From patchwork Mon Jan 11 13:15:02 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jani Nikula X-Patchwork-Id: 8003171 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 24AF5BEEE5 for ; Mon, 11 Jan 2016 13:15:26 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2542D202D1 for ; Mon, 11 Jan 2016 13:15:25 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id B7480202B8 for ; Mon, 11 Jan 2016 13:15:23 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 601A66E4CD; Mon, 11 Jan 2016 05:15:22 -0800 (PST) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTP id AAC926E4CD for ; Mon, 11 Jan 2016 05:15:13 -0800 (PST) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP; 11 Jan 2016 05:15:06 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,552,1444719600"; d="scan'208";a="890793855" Received: from jnikula-mobl.fi.intel.com (HELO localhost) ([10.237.72.67]) by fmsmga002.fm.intel.com with ESMTP; 11 Jan 2016 05:15:03 -0800 From: Jani Nikula To: Jani Nikula , intel-gfx@lists.freedesktop.org Date: Mon, 11 Jan 2016 15:15:02 +0200 Message-Id: <1452518102-3154-1-git-send-email-jani.nikula@intel.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1452006075-19826-1-git-send-email-jani.nikula@intel.com> References: <1452006075-19826-1-git-send-email-jani.nikula@intel.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo Cc: Deepak M Subject: [Intel-gfx] [PATCH v3] drm/i915/bios: add support for MIPI sequence block v3 X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The changes since the sequence block v2 are: * The whole MIPI bios data block has a separate 32-bit size field since v3, stored after the version. This facilitates big sequences. * The size of the panel specific sequence blocks has grown to 32 bits. This facilitates big sequences. * The elements within sequences now have an 8-bit size field following the operation byte. This facilitates skipping unknown new operation bytes, i.e. forward compatibility. v2 (of the patch): use DRM_ERROR for unknown operation byte v3 (of the patch): even more bounds checking (Ville) Signed-off-by: Jani Nikula Reviewed-by: Ville Syrjälä --- drivers/gpu/drm/i915/intel_bios.c | 96 ++++++++++++++++++++++++++---- drivers/gpu/drm/i915/intel_dsi_panel_vbt.c | 9 +++ 2 files changed, 94 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index 69040a73c09a..15ba52bd2538 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -754,21 +754,33 @@ parse_mipi_config(struct drm_i915_private *dev_priv, /* Find the sequence block and size for the given panel. */ static const u8 * find_panel_sequence_block(const struct bdb_mipi_sequence *sequence, - u16 panel_id, u16 *seq_size) + u16 panel_id, u32 *seq_size) { u32 total = get_blocksize(sequence); const u8 *data = &sequence->data[0]; u8 current_id; - u16 current_size; + u32 current_size; + int header_size = sequence->version >= 3 ? 5 : 3; int index = 0; int i; - for (i = 0; i < MAX_MIPI_CONFIGURATIONS && index + 3 < total; i++) { + /* skip new block size */ + if (sequence->version >= 3) + data += 4; + + for (i = 0; i < MAX_MIPI_CONFIGURATIONS && index < total; i++) { + if (index + header_size > total) { + DRM_ERROR("Invalid sequence block (header)\n"); + return NULL; + } + current_id = *(data + index); - index++; + if (sequence->version >= 3) + current_size = *((const u32 *)(data + index + 1)); + else + current_size = *((const u16 *)(data + index + 1)); - current_size = *((const u16 *)(data + index)); - index += 2; + index += header_size; if (index + current_size > total) { DRM_ERROR("Invalid sequence block\n"); @@ -826,13 +838,71 @@ static int goto_next_sequence(const u8 *data, int index, int total) return 0; } +static int goto_next_sequence_v3(const u8 *data, int index, int total) +{ + int seq_end; + u16 len; + + /* + * Could skip sequence based on Size of Sequence alone, but also do some + * checking on the structure. + */ + if (total < 5) { + DRM_ERROR("Too small sequence size\n"); + return 0; + } + + seq_end = index + *((const u32 *)(data + 1)); + if (seq_end > total) { + DRM_ERROR("Invalid sequence size\n"); + return 0; + } + + /* Skip Sequence Byte and Size of Sequence. */ + for (index = index + 5; index < total; index += len) { + u8 operation_byte = *(data + index); + index++; + + if (operation_byte == MIPI_SEQ_ELEM_END) { + if (index != seq_end) { + DRM_ERROR("Invalid element structure\n"); + return 0; + } + return index; + } + + len = *(data + index); + index++; + + /* + * FIXME: Would be nice to check elements like for v1/v2 in + * goto_next_sequence() above. + */ + switch (operation_byte) { + case MIPI_SEQ_ELEM_SEND_PKT: + case MIPI_SEQ_ELEM_DELAY: + case MIPI_SEQ_ELEM_GPIO: + case MIPI_SEQ_ELEM_I2C: + case MIPI_SEQ_ELEM_SPI: + case MIPI_SEQ_ELEM_PMIC: + break; + default: + DRM_ERROR("Unknown operation byte %u\n", + operation_byte); + break; + } + } + + return 0; +} + static void parse_mipi_sequence(struct drm_i915_private *dev_priv, const struct bdb_header *bdb) { const struct bdb_mipi_sequence *sequence; const u8 *seq_data; - u16 seq_size; + u32 seq_size; u8 *data; int index = 0; @@ -847,12 +917,13 @@ parse_mipi_sequence(struct drm_i915_private *dev_priv, } /* Fail gracefully for forward incompatible sequence block. */ - if (sequence->version >= 3) { - DRM_ERROR("Unable to parse MIPI Sequence Block v3+\n"); + if (sequence->version >= 4) { + DRM_ERROR("Unable to parse MIPI Sequence Block v%u\n", + sequence->version); return; } - DRM_DEBUG_DRIVER("Found MIPI sequence block\n"); + DRM_DEBUG_DRIVER("Found MIPI sequence block v%u\n", sequence->version); seq_data = find_panel_sequence_block(sequence, panel_type, &seq_size); if (!seq_data) @@ -875,7 +946,10 @@ parse_mipi_sequence(struct drm_i915_private *dev_priv, dev_priv->vbt.dsi.sequence[seq_id] = data + index; - index = goto_next_sequence(data, index, seq_size); + if (sequence->version >= 3) + index = goto_next_sequence_v3(data, index, seq_size); + else + index = goto_next_sequence(data, index, seq_size); if (!index) { DRM_ERROR("Invalid sequence %u\n", seq_id); goto err; diff --git a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c index 5303d1c446d5..7f67749eb0ef 100644 --- a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c +++ b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c @@ -319,6 +319,7 @@ static const char *sequence_name(enum mipi_seq seq_id) static void generic_exec_sequence(struct intel_dsi *intel_dsi, const u8 *data) { + struct drm_i915_private *dev_priv = to_i915(intel_dsi->base.base.dev); fn_mipi_elem_exec mipi_elem_exec; if (!data) @@ -330,6 +331,10 @@ static void generic_exec_sequence(struct intel_dsi *intel_dsi, const u8 *data) /* go to the first element of the sequence */ data++; + /* Skip Size of Sequence. */ + 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++; @@ -341,6 +346,10 @@ static void generic_exec_sequence(struct intel_dsi *intel_dsi, const u8 *data) } 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);