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imx-drm: imx-drm-core: provide helper function to parse possible crtcs

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Provide a helper function to parse possible crtcs before the encoder
is registered.  The crtc mask is derived from the position of the
CRTCs registered in the drm_device.

Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2013-11-03 14:04:47 +00:00
parent 32266b4520
commit 9e2d410d18
2 changed files with 68 additions and 0 deletions
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66
drivers/staging/imx-drm/imx-drm-core.c
View File

@ -658,6 +658,72 @@ err_busy:
}
EXPORT_SYMBOL_GPL(imx_drm_add_encoder);
/*
* Find the DRM CRTC possible mask for the device node cookie/id.
*
* The encoder possible masks are defined by their position in the
* mode_config crtc_list. This means that CRTCs must not be added
* or removed once the DRM device has been fully initialised.
*/
static uint32_t imx_drm_find_crtc_mask(struct imx_drm_device *imxdrm,
void *cookie, int id)
{
unsigned i;
for (i = 0; i < MAX_CRTC; i++) {
struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[i];
if (imx_drm_crtc && imx_drm_crtc->cookie.id == id &&
imx_drm_crtc->cookie.cookie == cookie)
return drm_crtc_mask(imx_drm_crtc->crtc);
}
return 0;
}
int imx_drm_encoder_parse_of(struct drm_device *drm,
struct drm_encoder *encoder, struct device_node *np)
{
struct imx_drm_device *imxdrm = drm->dev_private;
uint32_t crtc_mask = 0;
int i, ret = 0;
for (i = 0; !ret; i++) {
struct of_phandle_args args;
uint32_t mask;
int id;
ret = of_parse_phandle_with_args(np, "crtcs", "#crtc-cells", i,
&args);
if (ret == -ENOENT)
break;
if (ret < 0)
return ret;
id = args.args_count > 0 ? args.args[0] : 0;
mask = imx_drm_find_crtc_mask(imxdrm, args.np, id);
of_node_put(args.np);
/*
* If we failed to find the CRTC(s) which this encoder is
* supposed to be connected to, it's because the CRTC has
* not been registered yet. Defer probing, and hope that
* the required CRTC is added later.
*/
if (mask == 0)
return -EPROBE_DEFER;
crtc_mask |= mask;
}
encoder->possible_crtcs = crtc_mask;
/* FIXME: this is the mask of outputs which can clone this output. */
encoder->possible_clones = ~0;
return 0;
}
EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
int imx_drm_encoder_add_possible_crtcs(
struct imx_drm_encoder *imx_drm_encoder,
struct device_node *np)

2
drivers/staging/imx-drm/imx-drm.h
View File

@ -64,6 +64,8 @@ struct device_node;
int imx_drm_encoder_get_mux_id(struct drm_encoder *encoder);
int imx_drm_encoder_add_possible_crtcs(struct imx_drm_encoder *imx_drm_encoder,
struct device_node *np);
int imx_drm_encoder_parse_of(struct drm_device *drm,
struct drm_encoder *encoder, struct device_node *np);
int imx_drm_connector_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode);