[PATCH v4 10/11] drm/rockchip: analogix_dp: introduce the pclk for grf

Yakir Yang
2016-06-29T09:16:27Z

For RK3399's GRF module, if we want to operate the graphic related grf
registers, we need to enable the pclk_vio_grf which supply power for VIO
GRF IOs, so it's better to introduce an optional grf clock in driver.

Signed-off-by: Yakir Yang <ykk@rock-chips.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Tomasz Figa <tomasz.figa@chromium.com>
---
Changes in v4:
- Add reviewed flag from Doug.
- Add reviewed flag from Tomasz.
- Fix compiled error, sorry.
"dp->cgfclk" --> 'dp->grfclk'
- Check the the error code properly, 'EPROBE_DEFER' should be returned,
'ENOENT' should assign a NULL point to grfclk, other errors should be
regarded as failed. (Tomasz, Doug, reviewed at Google Gerrit)
[https://chromium-review.googlesource.com/#/c/351821/20/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c@249]
- Add the document about optional 'grf' clock (Tomasz, Doug, reviewed at Google Gerrit)
[https://chromium-review.googlesource.com/#/c/351821/]

Changes in v3:
- Add this patch in v3

.../display/rockchip/analogix_dp-rockchip.txt | 6 ++++++
drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 23 +++++++++++++++++++---
2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt b/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt
index 726c945..0b39256 100644
--- a/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt
+++ b/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt
@@ -28,6 +28,12 @@ Required properties:
Port 0: contained 2 endpoints, connecting to the output of vop.
Port 1: contained 1 endpoint, connecting to the input of panel.

+Optional property for different chips:
+- clocks: from common clock binding: handle to grf_vio clock.
+
+- clock-names: from common clock binding:
+ Required elements: "grf"
+
For the below properties, please refer to Analogix DP binding document:
* Documentation/devicetree/bindings/drm/bridge/analogix_dp.txt
- phys (required)
diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index 850edc4..e81e19a 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -64,6 +64,7 @@ struct rockchip_dp_device {
struct drm_display_mode mode;

struct clk *pclk;
+ struct clk *grfclk;
struct regmap *grf;
struct reset_control *rst;

@@ -160,11 +161,17 @@ static void rockchip_dp_drm_encoder_enable(struct drm_encoder *encoder)

dev_dbg(dp->dev, "vop %s output to dp\n", (ret) ? "LIT" : "BIG");

- ret = regmap_write(dp->grf, dp->data->lcdsel_grf_reg, val);
- if (ret != 0) {
- dev_err(dp->dev, "Could not write to GRF: %d\n", ret);
+ ret = clk_prepare_enable(dp->grfclk);
+ if (ret < 0) {
+ dev_err(dp->dev, "failed to enable grfclk %d\n", ret);
return;
}
+
+ ret = regmap_write(dp->grf, dp->data->lcdsel_grf_reg, val);
+ if (ret != 0)
+ dev_err(dp->dev, "Could not write to GRF: %d\n", ret);
+
+ clk_disable_unprepare(dp->grfclk);
}

static void rockchip_dp_drm_encoder_nop(struct drm_encoder *encoder)
@@ -234,6 +241,16 @@ static int rockchip_dp_init(struct rockchip_dp_device *dp)
return PTR_ERR(dp->grf);
}

+ dp->grfclk = devm_clk_get(dev, "grf");
+ if (PTR_ERR(dp->grfclk) == -ENOENT) {
+ dp->grfclk = NULL;
+ } else if (PTR_ERR(dp->grfclk) == -EPROBE_DEFER) {
+ return -EPROBE_DEFER;
+ } else if (IS_ERR(dp->grfclk)) {
+ dev_err(dev, "failed to get grf clock\n");
+ return PTR_ERR(dp->grfclk);
+ }
+
dp->pclk = devm_clk_get(dev, "pclk");
if (IS_ERR(dp->pclk)) {
dev_err(dev, "failed to get pclk property\n");
--
1.9.1