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Message-ID: <3ud27r322pkaflcs2bw7fwomymt4niws6nchmosjfhlcxr2wek@fvycunfo3rdn>
Date: Wed, 25 Oct 2023 16:07:03 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Keith Zhao <keith.zhao@...rfivetech.com>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Emil Renner Berthing <kernel@...il.dk>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Thomas Zimmermann <tzimmermann@...e.de>,
Philipp Zabel <p.zabel@...gutronix.de>,
Sumit Semwal <sumit.semwal@...aro.org>,
christian.koenig@....com, Bjorn Andersson <andersson@...nel.org>,
Heiko Stuebner <heiko@...ech.de>,
Shawn Guo <shawnguo@...nel.org>, Jagan Teki <jagan@...eble.ai>,
Chris Morgan <macromorgan@...mail.com>,
Jack Zhu <jack.zhu@...rfivetech.com>,
Shengyang Chen <shengyang.chen@...rfivetech.com>,
Changhuang Liang <changhuang.liang@...rfivetech.com>
Subject: Re: [PATCH v2 6/6] drm/vs: Add hdmi driver
On Wed, Oct 25, 2023 at 06:39:57PM +0800, Keith Zhao wrote:
> +static int starfive_hdmi_setup(struct starfive_hdmi *hdmi,
> + struct drm_display_mode *mode)
> +{
> + hdmi_modb(hdmi, STARFIVE_BIAS_CONTROL, STARFIVE_BIAS_ENABLE, STARFIVE_BIAS_ENABLE);
> + hdmi_writeb(hdmi, STARFIVE_RX_CONTROL, STARFIVE_RX_ENABLE);
> + hdmi->hdmi_data.vic = drm_match_cea_mode(mode);
You're never using that variable.
> + hdmi->tmds_rate = mode->clock * 1000;
> + starfive_hdmi_phy_clk_set_rate(hdmi);
> +
> + while (!(hdmi_readb(hdmi, STARFIVE_PRE_PLL_LOCK_STATUS) & 0x1))
> + continue;
> + while (!(hdmi_readb(hdmi, STARFIVE_POST_PLL_LOCK_STATUS) & 0x1))
> + continue;
> +
> + /*turn on LDO*/
> + hdmi_writeb(hdmi, STARFIVE_LDO_CONTROL, STARFIVE_LDO_ENABLE);
> + /*turn on serializer*/
> + hdmi_writeb(hdmi, STARFIVE_SERIALIER_CONTROL, STARFIVE_SERIALIER_ENABLE);
> +
> + starfive_hdmi_tx_phy_power_down(hdmi);
> + starfive_hdmi_config_video_timing(hdmi, mode);
> + starfive_hdmi_tx_phy_power_on(hdmi);
> +
> + starfive_hdmi_tmds_driver_on(hdmi);
> + starfive_hdmi_sync_tmds(hdmi);
> +
> + return 0;
> +}
> +
> +static void starfive_hdmi_encoder_mode_set(struct drm_encoder *encoder,
> + struct drm_display_mode *mode,
> + struct drm_display_mode *adj_mode)
> +{
> + struct starfive_hdmi *hdmi = encoder_to_hdmi(encoder);
> +
> + drm_mode_copy(&hdmi->previous_mode, adj_mode);
> +}
You're never using that field, and it's not the previous mode, but the current mode.
> +static void starfive_hdmi_encoder_enable(struct drm_encoder *encoder)
> +{
> + struct starfive_hdmi *hdmi = encoder_to_hdmi(encoder);
> + struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
> + int ret, idx;
> + struct drm_device *drm = hdmi->connector.dev;
> +
> + if (drm && !drm_dev_enter(drm, &idx))
> + return;
> +
> + ret = pm_runtime_get_sync(hdmi->dev);
> + if (ret < 0)
> + return;
pm_runtime_resume_and_get is what you want here
> + mdelay(10);
???
Sprinkling delays here and there isn't great. What is the issue this is
trying to workaround?
> + starfive_hdmi_setup(hdmi, mode);
> +
> + if (drm)
> + drm_dev_exit(idx);
> +}
> +
> +static void starfive_hdmi_encoder_disable(struct drm_encoder *encoder)
> +{
> + struct starfive_hdmi *hdmi = encoder_to_hdmi(encoder);
> +
> + int idx;
> + struct drm_device *drm = hdmi->connector.dev;
> +
> + if (drm && !drm_dev_enter(drm, &idx))
> + return;
> +
> + pm_runtime_put(hdmi->dev);
pm_runtime calls should be safe anytime. If you need to protect them
through a drm_dev_enter call, that call should be in the pm_runtime hook
itself.
