blob: dd01849b334969fba9ea67f4d69cbce8fdb49085 [file] [log] [blame]
From 46d5f742d13f01c4437253587a916c3954b5de64 Mon Sep 17 00:00:00 2001
From: Pierre-Hugues Husson <phh@phh.me>
Date: Sat, 25 Nov 2017 21:18:44 +0100
Subject: [PATCH 0010/1795] drm/bridge: synopsys/dw-hdmi: Enable cec clock
Support the "cec" optional clock. The documentation already mentions "cec"
optional clock and it is used by several boards, but currently the driver
doesn't enable it, thus preventing cec from working on those boards.
And even worse: a /dev/cecX device will appear for those boards, but it
won't be functioning without configuring this clock.
Changes:
v4:
- Change commit message to stress the importance of this patch
v3:
- Drop useless braces
v2:
- Separate ENOENT errors from others
- Propagate other errors (especially -EPROBE_DEFER)
Signed-off-by: Pierre-Hugues Husson <phh@phh.me>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20171125201844.11353-1-phh@phh.me
(cherry picked from commit ebe32c3e282a62974b190b9d514864fc0d56716e)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 25 +++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 4db31b89507c..994f16727458 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -138,6 +138,7 @@ struct dw_hdmi {
struct device *dev;
struct clk *isfr_clk;
struct clk *iahb_clk;
+ struct clk *cec_clk;
struct dw_hdmi_i2c *i2c;
struct hdmi_data_info hdmi_data;
@@ -2385,6 +2386,26 @@ __dw_hdmi_probe(struct platform_device *pdev,
goto err_isfr;
}
+ hdmi->cec_clk = devm_clk_get(hdmi->dev, "cec");
+ if (PTR_ERR(hdmi->cec_clk) == -ENOENT) {
+ hdmi->cec_clk = NULL;
+ } else if (IS_ERR(hdmi->cec_clk)) {
+ ret = PTR_ERR(hdmi->cec_clk);
+ if (ret != -EPROBE_DEFER)
+ dev_err(hdmi->dev, "Cannot get HDMI cec clock: %d\n",
+ ret);
+
+ hdmi->cec_clk = NULL;
+ goto err_iahb;
+ } else {
+ ret = clk_prepare_enable(hdmi->cec_clk);
+ if (ret) {
+ dev_err(hdmi->dev, "Cannot enable HDMI cec clock: %d\n",
+ ret);
+ goto err_iahb;
+ }
+ }
+
/* Product and revision IDs */
hdmi->version = (hdmi_readb(hdmi, HDMI_DESIGN_ID) << 8)
| (hdmi_readb(hdmi, HDMI_REVISION_ID) << 0);
@@ -2521,6 +2542,8 @@ __dw_hdmi_probe(struct platform_device *pdev,
cec_notifier_put(hdmi->cec_notifier);
clk_disable_unprepare(hdmi->iahb_clk);
+ if (hdmi->cec_clk)
+ clk_disable_unprepare(hdmi->cec_clk);
err_isfr:
clk_disable_unprepare(hdmi->isfr_clk);
err_res:
@@ -2544,6 +2567,8 @@ static void __dw_hdmi_remove(struct dw_hdmi *hdmi)
clk_disable_unprepare(hdmi->iahb_clk);
clk_disable_unprepare(hdmi->isfr_clk);
+ if (hdmi->cec_clk)
+ clk_disable_unprepare(hdmi->cec_clk);
if (hdmi->i2c)
i2c_del_adapter(&hdmi->i2c->adap);
--
2.19.0