How is the DRM driver framework executed? Read EDID to mode_set?

ximenbingmeng — Thu, 11 Jul 2024 08:38:29 GMT

Tracing the code back to the file drivers/gpu/drm/bridge/cadence/cdns_hdmi_core. c, Function：static int __cdns_hdmi_probe(struct platform_device *pdev,

struct cdns_mhdp_device *mhdp)

mhdp->bridge.base.driver_private = mhdp;

mhdp->bridge.base.funcs = &cdns_hdmi_bridge_funcs; Here, cdns_hdmi_bridge_funcs is initialized.

The structure is defined as follows,

static const struct drm_bridge_funcs cdns_hdmi_bridge_funcs = {

.attach = cdns_hdmi_bridge_attach,

.enable = cdns_hdmi_bridge_enable,

.disable = cdns_hdmi_bridge_disable,

.mode_set = cdns_hdmi_bridge_mode_set,

.mode_valid = cdns_hdmi_bridge_mode_valid,

.mode_fixup = cdns_hdmi_bridge_mode_fixup,

};

So where does the parameter of cdns_hdmi_bridge_mode_set come from? When will it be called?

a. How to print out the EDID in the file drivers/gpu/drm/bridge/cadence/cdns-hdmi-core.c after obtaining the EDID using the static int cdns_hdmi_connector_get_modes(struct drm_connector *connector) function?

b. After obtaining EDID, what function does the DRM driver follow to execute the process to mode_set.

c. How is the DRM driver framework executed?

Re: How is the DRM driver framework executed? Read EDID to mode_set?

AldoG — Fri, 12 Jul 2024 22:08:42 GMT

Hello,

Please refer to the following:
https://github.com/nxp-imx/linux-imx/blob/lf-6.6.y/drivers/gpu/drm/bridge/cadence/cdns-hdmi-core.c#L286

Best regards/Saludos,
Aldo.

topic Re: How is the DRM driver framework executed? Read EDID to mode_set? in i.MX Processors

How is the DRM driver framework executed? Read EDID to mode_set?

Re: How is the DRM driver framework executed? Read EDID to mode_set?