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Message-ID: <11b7a01889d9e0c5c3598f173be823e1e39ed397.camel@mediatek.com>
Date: Mon, 3 Jan 2022 09:49:58 +0800
From: CK Hu <ck.hu@...iatek.com>
To: Guillaume Ranquet <granquet@...libre.com>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
"David Airlie" <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
"Matthias Brugger" <matthias.bgg@...il.com>
CC: kernel test robot <lkp@...el.com>, <linux-kernel@...r.kernel.org>,
<dri-devel@...ts.freedesktop.org>,
Markus Schneider-Pargmann <msp@...libre.com>,
<linux-mediatek@...ts.infradead.org>,
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v7 7/8] drm/mediatek: Add mt8195 DisplayPort driver
Hi, Guillaume:
This is a big patch, so I give you some comment first, and I would
continue to review this patch.
On Fri, 2021-12-17 at 16:08 +0100, Guillaume Ranquet wrote:
> From: Markus Schneider-Pargmann <msp@...libre.com>
>
> This patch adds a DisplayPort driver for the Mediatek mt8195 SoC.
>
> It supports the mt8195, the external DisplayPort units. It offers
> hot-plug-detection, audio up to 8 channels, and DisplayPort 1.4 with
> up
> to 4 lanes.
>
> The driver creates a child device for the phy. The child device will
> never exist without the parent being active. As they are sharing a
> register range, the parent passes a regmap pointer to the child so
> that
> both can work with the same register range. The phy driver sets
> device
> data that is read by the parent to get the phy device that can be
> used
> to control the phy properties.
>
> This driver is based on an initial version by
> Jason-JH.Lin <jason-jh.lin@...iatek.com>.
>
> Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> Reported-by: kernel test robot <lkp@...el.com>
> ---
> drivers/gpu/drm/mediatek/Kconfig | 7 +
> drivers/gpu/drm/mediatek/Makefile | 2 +
> drivers/gpu/drm/mediatek/mtk_dp.c | 3028
> ++++++++++++++++++++++++
> drivers/gpu/drm/mediatek/mtk_dp_reg.h | 568 +++++
> drivers/gpu/drm/mediatek/mtk_drm_drv.c | 1 +
> drivers/gpu/drm/mediatek/mtk_drm_drv.h | 1 +
> 6 files changed, 3607 insertions(+)
> create mode 100644 drivers/gpu/drm/mediatek/mtk_dp.c
> create mode 100644 drivers/gpu/drm/mediatek/mtk_dp_reg.h
>
> diff --git a/drivers/gpu/drm/mediatek/Kconfig
> b/drivers/gpu/drm/mediatek/Kconfig
> index 2976d21e9a34a..029b94c716131 100644
> --- a/drivers/gpu/drm/mediatek/Kconfig
> +++ b/drivers/gpu/drm/mediatek/Kconfig
> @@ -28,3 +28,10 @@ config DRM_MEDIATEK_HDMI
> select PHY_MTK_HDMI
> help
> DRM/KMS HDMI driver for Mediatek SoCs
> +
> +config MTK_DPTX_SUPPORT
> + tristate "DRM DPTX Support for Mediatek SoCs"
> + depends on DRM_MEDIATEK
> + select PHY_MTK_DP
> + help
> + DRM/KMS Display Port driver for Mediatek SoCs.
