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Subject[PATCH 5.5 024/399] drm: rcar-du: Recognize "renesas,vsps" in addition to "vsps"
Date
From: Geert Uytterhoeven <geert+renesas@glider.be>

[ Upstream commit 7b627ce80fbd05885b27f711a5f9820f2b40749a ]

The Renesas-specific "vsps" property lacks a vendor prefix.
Add a "renesas," prefix to comply with DT best practises.
Retain backward compatibility with old DTBs by falling back to "vsps"
when needed.

Fixes: 6d62ef3ac30be756 ("drm: rcar-du: Expose the VSP1 compositor through KMS planes")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/rcar-du/rcar_du_kms.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
index 0d59f390de19a..662d8075f4116 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -542,6 +542,7 @@ static int rcar_du_properties_init(struct rcar_du_device *rcdu)
static int rcar_du_vsps_init(struct rcar_du_device *rcdu)
{
const struct device_node *np = rcdu->dev->of_node;
+ const char *vsps_prop_name = "renesas,vsps";
struct of_phandle_args args;
struct {
struct device_node *np;
@@ -557,15 +558,21 @@ static int rcar_du_vsps_init(struct rcar_du_device *rcdu)
* entry contains a pointer to the VSP DT node and a bitmask of the
* connected DU CRTCs.
*/
- cells = of_property_count_u32_elems(np, "vsps") / rcdu->num_crtcs - 1;
+ ret = of_property_count_u32_elems(np, vsps_prop_name);
+ if (ret < 0) {
+ /* Backward compatibility with old DTBs. */
+ vsps_prop_name = "vsps";
+ ret = of_property_count_u32_elems(np, vsps_prop_name);
+ }
+ cells = ret / rcdu->num_crtcs - 1;
if (cells > 1)
return -EINVAL;

for (i = 0; i < rcdu->num_crtcs; ++i) {
unsigned int j;

- ret = of_parse_phandle_with_fixed_args(np, "vsps", cells, i,
- &args);
+ ret = of_parse_phandle_with_fixed_args(np, vsps_prop_name,
+ cells, i, &args);
if (ret < 0)
goto error;

@@ -587,8 +594,8 @@ static int rcar_du_vsps_init(struct rcar_du_device *rcdu)

/*
* Store the VSP pointer and pipe index in the CRTC. If the
- * second cell of the 'vsps' specifier isn't present, default
- * to 0 to remain compatible with older DT bindings.
+ * second cell of the 'renesas,vsps' specifier isn't present,
+ * default to 0 to remain compatible with older DT bindings.
*/
rcdu->crtcs[i].vsp = &rcdu->vsps[j];
rcdu->crtcs[i].vsp_pipe = cells >= 1 ? args.args[0] : 0;
--
2.20.1


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