c, %u bytes ELD\n",
-                      pipe_name(pipe), eld[2]);
+                      pipe_name(pipe), drm_eld_size(eld));
 
         /* Enable audio presence detect, invalidate ELD */
         tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
@@ -230,8 +230,8 @@ static void hsw_audio_codec_enable(struct drm_connector *connector,
         I915_WRITE(HSW_AUD_DIP_ELD_CTRL(pipe), tmp);
 
         /* Up to 84 bytes of hw ELD buffer */
-        len = min_t(int, eld[2], 21);
-        for (i = 0; i < len; i++)
+        len = min(drm_eld_size(eld), 84);
+        for (i = 0; i < len / 4; i++)
                 I915_WRITE(HSW_AUD_EDID_DATA(pipe), *((uint32_t *)eld + i));
 
         /* ELD valid */
@@ -320,7 +320,7 @@ static void ilk_audio_codec_enable(struct drm_connector *connector,
         int aud_cntrl_st2;
 
         DRM_DEBUG_KMS("Enable audio codec on port %c, pipe %c, %u bytes ELD\n",
-                      port_name(port), pipe_name(pipe), eld[2]);
+                      port_name(port), pipe_name(pipe), drm_eld_size(eld));
 
         /*
          * FIXME: We're supposed to wait for vblank here, but we have vblanks
@@ -364,8 +364,8 @@ static void ilk_audio_codec_enable(struct drm_connector *connector,
         I915_WRITE(aud_cntl_st, tmp);
 
         /* Up to 84 bytes of hw ELD buffer */
-        len = min_t(int, eld[2], 21);
-        for (i = 0; i < len; i++)
+        len = min(drm_eld_size(eld), 84);
+        for (i = 0; i < len / 4; i++)
                 I915_WRITE(hdmiw_hdmiedid, *((uint32_t *)eld + i));
 
         /* ELD valid */