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drm/i915/dsi: skip unknown elements for sequence block v3+ 

The sequence block has sizes of elements after the operation byte since
sequence block v3. Use it to skip elements we don't support yet.

v2: remove redundant exec_elem[operation_byte] check (Daniel)

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1452006408-27688-1-git-send-email-jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2016-01-05 17:06:48 +02:00
parent 2a33d93486
commit 4079578279
1 changed files with 23 additions and 19 deletions
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42
drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
View File

@ -283,31 +283,35 @@ static void generic_exec_sequence(struct intel_dsi *intel_dsi, const u8 *data)
if (dev_priv->vbt.dsi.seq_version >= 3)
data += 4;
/* parse each byte till we reach end of sequence byte - 0x00 */
while (1) {
u8 operation_byte = *data++;
if (operation_byte >= ARRAY_SIZE(exec_elem) ||
!exec_elem[operation_byte]) {
u8 operation_size = 0;
if (operation_byte == MIPI_SEQ_ELEM_END)
break;
if (operation_byte < ARRAY_SIZE(exec_elem))
mipi_elem_exec = exec_elem[operation_byte];
else
mipi_elem_exec = NULL;
/* Size of Operation. */
if (dev_priv->vbt.dsi.seq_version >= 3)
operation_size = *data++;
if (mipi_elem_exec) {
data = mipi_elem_exec(intel_dsi, data);
} else if (operation_size) {
/* We have size, skip. */
DRM_DEBUG_KMS("Unsupported MIPI operation byte %u\n",
operation_byte);
data += operation_size;
} else {
/* No size, can't skip without parsing. */
DRM_ERROR("Unsupported MIPI operation byte %u\n",
operation_byte);
return;
}
mipi_elem_exec = exec_elem[operation_byte];
/* Skip Size of Operation. */
if (dev_priv->vbt.dsi.seq_version >= 3)
data++;
/* execute the element specific rotines */
data = mipi_elem_exec(intel_dsi, data);
/*
* After processing the element, data should point to
* next element or end of sequence
* check if have we reached end of sequence
*/
if (*data == 0x00)
break;
}
}