On Mon, 18 May 2020 19:39:07 +0200
Enric Balletbo i Serra <enric.balle...@collabora.com> wrote:
> This is really a cosmetic change just to make a bit more readable the
> code after convert the driver to drm_bridge. The bridge variable name
> will be used by the encoder drm_bridge, and the chained bridge will be
> named next_bridge.
>
> Signed-off-by: Enric Balletbo i Serra <enric.balle...@collabora.com>
> Reviewed-by: Chun-Kuang Hu <chunkuang...@kernel.org>
> ---
>
> drivers/gpu/drm/mediatek/mtk_dpi.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 7fbfa95bab09..7112125dc3d1 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -61,7 +61,7 @@ enum mtk_dpi_out_color_format {
> struct mtk_dpi {
> struct mtk_ddp_comp ddp_comp;
> struct drm_encoder encoder;
> - struct drm_bridge *bridge;
> + struct drm_bridge *next_bridge;
Did you consider moving the drm_of_find_panel_or_bridge() call to
mtk_dpi_bind() so you can get rid of this field?
This makes we realize there's no refcounting on bridges, which means
the bridge can vanish between the drm_of_find_panel_or_bridge() and
drm_bridge_attach() calls :-/.
> void __iomem *regs;
> struct device *dev;
> struct clk *engine_clk;
> @@ -607,7 +607,7 @@ static int mtk_dpi_bind(struct device *dev, struct device
> *master, void *data)
> /* Currently DPI0 is fixed to be driven by OVL1 */
> dpi->encoder.possible_crtcs = BIT(1);
>
> - ret = drm_bridge_attach(&dpi->encoder, dpi->bridge, NULL, 0);
> + ret = drm_bridge_attach(&dpi->encoder, dpi->next_bridge, NULL, 0);
> if (ret) {
> dev_err(dev, "Failed to attach bridge: %d\n", ret);
> goto err_cleanup;
> @@ -747,11 +747,11 @@ static int mtk_dpi_probe(struct platform_device *pdev)
> }
>
> ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
> - NULL, &dpi->bridge);
> + NULL, &dpi->next_bridge);
> if (ret)
> return ret;
>
> - dev_info(dev, "Found bridge node: %pOF\n", dpi->bridge->of_node);
> + dev_info(dev, "Found bridge node: %pOF\n", dpi->next_bridge->of_node);
>
> comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DPI);
> if (comp_id < 0) {
