[PATCH v4] mode: Retrieve only the current information for a Connector
Daniel Vetter
daniel at ffwll.ch
Wed Mar 4 10:00:25 PST 2015
On Wed, Mar 04, 2015 at 01:16:20PM +0000, Chris Wilson wrote:
> Add a new API that allows the caller to skip any forced probing, which
> may require slow i2c to a remote display, and only report the currently
> active mode and encoder for a Connector. This is often the information
> of interest and is much, much faster than re-retrieving the link status
> and EDIDs, e.g. if the caller only wishes to count the number of active
> outputs.
>
> v2: Fix error path to avoid double free after a failed GETCONNECTOR
> ioctl.
>
> v3: Daniel strongly disapproved of my disjoint in behaviour between
> GetConnector and GetConnectorCurrent, and considering how best to make a
> drop in replacement for drmmode_output_init() convinced me keeping the
> API as consistent as possible was the right approach.
>
> v4: Avoid probing on the second calls to GETCONNECTOR for unconnected
> outputs.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Daniel Vetter <daniel.vetter at ffwll.com>
> Cc: Damien Lespiau <damien.lespiau at intel.com>
> Cc: David Herrmann <dh.herrmann at googlemail.com>
Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
> tests/modeprint/modeprint.c | 18 ++++++++++++++++--
> xf86drmMode.c | 23 ++++++++++++++++++++---
> xf86drmMode.h | 17 +++++++++++++++--
> 3 files changed, 51 insertions(+), 7 deletions(-)
>
> diff --git a/tests/modeprint/modeprint.c b/tests/modeprint/modeprint.c
> index 6f0d039..514d3ba 100644
> --- a/tests/modeprint/modeprint.c
> +++ b/tests/modeprint/modeprint.c
> @@ -43,6 +43,7 @@
>
> #define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
>
> +int current;
> int connectors;
> int full_props;
> int edid;
> @@ -272,7 +273,7 @@ int printRes(int fd, drmModeResPtr res)
>
> if (connectors) {
> for (i = 0; i < res->count_connectors; i++) {
> - connector = drmModeGetConnector(fd, res->connectors[i]);
> + connector = (current ? drmModeGetConnectorCurrent : drmModeGetConnector) (fd, res->connectors[i]);
>
> if (!connector)
> printf("Could not get connector %i\n", res->connectors[i]);
> @@ -331,6 +332,7 @@ int printRes(int fd, drmModeResPtr res)
>
> void args(int argc, char **argv)
> {
> + int defaults = 1;
> int i;
>
> fbs = 0;
> @@ -341,32 +343,41 @@ void args(int argc, char **argv)
> full_modes = 0;
> full_props = 0;
> connectors = 0;
> + current = 0;
>
> module_name = argv[1];
>
> for (i = 2; i < argc; i++) {
> if (strcmp(argv[i], "-fb") == 0) {
> fbs = 1;
> + defaults = 0;
> } else if (strcmp(argv[i], "-crtcs") == 0) {
> crtcs = 1;
> + defaults = 0;
> } else if (strcmp(argv[i], "-cons") == 0) {
> connectors = 1;
> modes = 1;
> + defaults = 0;
> } else if (strcmp(argv[i], "-modes") == 0) {
> connectors = 1;
> modes = 1;
> + defaults = 0;
> } else if (strcmp(argv[i], "-full") == 0) {
> connectors = 1;
> modes = 1;
> full_modes = 1;
> + defaults = 0;
> } else if (strcmp(argv[i], "-props") == 0) {
> connectors = 1;
> full_props = 1;
> + defaults = 0;
> } else if (strcmp(argv[i], "-edids") == 0) {
> connectors = 1;
> edid = 1;
> + defaults = 0;
> } else if (strcmp(argv[i], "-encoders") == 0) {
> encoders = 1;
> + defaults = 0;
> } else if (strcmp(argv[i], "-v") == 0) {
> fbs = 1;
> edid = 1;
