[v7 1/5] drm/edid: seek for available CEA and DisplayID block from specific EDID block index
Jani Nikula
jani.nikula at intel.com
Mon Mar 14 08:40:47 UTC 2022
On Sun, 13 Mar 2022, Lee Shawn C <shawn.c.lee at intel.com> wrote:
> drm_find_cea_extension() always look for a top level CEA block. Pass
> ext_index from caller then this function to search next available
> CEA ext block from a specific EDID block pointer.
>
> v2: save proper extension block index if CTA data information
> was found in DispalyID block.
> v3: using different parameters to store CEA and DisplayID block index.
> configure DisplayID extansion block index before search available
> DisplayID block.
>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
> Cc: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
> Cc: Drew Davenport <ddavenport at chromium.org>
> Cc: intel-gfx <intel-gfx at lists.freedesktop.org>
> Signed-off-by: Lee Shawn C <shawn.c.lee at intel.com>
> ---
> drivers/gpu/drm/drm_displayid.c | 10 +++++--
> drivers/gpu/drm/drm_edid.c | 53 ++++++++++++++++++---------------
> include/drm/drm_displayid.h | 4 +--
> 3 files changed, 39 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_displayid.c b/drivers/gpu/drm/drm_displayid.c
> index 32da557b960f..31c3e6d7d549 100644
> --- a/drivers/gpu/drm/drm_displayid.c
> +++ b/drivers/gpu/drm/drm_displayid.c
> @@ -59,11 +59,14 @@ static const u8 *drm_find_displayid_extension(const struct edid *edid,
> }
>
> void displayid_iter_edid_begin(const struct edid *edid,
> - struct displayid_iter *iter)
> + struct displayid_iter *iter, int *ext_index)
Please don't do this. This just ruins the clean approach displayid
iterator added.
Instead of making the displayid iterator ugly, and leaking its
abstractions, I'll repeat what I said should be done in reply to the
very first version of this patch series [1]:
"I think we're going to need abstracted EDID iteration similar to what
I've done for DisplayID iteration. We can't have all places
reimplementing the iteration like we have now."
This isn't a problem that should be solved by having all the callers
hold a bunch of local variables and pass them around to all the
functions. Nobody's going to be able to keep track of this anymore. And
this series, as it is, makes it harder to fix this properly later on.
BR,
Jani.
[1] https://lore.kernel.org/r/87czjf8dik.fsf@intel.com
> {
> memset(iter, 0, sizeof(*iter));
>
> iter->edid = edid;
> +
> + if (ext_index)
> + iter->ext_index = *ext_index;
> }
>
> static const struct displayid_block *
> @@ -126,7 +129,10 @@ __displayid_iter_next(struct displayid_iter *iter)
> }
> }
>
> -void displayid_iter_end(struct displayid_iter *iter)
> +void displayid_iter_end(struct displayid_iter *iter, int *ext_index)
> {
> + if (ext_index)
> + *ext_index = iter->ext_index;
> +
> memset(iter, 0, sizeof(*iter));
> }
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 561f53831e29..78c415aa6889 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -3353,28 +3353,27 @@ const u8 *drm_find_edid_extension(const struct edid *edid,
> return edid_ext;
> }
>
> -static const u8 *drm_find_cea_extension(const struct edid *edid)
> +static const u8 *drm_find_cea_extension(const struct edid *edid,
> + int *cea_ext_index, int *displayid_ext_index)
> {
> const struct displayid_block *block;
> struct displayid_iter iter;
> const u8 *cea;
> - int ext_index = 0;
>
> - /* Look for a top level CEA extension block */
> - /* FIXME: make callers iterate through multiple CEA ext blocks? */
> - cea = drm_find_edid_extension(edid, CEA_EXT, &ext_index);
> + /* Look for a CEA extension block from ext_index */
> + cea = drm_find_edid_extension(edid, CEA_EXT, cea_ext_index);
> if (cea)
> return cea;
>
> /* CEA blocks can also be found embedded in a DisplayID block */
> - displayid_iter_edid_begin(edid, &iter);
> + displayid_iter_edid_begin(edid, &iter, displayid_ext_index);
> displayid_iter_for_each(block, &iter) {
> if (block->tag == DATA_BLOCK_CTA) {
> cea = (const u8 *)block;
> break;
> }
> }
> - displayid_iter_end(&iter);
> + displayid_iter_end(&iter, displayid_ext_index);
>
> return cea;
> }
> @@ -3643,10 +3642,10 @@ add_alternate_cea_modes(struct drm_connector *connector, struct edid *edid)
> struct drm_device *dev = connector->dev;
> struct drm_display_mode *mode, *tmp;
> LIST_HEAD(list);
> - int modes = 0;
> + int modes = 0, cea_ext_index = 0, displayid_ext_index = 0;
>
> /* Don't add CEA modes if the CEA extension block is missing */
> - if (!drm_find_cea_extension(edid))
> + if (!drm_find_cea_extension(edid, &cea_ext_index, &displayid_ext_index))
> return 0;
>
> /*
> @@ -4321,11 +4320,11 @@ static void drm_parse_y420cmdb_bitmap(struct drm_connector *connector,
> static int
> add_cea_modes(struct drm_connector *connector, struct edid *edid)
> {
> - const u8 *cea = drm_find_cea_extension(edid);
> - const u8 *db, *hdmi = NULL, *video = NULL;
> + const u8 *cea, *db, *hdmi = NULL, *video = NULL;
> u8 dbl, hdmi_len, video_len = 0;
> - int modes = 0;
> + int modes = 0, cea_ext_index = 0, displayid_ext_index = 0;
>
> + cea = drm_find_cea_extension(edid, &cea_ext_index, &displayid_ext_index);
> if (cea && cea_revision(cea) >= 3) {
> int i, start, end;
>
> @@ -4563,6 +4562,7 @@ static void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
> const u8 *cea;
> const u8 *db;
> int total_sad_count = 0;
> + int cea_ext_index = 0, displayid_ext_index = 0;
> int mnl;
> int dbl;
>
> @@ -4571,7 +4571,7 @@ static void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
> if (!edid)
> return;
>
> - cea = drm_find_cea_extension(edid);
> + cea = drm_find_cea_extension(edid, &cea_ext_index, &displayid_ext_index);
> if (!cea) {
> DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
> return;
> @@ -4657,9 +4657,10 @@ int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads)
> {
> int count = 0;
> int i, start, end, dbl;
> + int cea_ext_index = 0, displayid_ext_index = 0;
> const u8 *cea;
>
> - cea = drm_find_cea_extension(edid);
> + cea = drm_find_cea_extension(edid, &cea_ext_index, &displayid_ext_index);
> if (!cea) {
> DRM_DEBUG_KMS("SAD: no CEA Extension found\n");
> return 0;
> @@ -4719,9 +4720,10 @@ int drm_edid_to_speaker_allocation(struct edid *edid, u8 **sadb)
> {
> int count = 0;
> int i, start, end, dbl;
> + int cea_ext_index = 0, displayid_ext_index = 0;
> const u8 *cea;
>
> - cea = drm_find_cea_extension(edid);
> + cea = drm_find_cea_extension(edid, &cea_ext_index, &displayid_ext_index);
> if (!cea) {
> DRM_DEBUG_KMS("SAD: no CEA Extension found\n");
> return 0;
> @@ -4815,8 +4817,9 @@ bool drm_detect_hdmi_monitor(struct edid *edid)
> const u8 *edid_ext;
> int i;
> int start_offset, end_offset;
> + int cea_ext_index = 0, displayid_ext_index = 0;
>
> - edid_ext = drm_find_cea_extension(edid);
