Re: [MIPI SEQ PARSING v1 PATCH 3/9] drm/i915: Using the approprite vbt size if vbt is not in mailbox4 of opregion

Jani Nikula
2015-07-28T15:21:07Z

On Tue, 28 Jul 2015, Deepak M <m.deepak@intel.com> wrote:
> Currently the field in bdb header which indicates the VBT size
> is of 2 bytes, but there are some cases where VBT size exceeds
> 64KB in which case this field may not contain the correct VBT size.
> So its better to get the VBT size from the mailbox3 if
> VBT is not present in the mailbox4 of opregion.
>
> Signed-off-by: Deepak M <m.deepak@intel.com>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 5 ++++
> drivers/gpu/drm/i915/intel_bios.c | 43 +++++++++++++++++++--------------
> drivers/gpu/drm/i915/intel_opregion.c | 7 ++++--
> 3 files changed, 35 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 1dbd957..b38f52ee 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1740,6 +1740,11 @@ struct drm_i915_private {
> u32 pm_rps_events;
> u32 pipestat_irq_mask[I915_MAX_PIPES];
>
> + bool vbt_in_mailbox4;
> +
> + /* value is true when VBT is present in mailbox4 */
> + u32 vbt_size;
> +

There's already struct intel_opregion opregion field in dev_priv where
this belongs instead of cluttering the top level.

You should only add vbt size in the struct, and make sure it's valid for
all scenarios, mailbox 4 or not, and always check against that. Having
size fields with separate validity fields will drive people insane.

