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| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2019-06-19 21:03:07 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2019-07-11 16:25:56 +0300 |
| commit | 5a5efbf4ef504a8136963a8ae10a3c0a1d59b479 (patch) | |
| tree | ce08ae9b46d97f93535a663eaac2b305f79488ab /drivers | |
| parent | aebf052bb6474f21179f2469b5c3172c4f5e4fd1 (diff) | |
| download | linux-5a5efbf4ef504a8136963a8ae10a3c0a1d59b479.tar.bz2 | |
drm/i915/sdvo: Fix handling if zero hbuf size
The spec says:
"A value of 0 indicates that this buffer does not exist"
So we should not convert a hbuf_size of 0 into 1.
Also pull the relevant code into a helper to avoid making the
same mistake multiple times.
And while at it fix the debug prints to not say "hbuf_len" twice.
v2: s/%i/%u/ in the debug (Imre)
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190619180312.31817-1-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_sdvo.c | 32 |
1 files changed, 19 insertions, 13 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_sdvo.c b/drivers/gpu/drm/i915/display/intel_sdvo.c index 3fe8eaef6bd8..213843a93c4e 100644 --- a/drivers/gpu/drm/i915/display/intel_sdvo.c +++ b/drivers/gpu/drm/i915/display/intel_sdvo.c @@ -951,6 +951,20 @@ static bool intel_sdvo_set_audio_state(struct intel_sdvo *intel_sdvo, &audio_state, 1); } +static bool intel_sdvo_get_hbuf_size(struct intel_sdvo *intel_sdvo, + u8 *hbuf_size) +{ + if (!intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_HBUF_INFO, + hbuf_size, 1)) + return false; + + /* Buffer size is 0 based, hooray! However zero means zero. */ + if (*hbuf_size) + (*hbuf_size)++; + + return true; +} + #if 0 static void intel_sdvo_dump_hdmi_buf(struct intel_sdvo *intel_sdvo) { @@ -994,14 +1008,10 @@ static bool intel_sdvo_write_infoframe(struct intel_sdvo *intel_sdvo, set_buf_index, 2)) return false; - if (!intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_HBUF_INFO, - &hbuf_size, 1)) + if (!intel_sdvo_get_hbuf_size(intel_sdvo, &hbuf_size)) return false; - /* Buffer size is 0 based, hooray! */ - hbuf_size++; - - DRM_DEBUG_KMS("writing sdvo hbuf: %i, hbuf_size %i, hbuf_size: %i\n", + DRM_DEBUG_KMS("writing sdvo hbuf: %i, length %u, hbuf_size: %i\n", if_index, length, hbuf_size); if (hbuf_size < length) @@ -1052,14 +1062,10 @@ static ssize_t intel_sdvo_read_infoframe(struct intel_sdvo *intel_sdvo, if (tx_rate == SDVO_HBUF_TX_DISABLED) return 0; - if (!intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_HBUF_INFO, - &hbuf_size, 1)) - return -ENXIO; - - /* Buffer size is 0 based, hooray! */ - hbuf_size++; + if (!intel_sdvo_get_hbuf_size(intel_sdvo, &hbuf_size)) + return false; - DRM_DEBUG_KMS("reading sdvo hbuf: %i, hbuf_size %i, hbuf_size: %i\n", + DRM_DEBUG_KMS("reading sdvo hbuf: %i, length %u, hbuf_size: %i\n", if_index, length, hbuf_size); hbuf_size = min_t(unsigned int, length, hbuf_size); |