> diff --git a/drivers/gpu/drm/mediatek/Makefile
> b/drivers/gpu/drm/mediatek/Makefile
> index 29098d7c8307c..d86a6406055e6 100644
> --- a/drivers/gpu/drm/mediatek/Makefile
> +++ b/drivers/gpu/drm/mediatek/Makefile
> @@ -21,3 +21,5 @@ mediatek-drm-hdmi-objs := mtk_cec.o \
> mtk_hdmi_ddc.o
>
> obj-$(CONFIG_DRM_MEDIATEK_HDMI) += mediatek-drm-hdmi.o
> +
> +obj-$(CONFIG_MTK_DPTX_SUPPORT) += mtk_dp.o
>
[snip]
> +
> +enum mtk_dp_train_state {
> + MTK_DP_TRAIN_STATE_STARTUP = 0,
> + MTK_DP_TRAIN_STATE_CHECKCAP,
> + MTK_DP_TRAIN_STATE_CHECKEDID,
> + MTK_DP_TRAIN_STATE_TRAINING_PRE,
> + MTK_DP_TRAIN_STATE_TRAINING,
> + MTK_DP_TRAIN_STATE_CHECKTIMING,
> + MTK_DP_TRAIN_STATE_NORMAL,
> + MTK_DP_TRAIN_STATE_POWERSAVE,
Never be this state, so remove it.
> + MTK_DP_TRAIN_STATE_DPIDLE,
> +};
> +
> +struct mtk_dp_timings {
> + struct videomode vm;
> +
> + u16 htotal;
> + u16 vtotal;
> + u8 frame_rate;
> + u32 pix_rate_khz;
> +};
> +
> +struct mtk_dp_train_info {
> + bool tps3;
> + bool tps4;
> + bool sink_ssc;
> + bool cable_plugged_in;
> + bool cable_state_change;
> + bool cr_done;
> + bool eq_done;
> +
> + // link_rate is in multiple of 0.27Gbps
> + int link_rate;
> + int lane_count;
> +
> + int irq_status;
> + int check_cap_count;
> +};
> +
>
[snip]
>
> +
> +static u32 mtk_dp_swirq_get_clear(struct mtk_dp *mtk_dp)
> +{
> + u32 irq_status = mtk_dp_read(mtk_dp, MTK_DP_TRANS_P0_35D0) &
> + SW_IRQ_FINAL_STATUS_DP_TRANS_P0_MASK;
> +
> + if (irq_status) {
> + mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_35C8,
> irq_status,
> + SW_IRQ_CLR_DP_TRANS_P0_MASK);
SW_IRQ_CLR_DP_TRANS_P0_MASK is already set, so this setting is
redundant, so remove this.
> + mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_35C8, 0,
> + SW_IRQ_CLR_DP_TRANS_P0_MASK);
> + }
> +
> + return irq_status;
> +}
> +
> +static u32 mtk_dp_hwirq_get_clear(struct mtk_dp *mtk_dp)
> +{
> + u8 irq_status = (mtk_dp_read(mtk_dp, MTK_DP_TRANS_P0_3418) &
> + IRQ_STATUS_DP_TRANS_P0_MASK) >>
> + IRQ_STATUS_DP_TRANS_P0_SHIFT;
> +
> + if (irq_status) {
> + mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3418,
> irq_status,
> + IRQ_CLR_DP_TRANS_P0_MASK);
IRQ_CLR_DP_TRANS_P0_MASK is already set, so this setting is redundant,
so remove this.
> + mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3418, 0,
> + IRQ_CLR_DP_TRANS_P0_MASK);
> + }
> +
> + return irq_status;
> +}
> +
> +static void mtk_dp_hwirq_enable(struct mtk_dp *mtk_dp, bool enable)
> +{
> + u32 val = 0;
> +
> + if (!enable)
> + val = IRQ_MASK_DP_TRANS_P0_DISC_IRQ |
> + IRQ_MASK_DP_TRANS_P0_CONN_IRQ |
> + IRQ_MASK_DP_TRANS_P0_INT_IRQ;
> + mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3418, val,
> + IRQ_MASK_DP_TRANS_P0_MASK);
> +}
> +
> +void mtk_dp_initialize_settings(struct mtk_dp *mtk_dp)
> +{
> + mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_342C,
> + XTAL_FREQ_DP_TRANS_P0_DEFAULT,
> + XTAL_FREQ_DP_TRANS_P0_MASK);
> + mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3540,
> + BIT(FEC_CLOCK_EN_MODE_DP_TRANS_P0_SHIFT),
> + FEC_CLOCK_EN_MODE_DP_TRANS_P0_MASK);
> + mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_31EC,
> + BIT(AUDIO_CH_SRC_SEL_DP_ENC0_P0_SHIFT),
> + AUDIO_CH_SRC_SEL_DP_ENC0_P0_MASK);
> + mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_304C, 0,
> + SDP_VSYNC_RISING_MASK_DP_ENC0_P0_MASK);
> + mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_IRQ_MASK,
> IRQ_MASK_AUX_TOP_IRQ,
> + IRQ_MASK_AUX_TOP_IRQ);
> +}
> +
> +static void mtk_dp_initialize_hpd_detect_settings(struct mtk_dp
> *mtk_dp)
> +{
> + // Debounce threshold
/* ... */
> + mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3410,
> + 8 << HPD_DEB_THD_DP_TRANS_P0_SHIFT,
> + HPD_DEB_THD_DP_TRANS_P0_MASK);
> + mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3410,
> + (HPD_INT_THD_DP_TRANS_P0_LOWER_500US |
> + HPD_INT_THD_DP_TRANS_P0_UPPER_1100US)
> + << HPD_INT_THD_DP_TRANS_P0_SHIFT,
> + HPD_INT_THD_DP_TRANS_P0_MASK);
> +
> + // Connect threshold 1.5ms + 5 x 0.1ms = 2ms
> + // Disconnect threshold 1.5ms + 5 x 0.1ms = 2ms
> + mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3410,
> + (5 << HPD_DISC_THD_DP_TRANS_P0_SHIFT) |
> + (5 <<
> HPD_CONN_THD_DP_TRANS_P0_SHIFT),
> + HPD_DISC_THD_DP_TRANS_P0_MASK |
> + HPD_CONN_THD_DP_TRANS_P0_MASK);
> + mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3430,
> + HPD_INT_THD_ECO_DP_TRANS_P0_HIGH_BOUND_EXT,
> + HPD_INT_THD_ECO_DP_TRANS_P0_MASK);
> +}
> +
>
[snip]
> +
> +static int mtk_dp_train_handler(struct mtk_dp *mtk_dp)
> +{
> + int ret = 0;
> +
> + if (mtk_dp->train_state == MTK_DP_TRAIN_STATE_NORMAL)
> + return ret;
> +
> + switch (mtk_dp->train_state) {
> + case MTK_DP_TRAIN_STATE_STARTUP:
> + mtk_dp->train_state = MTK_DP_TRAIN_STATE_CHECKCAP;
> + break;
> +
> + case MTK_DP_TRAIN_STATE_CHECKCAP:
> + if (mtk_dp_parse_capabilities(mtk_dp)) {
> + mtk_dp->train_info.check_cap_count = 0;
> + mtk_dp->train_state =
> MTK_DP_TRAIN_STATE_CHECKEDID;
> + } else {
> + mtk_dp->train_info.check_cap_count++;
> +
> + if (mtk_dp->train_info.check_cap_count >
> + MTK_DP_CHECK_SINK_CAP_TIMEOUT_COUNT) {
> + mtk_dp->train_info.check_cap_count = 0;
> + mtk_dp->train_state =
> MTK_DP_TRAIN_STATE_DPIDLE;
> + ret = -ETIMEDOUT;
> + }
> + }
> + break;
> +
> + case MTK_DP_TRAIN_STATE_CHECKEDID: {
> + int caps_found =
> mtk_dp_edid_parse_audio_capabilities(mtk_dp,
> + &mtk_dp->info.audio_caps);
> + mtk_dp->audio_enable = caps_found > 0;
> + if (!mtk_dp->audio_enable)
> + memset(&mtk_dp->info.audio_caps, 0,
> + sizeof(mtk_dp->info.audio_caps));
> + }
> +
> + mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING_PRE;
> + break;
> +
> + case MTK_DP_TRAIN_STATE_TRAINING_PRE:
> + mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING;
> + break;
> +
> + case MTK_DP_TRAIN_STATE_TRAINING:
> + ret = mtk_dp_train_start(mtk_dp);
> + if (!ret) {
> + mtk_dp_video_mute(mtk_dp, true);
> + mtk_dp_audio_mute(mtk_dp, true);
> + mtk_dp->train_state =
> MTK_DP_TRAIN_STATE_CHECKTIMING;
> + mtk_dp_fec_enable(mtk_dp, mtk_dp->has_fec);
> + } else if (ret != -EAGAIN) {
> + mtk_dp->train_state =
> MTK_DP_TRAIN_STATE_DPIDLE;
> + }
> +
> + ret = 0;
> + break;
> +
> + case MTK_DP_TRAIN_STATE_CHECKTIMING:
> + mtk_dp->train_state = MTK_DP_TRAIN_STATE_NORMAL;
If MTK_DP_TRAIN_STATE_CHECKTIMING does nothing,I think we should drop
state MTK_DP_TRAIN_STATE_CHECKTIMING.
> + break;
> + case MTK_DP_TRAIN_STATE_NORMAL:
> + break;
> + case MTK_DP_TRAIN_STATE_POWERSAVE:
> + break;
> + case MTK_DP_TRAIN_STATE_DPIDLE:
> + break;
> + default:
> + break;
> + }
> +
> + return ret;
> +}
> +
>
[snip]
> +
> +static void mtk_dp_video_config(struct mtk_dp *mtk_dp)
> +{
> + mtk_dp_mn_overwrite_disable(mtk_dp);
> +
> + mtk_dp_set_msa(mtk_dp);
> +
> + mtk_dp_set_color_depth(mtk_dp, mtk_dp->info.depth);
> + mtk_dp_set_color_format(mtk_dp, mtk_dp->info.format);
> +}
> +
> +static int mtk_dp_state_handler(struct mtk_dp *mtk_dp)
Always return 0, so change to void.
> +{
> + int ret = 0;
> +
> + switch (mtk_dp->state) {
> + case MTK_DP_STATE_INITIAL:
> + mtk_dp_video_mute(mtk_dp, true);
> + mtk_dp_audio_mute(mtk_dp, true);
> + mtk_dp->state = MTK_DP_STATE_IDLE;
> + break;
> +
> + case MTK_DP_STATE_IDLE:
> + if (mtk_dp->train_state == MTK_DP_TRAIN_STATE_NORMAL)
> + mtk_dp->state = MTK_DP_STATE_PREPARE;
> + break;
> +
> + case MTK_DP_STATE_PREPARE:
> + mtk_dp_video_config(mtk_dp);
> + mtk_dp_video_enable(mtk_dp, true);
> +
> + if (mtk_dp->audio_enable) {
> + mtk_dp_audio_setup(mtk_dp, &mtk_dp-
> >info.audio_caps);
> + mtk_dp_audio_mute(mtk_dp, false);
> + }
> +
> + mtk_dp->state = MTK_DP_STATE_NORMAL;
> + break;
> +
> + case MTK_DP_STATE_NORMAL:
> + if (mtk_dp->train_state != MTK_DP_TRAIN_STATE_NORMAL) {
> + mtk_dp_video_mute(mtk_dp, true);
> + mtk_dp_audio_mute(mtk_dp, true);
> + mtk_dp_sdp_stop_sending(mtk_dp);
> + mtk_dp->state = MTK_DP_STATE_IDLE;
> + }
> + break;
> +
> + default:
> + break;
> + }
> +
> + return ret;
> +}
> +
> +static void mtk_dp_init_port(struct mtk_dp *mtk_dp)
> +{
> + mtk_dp_set_idle_pattern(mtk_dp, true);
> + mtk_dp_initialize_priv_data(mtk_dp);
> +
> + mtk_dp_initialize_settings(mtk_dp);
> + mtk_dp_initialize_aux_settings(mtk_dp);
> + mtk_dp_initialize_digital_settings(mtk_dp);
> + mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3690,
> + BIT(RX_REPLY_COMPLETE_MODE_AUX_TX_P0_SHIFT),
> + RX_REPLY_COMPLETE_MODE_AUX_TX_P0_MASK);
> + mtk_dp_initialize_hpd_detect_settings(mtk_dp);
> +
> + mtk_dp_digital_sw_reset(mtk_dp);
> +}
> +
> +static irqreturn_t mtk_dp_hpd_event_thread(int hpd, void *dev)
> +{
> + struct mtk_dp *mtk_dp = dev;
> + int event;
event is useless, do drop it.