> struct i915_hotplug hotplug;
> struct i915_fbc fbc;
> struct i915_drrs drrs;
> diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
> index 1b9164e..5e0ff22 100644
> --- a/drivers/gpu/drm/i915/intel_bios.c
> +++ b/drivers/gpu/drm/i915/intel_bios.c
> @@ -37,17 +37,22 @@
> static int panel_type;
>
> static const void *
> -find_section(const void *_bdb, int section_id)
> +find_section(struct drm_i915_private *dev_priv,
> + const void *_bdb, int section_id)
> {
> const struct bdb_header *bdb = _bdb;
> const u8 *base = _bdb;
> int index = 0;
> - u16 total, current_size;
> + u32 total, current_size;
> u8 current_id;
>
> /* skip to first section */
> index += bdb->header_size;
> - total = bdb->bdb_size;
> +
> + if (dev_priv->vbt_in_mailbox4)
> + total = bdb->bdb_size;
> + else
> + total = dev_priv->vbt_size;
>
> /* walk the sections looking for section_id */
> while (index + 3 < total) {
> @@ -179,7 +184,7 @@ parse_lfp_panel_data(struct drm_i915_private *dev_priv,
> struct drm_display_mode *panel_fixed_mode;
> int drrs_mode;
>
> - lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
> + lvds_options = find_section(dev_priv, bdb, BDB_LVDS_OPTIONS);
> if (!lvds_options)
> return;
>
> @@ -211,11 +216,12 @@ parse_lfp_panel_data(struct drm_i915_private *dev_priv,
> break;
> }
>
> - lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
> + lvds_lfp_data = find_section(dev_priv, bdb, BDB_LVDS_LFP_DATA);
> if (!lvds_lfp_data)
> return;
>
> - lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
> + lvds_lfp_data_ptrs = find_section(dev_priv, bdb,
> + BDB_LVDS_LFP_DATA_PTRS);
> if (!lvds_lfp_data_ptrs)
> return;
>
> @@ -257,7 +263,7 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv,
> const struct bdb_lfp_backlight_data *backlight_data;
> const struct bdb_lfp_backlight_data_entry *entry;
>
> - backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
> + backlight_data = find_section(dev_priv, bdb, BDB_LVDS_BACKLIGHT);
> if (!backlight_data)
> return;
>
> @@ -305,14 +311,15 @@ parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
> if (index == -1) {
> const struct bdb_sdvo_lvds_options *sdvo_lvds_options;
>
> - sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
> + sdvo_lvds_options = find_section(dev_priv, bdb,
> + BDB_SDVO_LVDS_OPTIONS);
> if (!sdvo_lvds_options)
> return;
>
> index = sdvo_lvds_options->panel_type;
> }
>
> - dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
> + dvo_timing = find_section(dev_priv, bdb, BDB_SDVO_PANEL_DTDS);
> if (!dvo_timing)
> return;
>
> @@ -349,7 +356,7 @@ parse_general_features(struct drm_i915_private *dev_priv,
> struct drm_device *dev = dev_priv->dev;
> const struct bdb_general_features *general;
>
> - general = find_section(bdb, BDB_GENERAL_FEATURES);
> + general = find_section(dev_priv, bdb, BDB_GENERAL_FEATURES);
> if (general) {
> dev_priv->vbt.int_tv_support = general->int_tv_support;
> dev_priv->vbt.int_crt_support = general->int_crt_support;
> @@ -374,7 +381,7 @@ parse_general_definitions(struct drm_i915_private *dev_priv,
> {
> const struct bdb_general_definitions *general;
>
> - general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
> + general = find_section(dev_priv, bdb, BDB_GENERAL_DEFINITIONS);
> if (general) {
> u16 block_size = get_blocksize(general);
> if (block_size >= sizeof(*general)) {
> @@ -405,7 +412,7 @@ parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
> int i, child_device_num, count;
> u16 block_size;
>
> - p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
> + p_defs = find_section(dev_priv, bdb, BDB_GENERAL_DEFINITIONS);
> if (!p_defs) {
> DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
> return;
> @@ -491,7 +498,7 @@ parse_driver_features(struct drm_i915_private *dev_priv,
> {
> const struct bdb_driver_features *driver;
>
> - driver = find_section(bdb, BDB_DRIVER_FEATURES);
> + driver = find_section(dev_priv, bdb, BDB_DRIVER_FEATURES);
> if (!driver)
> return;
>
> @@ -519,7 +526,7 @@ parse_edp(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
> const struct edp_power_seq *edp_pps;
> const struct edp_link_params *edp_link_params;
>
> - edp = find_section(bdb, BDB_EDP);
> + edp = find_section(dev_priv, bdb, BDB_EDP);
> if (!edp) {
> if (dev_priv->vbt.edp_support)
> DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
> @@ -630,7 +637,7 @@ parse_psr(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
> const struct bdb_psr *psr;
> const struct psr_table *psr_table;
>
> - psr = find_section(bdb, BDB_PSR);
> + psr = find_section(dev_priv, bdb, BDB_PSR);
> if (!psr) {
> DRM_DEBUG_KMS("No PSR BDB found.\n");
> return;
> @@ -768,7 +775,7 @@ parse_mipi(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
> /* Parse #52 for panel index used from panel_type already
> * parsed
> */
> - start = find_section(bdb, BDB_MIPI_CONFIG);
> + start = find_section(dev_priv, bdb, BDB_MIPI_CONFIG);
> if (!start) {
> DRM_DEBUG_KMS("No MIPI config BDB found");
> return;
> @@ -799,7 +806,7 @@ parse_mipi(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
> dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
>
> /* Check if we have sequence block as well */
> - sequence = find_section(bdb, BDB_MIPI_SEQUENCE);
> + sequence = find_section(dev_priv, bdb, BDB_MIPI_SEQUENCE);
> if (!sequence) {
> DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n");
> return;
> @@ -1023,7 +1030,7 @@ parse_device_mapping(struct drm_i915_private *dev_priv,
> int i, child_device_num, count;
> u16 block_size;
>
> - p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
> + p_defs = find_section(dev_priv, bdb, BDB_GENERAL_DEFINITIONS);
> if (!p_defs) {
> DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
> return;
> diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
> index 1372e39..1f76715 100644
> --- a/drivers/gpu/drm/i915/intel_opregion.c
> +++ b/drivers/gpu/drm/i915/intel_opregion.c
> @@ -896,11 +896,14 @@ int intel_opregion_setup(struct drm_device *dev)
> opregion->header = base;
> opregion->asle = base + OPREGION_ASLE_OFFSET;
>
> + dev_priv->vbt_in_mailbox4 = true;
> if (opregion->header->opregion_ver >= 2) {
> - if (opregion->asle->rvda)
> + if (opregion->asle->rvda) {
> vbt_base = acpi_os_ioremap(opregion->asle->rvda,
> opregion->asle->rvds);
> - else
> + dev_priv->vbt_in_mailbox4 = false;
> + dev_priv->vbt_size = opregion->asle->rvds;
> + } else
> vbt_base = acpi_os_ioremap(asls + OPREGION_VBT_OFFSET,
> OPREGION_SIZE - OPREGION_VBT_OFFSET);
> } else
> --
> 1.7.9.5
>
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--
Jani Nikula, Intel Open Source Technology Center