> + if (drm)
> + drm_dev_exit(idx);
> +}
> +
> +static int
> +starfive_hdmi_encoder_atomic_check(struct drm_encoder *encoder,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state)
> +{
> + bool valid = false;
> + struct drm_display_mode *mode = &crtc_state->adjusted_mode;
> + struct vs_crtc_state *vs_crtc_state = to_vs_crtc_state(crtc_state);
> +
> + vs_crtc_state->encoder_type = encoder->encoder_type;
> + vs_crtc_state->output_fmt = MEDIA_BUS_FMT_RGB888_1X24;
Ok, so those two will always be ENCODER_TMDS and RGB888. Drop them from
your CRTC state and use the proper defines there.
> + const struct pre_pll_config *cfg = pre_pll_cfg_table;
> + int pclk = mode->clock * 1000;
> +
> + for (; cfg->pixclock != 0; cfg++) {
> + if (pclk == cfg->pixclock) {
> + if (pclk > 297000000)
> + continue;
> +
> + valid = true;
> + break;
> + }
> + }
> +
> + return (valid) ? 0 : -EINVAL;
> +}
> +
> +static const struct drm_encoder_helper_funcs starfive_hdmi_encoder_helper_funcs = {
> + .enable = starfive_hdmi_encoder_enable,
> + .disable = starfive_hdmi_encoder_disable,
> + .mode_set = starfive_hdmi_encoder_mode_set,
> + .atomic_check = starfive_hdmi_encoder_atomic_check,
> +};
> +
> +static enum drm_connector_status
> +starfive_hdmi_connector_detect(struct drm_connector *connector, bool force)
> +{
> + struct starfive_hdmi *hdmi = connector_to_hdmi(connector);
> + struct drm_device *drm = hdmi->connector.dev;
> + int ret;
> + int idx;
> +
> + if (drm && !drm_dev_enter(drm, &idx))
> + return connector_status_disconnected;
> +
> + ret = pm_runtime_get_sync(hdmi->dev);
> + if (ret < 0)
> + return ret;
> +
> + ret = (hdmi_readb(hdmi, HDMI_STATUS) & m_HOTPLUG) ?
> + connector_status_connected : connector_status_disconnected;
> + pm_runtime_put(hdmi->dev);
> +
> + if (drm)
> + drm_dev_exit(idx);
> +
> + return ret;
> +}
> +
> +static int starfive_hdmi_connector_get_modes(struct drm_connector *connector)
> +{
> + struct starfive_hdmi *hdmi = connector_to_hdmi(connector);
> + struct edid *edid;
> + int ret = 0;
> +
> + if (!hdmi->ddc)
> + return 0;
> + ret = pm_runtime_get_sync(hdmi->dev);
> + if (ret < 0)
> + return ret;
> +
> + edid = drm_get_edid(connector, hdmi->ddc);
> + if (edid) {
> + hdmi->hdmi_data.sink_is_hdmi = drm_detect_hdmi_monitor(edid);
You're not using that field anywhere, and it's available in drm_display_info already.
> + hdmi->hdmi_data.sink_has_audio = drm_detect_monitor_audio(edid);
Ditto
> +struct hdmi_data_info {
> + int vic;
> + bool sink_is_hdmi;
> + bool sink_has_audio;
> + unsigned int enc_in_format;
You're not using it
> + unsigned int enc_out_format;
Ditto
> + unsigned int colorimetry;
Ditto
Which means that as things stands, you can get rid of that entire
structure.
> +};
> +
> +struct starfive_hdmi {
> + struct device *dev;
> + struct drm_device *drm_dev;
> + struct drm_encoder encoder;
> + struct drm_connector connector;
> +
> + struct starfive_hdmi_i2c *i2c;
> +
> + int irq;
> + struct clk *sys_clk;
> + struct clk *mclk;
> + struct clk *bclk;
> + struct reset_control *tx_rst;
> + void __iomem *regs;
> +
> + struct i2c_adapter *ddc;
> +
> + unsigned long tmds_rate;
You're not using that either.
Maxime
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