> + u8 buf[DP_RECEIVER_CAP_SIZE] = {};
> +
> + event = mtk_dp_plug_state(mtk_dp) ? connector_status_connected
> :
> + connector_status_disc
> onnected;
> +
> + if (event < 0)
Never happen, drop it.
> + return IRQ_HANDLED;
> +
> + if (mtk_dp->drm_dev) {
> + dev_info(mtk_dp->dev, "drm_helper_hpd_irq_event\n");
> + drm_helper_hpd_irq_event(mtk_dp->bridge.dev);
> + }
> +
> + if (mtk_dp->train_info.cable_state_change) {
> + mtk_dp->train_info.cable_state_change = false;
> +
> + mtk_dp->train_state = MTK_DP_TRAIN_STATE_STARTUP;
> +
> + if (!mtk_dp->train_info.cable_plugged_in ||
> + !mtk_dp_plug_state(mtk_dp)) {
> + mtk_dp_video_mute(mtk_dp, true);
> + mtk_dp_audio_mute(mtk_dp, true);
> +
> + mtk_dp_initialize_priv_data(mtk_dp);
> + mtk_dp_set_idle_pattern(mtk_dp, true);
> + if (mtk_dp->has_fec)
> + mtk_dp_fec_enable(mtk_dp, false);
> + mtk_dp_sdp_stop_sending(mtk_dp);
> +
> + mtk_dp_edid_free(mtk_dp);
> + mtk_dp_update_bits(mtk_dp,
> MTK_DP_TOP_PWR_STATE,
> + DP_PWR_STATE_BANDGAP_TPLL,
> + DP_PWR_STATE_MASK);
> + } else {
> + mtk_dp_update_bits(mtk_dp,
> MTK_DP_TOP_PWR_STATE,
> + DP_PWR_STATE_BANDGAP_TPLL_LA
> NE,
> + DP_PWR_STATE_MASK);
> + drm_dp_read_dpcd_caps(&mtk_dp->aux, buf);
> + mtk_dp->train_info.link_rate =
> + min_t(int, MTK_DP_MAX_LINK_RATE,
> + buf[DP_MAX_LINK_RATE]);
> + mtk_dp->train_info.lane_count =
> + min_t(int, MTK_DP_MAX_LANES,
> + drm_dp_max_lane_count(buf));
> + }
> + }
> +
> + if (mtk_dp->train_info.irq_status & MTK_DP_HPD_INTERRUPT) {
> + dev_info(mtk_dp->dev, "MTK_DP_HPD_INTERRUPT\n");
> + mtk_dp->train_info.irq_status &= ~MTK_DP_HPD_INTERRUPT;
> + mtk_dp_hpd_sink_event(mtk_dp);
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t mtk_dp_hpd_isr_handler(struct mtk_dp *mtk_dp)
> +{
> + bool connected;
> + u16 swirq_status = mtk_dp_swirq_get_clear(mtk_dp);
> + u8 hwirq_status = mtk_dp_hwirq_get_clear(mtk_dp);
mtk_dp_sw_irq_get_clear() and mtk_dp_hwirq_get_clear() is called once
here, so I would like to merge that two function into this function.
