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drm/vc4: Fix oops dereferencing DPI's connector since panel_bridge. 

In the cleanup, I didn't notice that we needed to dereference the
connector for the bus_format.  Fix the regression by looking up the
first (and only) connector attached to us, and assume that its
bus_format is what we want.  Some day it would be good to have that
part of display_info attached to the bridge, instead.

v2: Fix stray whitespace change

Signed-off-by: Eric Anholt <eric@anholt.net>
Fixes: 7b1298e053 ("drm/vc4: Switch DPI to using the panel-bridge helper.")
Link: https://patchwork.freedesktop.org/patch/msgid/20180309233256.1667-1-eric@anholt.net
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
This commit is contained in:
Eric Anholt 2018-03-09 15:32:56 -08:00 committed by Sean Paul
parent b5cb2e5a1f
commit 164c2416dd
1 changed files with 22 additions and 3 deletions
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25
drivers/gpu/drm/vc4/vc4_dpi.c
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@ -96,7 +96,6 @@ struct vc4_dpi {
struct platform_device *pdev;
struct drm_encoder *encoder;
struct drm_connector *connector;
void __iomem *regs;
@ -164,14 +163,31 @@ static void vc4_dpi_encoder_disable(struct drm_encoder *encoder)
static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
{
struct drm_device *dev = encoder->dev;
struct drm_display_mode *mode = &encoder->crtc->mode;
struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder);
struct vc4_dpi *dpi = vc4_encoder->dpi;
struct drm_connector_list_iter conn_iter;
struct drm_connector *connector = NULL, *connector_scan;
u32 dpi_c = DPI_ENABLE | DPI_OUTPUT_ENABLE_MODE;
int ret;
if (dpi->connector->display_info.num_bus_formats) {
u32 bus_format = dpi->connector->display_info.bus_formats[0];
/* Look up the connector attached to DPI so we can get the
* bus_format. Ideally the bridge would tell us the
* bus_format we want, but it doesn't yet, so assume that it's
* uniform throughout the bridge chain.
*/
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector_scan, &conn_iter) {
if (connector_scan->encoder == encoder) {
connector = connector_scan;
break;
}
}
drm_connector_list_iter_end(&conn_iter);
if (connector && connector->display_info.num_bus_formats) {
u32 bus_format = connector->display_info.bus_formats[0];
switch (bus_format) {
case MEDIA_BUS_FMT_RGB888_1X24:
@ -199,6 +215,9 @@ static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
DRM_ERROR("Unknown media bus format %d\n", bus_format);
break;
}
} else {
/* Default to 24bit if no connector found. */
dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB, DPI_FORMAT);
}
if (mode->flags & DRM_MODE_FLAG_NHSYNC)