> + edid_ext = drm_find_cea_extension(edid, &cea_ext_index, &displayid_ext_index);
> if (!edid_ext)
> return false;
>
> @@ -4854,8 +4857,9 @@ bool drm_detect_monitor_audio(struct edid *edid)
> int i, j;
> bool has_audio = false;
> int start_offset, end_offset;
> + int cea_ext_index = 0, displayid_ext_index = 0;
>
> - edid_ext = drm_find_cea_extension(edid);
> + edid_ext = drm_find_cea_extension(edid, &cea_ext_index, &displayid_ext_index);
> if (!edid_ext)
> goto end;
>
> @@ -5178,8 +5182,9 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
> struct drm_display_info *info = &connector->display_info;
> const u8 *edid_ext;
> int i, start, end;
> + int cea_ext_index = 0, displayid_ext_index = 0;
>
> - edid_ext = drm_find_cea_extension(edid);
> + edid_ext = drm_find_cea_extension(edid, &cea_ext_index, &displayid_ext_index);
> if (!edid_ext)
> return;
>
> @@ -5311,12 +5316,12 @@ static void drm_update_mso(struct drm_connector *connector, const struct edid *e
> const struct displayid_block *block;
> struct displayid_iter iter;
>
> - displayid_iter_edid_begin(edid, &iter);
> + displayid_iter_edid_begin(edid, &iter, NULL);
> displayid_iter_for_each(block, &iter) {
> if (block->tag == DATA_BLOCK_2_VENDOR_SPECIFIC)
> drm_parse_vesa_mso_data(connector, block);
> }
> - displayid_iter_end(&iter);
> + displayid_iter_end(&iter, NULL);
> }
>
> /* A connector has no EDID information, so we've got no EDID to compute quirks from. Reset
> @@ -5516,13 +5521,13 @@ static int add_displayid_detailed_modes(struct drm_connector *connector,
> struct displayid_iter iter;
> int num_modes = 0;
>
> - displayid_iter_edid_begin(edid, &iter);
> + displayid_iter_edid_begin(edid, &iter, NULL);
> displayid_iter_for_each(block, &iter) {
> if (block->tag == DATA_BLOCK_TYPE_1_DETAILED_TIMING ||
> block->tag == DATA_BLOCK_2_TYPE_7_DETAILED_TIMING)
> num_modes += add_displayid_detailed_1_modes(connector, block);
> }
> - displayid_iter_end(&iter);
> + displayid_iter_end(&iter, NULL);
>
> return num_modes;
> }
> @@ -6164,12 +6169,12 @@ void drm_update_tile_info(struct drm_connector *connector,
>
> connector->has_tile = false;
>
> - displayid_iter_edid_begin(edid, &iter);
> + displayid_iter_edid_begin(edid, &iter, NULL);
> displayid_iter_for_each(block, &iter) {
> if (block->tag == DATA_BLOCK_TILED_DISPLAY)
> drm_parse_tiled_block(connector, block);
> }
> - displayid_iter_end(&iter);
> + displayid_iter_end(&iter, NULL);
>
> if (!connector->has_tile && connector->tile_group) {
> drm_mode_put_tile_group(connector->dev, connector->tile_group);
> diff --git a/include/drm/drm_displayid.h b/include/drm/drm_displayid.h
> index 7ffbd9f7bfc7..15442a161c11 100644
> --- a/include/drm/drm_displayid.h
> +++ b/include/drm/drm_displayid.h
> @@ -150,11 +150,11 @@ struct displayid_iter {
> };
>
> void displayid_iter_edid_begin(const struct edid *edid,
> - struct displayid_iter *iter);
> + struct displayid_iter *iter, int *ext_index);
> const struct displayid_block *
> __displayid_iter_next(struct displayid_iter *iter);
> #define displayid_iter_for_each(__block, __iter) \
> while (((__block) = __displayid_iter_next(__iter)))
> -void displayid_iter_end(struct displayid_iter *iter);
> +void displayid_iter_end(struct displayid_iter *iter, int *ext_index);
>
> #endif
--
Jani Nikula, Intel Open Source Graphics Center
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