> + struct mtk_dp_train_info *train_info = &mtk_dp->train_info;
> +
> + train_info->irq_status |= hwirq_status | swirq_status;
> +
> + if (!train_info->irq_status)
> + return IRQ_HANDLED;
> +
Drop below algorithm, and call mtk_dp_plug_state() in
mtk_dp_hpd_event_thread(), and directly compare connected with
train_info->cable_plugged_in.
> + connected = mtk_dp_plug_state(mtk_dp);
> + if (connected || !train_info->cable_plugged_in)
> + train_info->irq_status &= ~MTK_DP_HPD_DISCONNECT;
> + else if (!connected || train_info->cable_plugged_in)
> + train_info->irq_status &= ~MTK_DP_HPD_CONNECT;
> +
> + if (!(train_info->irq_status &
> + (MTK_DP_HPD_CONNECT | MTK_DP_HPD_DISCONNECT)))
> + return IRQ_HANDLED;
> +
> + if (train_info->irq_status & MTK_DP_HPD_CONNECT) {
> + train_info->irq_status &= ~MTK_DP_HPD_CONNECT;
> + train_info->cable_plugged_in = true;
> + } else {
> + train_info->irq_status &= ~MTK_DP_HPD_DISCONNECT;
> + train_info->cable_plugged_in = false;
> + mtk_dp->train_state = MTK_DP_TRAIN_STATE_STARTUP;
> + }
> + train_info->cable_state_change = true;
> + return IRQ_WAKE_THREAD;
> +}
> +
> +static irqreturn_t mtk_dp_hpd_event(int hpd, void *dev)
> +{
> + struct mtk_dp *mtk_dp = dev;
> + u32 irq_status;
> +
> + irq_status = mtk_dp_read(mtk_dp, MTK_DP_TOP_IRQ_STATUS);
> +
> + if (!irq_status)
> + return IRQ_HANDLED;
> +
> + if (irq_status & RGS_IRQ_STATUS_TRANSMITTER)
> + return mtk_dp_hpd_isr_handler(mtk_dp);
mtk_dp_hpd_isr_handler() is called once here,
so I would like to merge
mtk_dp_hpd_isr_handler() into this function,
and change mtk_dp_hpd_event() to mtk_dp_hpd_isr_handler().
> +
> + return IRQ_HANDLED;
> +}
> +
>
[snip]
> +
> +static ssize_t mtk_dp_aux_transfer(struct drm_dp_aux *mtk_aux,
> + struct drm_dp_aux_msg *msg)
> +{
> + ssize_t err = -EAGAIN;
> + struct mtk_dp *mtk_dp;
> + bool is_read;
> + u8 request;
> + size_t accessed_bytes = 0;
> + int retry = 3, ret = 0;
> +
> + mtk_dp = container_of(mtk_aux, struct mtk_dp, aux);
> +
> + if (!mtk_dp->train_info.cable_plugged_in ||
> + mtk_dp->train_info.irq_status & MTK_DP_HPD_DISCONNECT) {
> + mtk_dp->train_state = MTK_DP_TRAIN_STATE_CHECKCAP;
> + err = -EAGAIN;
> + goto err;
> + }
> +
> + switch (msg->request) {
In intel_dp_aux_transfer() [1], it is
switch (msg->request & ~DP_AUX_I2C_MOT) {
Would that be a better statement?
