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Message-ID: <CA+Px+wWwudeG5BLOkgcq_sJqfTxmre1O=XqU8OM6oqC966TUuQ@mail.gmail.com>
Date: Fri, 5 Jul 2019 15:09:08 +0800
From: Tzung-Bi Shih <tzungbi@...gle.com>
To: Cheng-Yi Chiang <cychiang@...omium.org>
Cc: linux-kernel@...r.kernel.org, Hans Verkuil <hverkuil@...all.nl>,
Mark Brown <broonie@...nel.org>,
Liam Girdwood <lgirdwood@...il.com>,
Takashi Iwai <tiwai@...e.com>,
Jaroslav Kysela <perex@...ex.cz>,
Russell King <rmk+kernel@...linux.org.uk>,
Andrzej Hajda <a.hajda@...sung.com>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Heiko Stuebner <heiko@...ech.de>, dianders@...omium.org,
dgreid@...omium.org, tzungbi@...omium.org,
ALSA development <alsa-devel@...a-project.org>,
dri-devel@...ts.freedesktop.org,
linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH 2/4] drm: bridge: dw-hdmi: Report connector status using callback
On Fri, Jul 5, 2019 at 12:26 PM Cheng-Yi Chiang <cychiang@...omium.org> wrote:
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h
> index 63b5756f463b..f523c590984e 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h
> @@ -2,6 +2,8 @@
> #ifndef DW_HDMI_AUDIO_H
> #define DW_HDMI_AUDIO_H
>
> +#include <sound/hdmi-codec.h>
> +
> struct dw_hdmi;
>
> struct dw_hdmi_audio_data {
> @@ -17,6 +19,7 @@ struct dw_hdmi_i2s_audio_data {
>
> void (*write)(struct dw_hdmi *hdmi, u8 val, int offset);
> u8 (*read)(struct dw_hdmi *hdmi, int offset);
> + int (*set_plugged_cb)(struct dw_hdmi *hdmi, hdmi_codec_plugged_cb fn);
> };
>
> #endif
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
> index 5cbb71a866d5..7b93cf05c985 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
> @@ -104,10 +104,20 @@ static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
> return -EINVAL;
> }
>
> +static int dw_hdmi_i2s_hook_plugged_cb(struct device *dev, void *data,
> + hdmi_codec_plugged_cb fn)
> +{
> + struct dw_hdmi_i2s_audio_data *audio = data;
> + struct dw_hdmi *hdmi = audio->hdmi;
> +
> + return audio->set_plugged_cb(hdmi, fn);
> +}
> +
The first parameter dev could be removed. Not used.
> static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
> .hw_params = dw_hdmi_i2s_hw_params,
> .audio_shutdown = dw_hdmi_i2s_audio_shutdown,
> .get_dai_id = dw_hdmi_i2s_get_dai_id,
> + .hook_plugged_cb = dw_hdmi_i2s_hook_plugged_cb,
> };
>
> static int snd_dw_hdmi_probe(struct platform_device *pdev)
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 045b1b13fd0e..c69a399fc7ca 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -26,6 +26,8 @@
> #include <drm/drm_probe_helper.h>
> #include <drm/bridge/dw_hdmi.h>
>
> +#include <sound/hdmi-codec.h>
> +
> #include <uapi/linux/media-bus-format.h>
> #include <uapi/linux/videodev2.h>
>
> @@ -185,6 +187,9 @@ struct dw_hdmi {
> void (*disable_audio)(struct dw_hdmi *hdmi);
>
> struct cec_notifier *cec_notifier;
> +
> + hdmi_codec_plugged_cb plugged_cb;
> + enum drm_connector_status last_connector_result;
> };
>
> #define HDMI_IH_PHY_STAT0_RX_SENSE \
> @@ -209,6 +214,17 @@ static inline u8 hdmi_readb(struct dw_hdmi *hdmi, int offset)
> return val;
> }
>
> +static int hdmi_set_plugged_cb(struct dw_hdmi *hdmi, hdmi_codec_plugged_cb fn)
> +{
> + mutex_lock(&hdmi->mutex);
> + hdmi->plugged_cb = fn;
> + if (hdmi->audio && !IS_ERR(hdmi->audio))
I would expect if IS_ERR(hdmi->audio), then this should not be called
(i.e. should exit somewhere earlier).
> + fn(hdmi->audio,
> + hdmi->last_connector_result == connector_status_connected);
> + mutex_unlock(&hdmi->mutex);
> + return 0;
> +}
> +
> static void hdmi_modb(struct dw_hdmi *hdmi, u8 data, u8 mask, unsigned reg)
> {
> regmap_update_bits(hdmi->regm, reg << hdmi->reg_shift, mask, data);
> @@ -2044,6 +2060,7 @@ dw_hdmi_connector_detect(struct drm_connector *connector, bool force)
> {
> struct dw_hdmi *hdmi = container_of(connector, struct dw_hdmi,
> connector);
> + enum drm_connector_status result;
>
> mutex_lock(&hdmi->mutex);
> hdmi->force = DRM_FORCE_UNSPECIFIED;
> @@ -2051,7 +2068,20 @@ dw_hdmi_connector_detect(struct drm_connector *connector, bool force)
> dw_hdmi_update_phy_mask(hdmi);
> mutex_unlock(&hdmi->mutex);
>
> - return hdmi->phy.ops->read_hpd(hdmi, hdmi->phy.data);
> + result = hdmi->phy.ops->read_hpd(hdmi, hdmi->phy.data);
> +
> + mutex_lock(&hdmi->mutex);
> + if (result != hdmi->last_connector_result) {
> + dev_dbg(hdmi->dev, "read_hpd result: %d", result);
> + if (hdmi->plugged_cb && hdmi->audio && !IS_ERR(hdmi->audio)) {
Share the same concern above.
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