On Tue, 18 Jul 2017 14:05:07 -0700
Eric Anholt <eric@xxxxxxxxxx> wrote:
> The vc4 driver was unusual in that it was delaying the panel lookup
> until the attach step, while most DSI hosts will -EPROBE_DEFER until
> they get a panel.
>
> v2: Drop a debug message that slipped in.
>
> Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
> Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx> (v1)
Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/vc4/vc4_dsi.c | 38 ++++++++++++++------------------------
> 1 file changed, 14 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
> index 57213f4e3c72..769f247c52a9 100644
> --- a/drivers/gpu/drm/vc4/vc4_dsi.c
> +++ b/drivers/gpu/drm/vc4/vc4_dsi.c
> @@ -33,6 +33,7 @@
> #include <drm/drm_crtc_helper.h>
> #include <drm/drm_edid.h>
> #include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_of.h>
> #include <drm/drm_panel.h>
> #include <linux/clk.h>
> #include <linux/clk-provider.h>
> @@ -504,7 +505,6 @@ struct vc4_dsi {
> struct mipi_dsi_host dsi_host;
> struct drm_encoder *encoder;
> struct drm_bridge *bridge;
> - bool is_panel_bridge;
>
> void __iomem *regs;
>
> @@ -1289,7 +1289,6 @@ static int vc4_dsi_host_attach(struct mipi_dsi_host *host,
> struct mipi_dsi_device *device)
> {
> struct vc4_dsi *dsi = host_to_dsi(host);
> - int ret = 0;
>
> dsi->lanes = device->lanes;
> dsi->channel = device->channel;
> @@ -1324,34 +1323,12 @@ static int vc4_dsi_host_attach(struct mipi_dsi_host *host,
> return 0;
> }
>
> - dsi->bridge = of_drm_find_bridge(device->dev.of_node);
> - if (!dsi->bridge) {
> - struct drm_panel *panel =
> - of_drm_find_panel(device->dev.of_node);
> -
> - dsi->bridge = drm_panel_bridge_add(panel,
> - DRM_MODE_CONNECTOR_DSI);
> - if (IS_ERR(dsi->bridge)) {
> - ret = PTR_ERR(dsi->bridge);
> - dsi->bridge = NULL;
> - return ret;
> - }
> - dsi->is_panel_bridge = true;
> - }
> -
> return drm_bridge_attach(dsi->encoder, dsi->bridge, NULL);
> }
>
> static int vc4_dsi_host_detach(struct mipi_dsi_host *host,
> struct mipi_dsi_device *device)
> {
> - struct vc4_dsi *dsi = host_to_dsi(host);
> -
> - if (dsi->is_panel_bridge) {
> - drm_panel_bridge_remove(dsi->bridge);
> - dsi->bridge = NULL;
> - }
> -
> return 0;
> }
>
> @@ -1495,6 +1472,7 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
> struct vc4_dev *vc4 = to_vc4_dev(drm);
> struct vc4_dsi *dsi;
> struct vc4_dsi_encoder *vc4_dsi_encoder;
> + struct drm_panel *panel;
> const struct of_device_id *match;
> dma_cap_mask_t dma_mask;
> int ret;
> @@ -1598,6 +1576,18 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
> return ret;
> }
>
> + ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
> + &panel, &dsi->bridge);
> + if (ret)
> + return ret;
> +
> + if (panel) {
> + dsi->bridge = devm_drm_panel_bridge_add(dev, panel,
> + DRM_MODE_CONNECTOR_DSI);
> + if (IS_ERR(dsi->bridge))
> + return PTR_ERR(dsi->bridge);
> + }
> +
> /* The esc clock rate is supposed to always be 100Mhz. */
> ret = clk_set_rate(dsi->escape_clock, 100 * 1000000);
> if (ret) {
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