> @@ -376,10 +387,13 @@ void args(int argc, char **argv)
> full_modes = 1;
> full_props = 1;
> connectors = 1;
> + defaults = 0;
> + } else if (strcmp(argv[i], "-current") == 0) {
> + current = 1;
> }
> }
>
> - if (argc == 2) {
> + if (defaults) {
> fbs = 1;
> edid = 1;
> crtcs = 1;
> diff --git a/xf86drmMode.c b/xf86drmMode.c
> index 9ea8fe7..57d1dc9 100644
> --- a/xf86drmMode.c
> +++ b/xf86drmMode.c
> @@ -476,19 +476,23 @@ drmModeEncoderPtr drmModeGetEncoder(int fd, uint32_t encoder_id)
> /*
> * Connector manipulation
> */
> -
> -drmModeConnectorPtr drmModeGetConnector(int fd, uint32_t connector_id)
> +static drmModeConnectorPtr
> +_drmModeGetConnector(int fd, uint32_t connector_id, int probe)
> {
> struct drm_mode_get_connector conn, counts;
> drmModeConnectorPtr r = NULL;
>
> -retry:
> memclear(conn);
> conn.connector_id = connector_id;
> + if (!probe) {
> + conn.count_modes = 1;
> + conn.modes_ptr = VOID2U64(drmMalloc(sizeof(struct drm_mode_modeinfo)));
> + }
>
> if (drmIoctl(fd, DRM_IOCTL_MODE_GETCONNECTOR, &conn))
> return 0;
>
> +retry:
> counts = conn;
>
> if (conn.count_props) {
> @@ -504,6 +508,9 @@ retry:
> conn.modes_ptr = VOID2U64(drmMalloc(conn.count_modes*sizeof(struct drm_mode_modeinfo)));
> if (!conn.modes_ptr)
> goto err_allocs;
> + } else {
> + conn.count_modes = 1;
> + conn.modes_ptr = VOID2U64(drmMalloc(sizeof(struct drm_mode_modeinfo)));
> }
>
> if (conn.count_encoders) {
> @@ -572,6 +579,16 @@ err_allocs:
> return r;
> }
>
> +drmModeConnectorPtr drmModeGetConnector(int fd, uint32_t connector_id)
> +{
> + return _drmModeGetConnector(fd, connector_id, 1);
> +}
> +
> +drmModeConnectorPtr drmModeGetConnectorCurrent(int fd, uint32_t connector_id)
> +{
> + return _drmModeGetConnector(fd, connector_id, 0);
> +}
> +
> int drmModeAttachMode(int fd, uint32_t connector_id, drmModeModeInfoPtr mode_info)
> {
> struct drm_mode_mode_cmd res;
> diff --git a/xf86drmMode.h b/xf86drmMode.h
> index 856a6bb..278da48 100644
> --- a/xf86drmMode.h
> +++ b/xf86drmMode.h
> @@ -422,10 +422,23 @@ drmModeEncoderPtr drmModeGetEncoder(int fd, uint32_t encoder_id);
> */
>
> /**
> - * Retrive information about the connector connectorId.
> + * Retrieve all information about the connector connectorId. This will do a
> + * forced probe on the connector to retrieve remote information such as EDIDs
> + * from the display device.
> */
> extern drmModeConnectorPtr drmModeGetConnector(int fd,
> - uint32_t connectorId);
> + uint32_t connectorId);
> +
> +/**
> + * Retrieve current information, i.e the currently active mode and encoder,
> + * about the connector connectorId. This will not do any probing on the
> + * connector or remote device, and only reports what is currently known.
> + * For the complete set of modes and encoders associated with the connector
> + * use drmModeGetConnector() which will do a probe to determine any display
> + * link changes first.
> + */
> +extern drmModeConnectorPtr drmModeGetConnectorCurrent(int fd,
> + uint32_t connector_id);
>
> /**
> * Attaches the given mode to an connector.
> --
> 2.1.4
>
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> dri-devel at lists.freedesktop.org
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--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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