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/i915/display/intel_dp_aux.c?h=v5.16-rc6#n413
> + case DP_AUX_I2C_MOT:
> + case DP_AUX_I2C_WRITE:
> + case DP_AUX_NATIVE_WRITE:
> + case DP_AUX_I2C_WRITE_STATUS_UPDATE:
> + case DP_AUX_I2C_WRITE_STATUS_UPDATE | DP_AUX_I2C_MOT:
> + request = msg->request &
> ~DP_AUX_I2C_WRITE_STATUS_UPDATE;
> + is_read = false;
> + break;
> + case DP_AUX_I2C_READ:
> + case DP_AUX_NATIVE_READ:
> + case DP_AUX_I2C_READ | DP_AUX_I2C_MOT:
> + request = msg->request;
> + is_read = true;
> + break;
> + default:
> + drm_err(mtk_aux->drm_dev, "invalid aux cmd = %d\n",
> + msg->request);
> + err = -EINVAL;
> + goto err;
> + }
> +
> + if (msg->size == 0) {
> + mtk_dp_aux_do_transfer(mtk_dp, is_read, request,
> + msg->address + accessed_bytes,
> + msg->buffer + accessed_bytes,
> 0);
> + } else {
> + while (accessed_bytes < msg->size) {
> + size_t to_access =
> + min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES,
> + msg->size - accessed_bytes);
> + retry = 3;
> + while (retry--) {
> + ret = mtk_dp_aux_do_transfer(mtk_dp,
> + is_read,
> request,
> + msg-
> >address + accessed_bytes,
> + msg-
> >buffer + accessed_bytes,
> + to_access)
> ;
> + if (ret == 0)
> + break;
> + usleep_range(50, 100);
> + }
> + if (!retry && ret) {
> + drm_info(mtk_dp->drm_dev,
> + "Failed to do AUX transfer:
> %d\n",
> + ret);
> + break;
> + }
> + accessed_bytes += to_access;
> + }
> + }
> +err:
> + if (ret) {
> + msg->reply = DP_AUX_NATIVE_REPLY_NACK |
> DP_AUX_I2C_REPLY_NACK;
> + return err;
> + }
> +
> + msg->reply = DP_AUX_NATIVE_REPLY_ACK | DP_AUX_I2C_REPLY_ACK;
> + return msg->size;
> +}
> +
>
[snip]
> +
> +static void mtk_dp_bridge_atomic_enable(struct drm_bridge *bridge,
> + struct drm_bridge_state
> *old_state)
> +{
> + struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
> + struct drm_connector_state *conn_state;
> + struct drm_crtc *crtc;
> + struct drm_crtc_state *crtc_state;
> + int ret = 0;
> + int i;
> +
> + mtk_dp->conn =
> drm_atomic_get_new_connector_for_encoder(old_state->base.state,
> + bridge-
> >encoder);
> + if (!mtk_dp->conn) {
> + drm_err(mtk_dp->drm_dev,
> + "Can't enable bridge as connector is
> missing\n");
> + return;
> + }
> +
> + mutex_lock(&mtk_dp->eld_lock);
> + memcpy(mtk_dp->connector_eld, mtk_dp->conn->eld,
> MAX_ELD_BYTES);
> + mutex_unlock(&mtk_dp->eld_lock);
> +
> + conn_state =
> + drm_atomic_get_new_connector_state(old_state-
> >base.state, mtk_dp->conn);
> + if (!conn_state) {
> + drm_err(mtk_dp->drm_dev,
> + "Can't enable bridge as connector state is
> missing\n");
> + return;
> + }
> +
> + crtc = conn_state->crtc;
> + if (!crtc) {
> + drm_err(mtk_dp->drm_dev,
> + "Can't enable bridge as connector state doesn't
> have a crtc\n");
> + return;
> + }
> +
> + crtc_state = drm_atomic_get_new_crtc_state(old_state-
> >base.state, crtc);
> + if (!crtc_state) {
> + drm_err(mtk_dp->drm_dev,
> + "Can't enable bridge as crtc state is
> missing\n");
> + return;
> + }
> +
> + mtk_dp_parse_drm_mode_timings(mtk_dp, &crtc_state-
> >adjusted_mode);
> + if (!mtk_dp_parse_capabilities(mtk_dp)) {
> + drm_err(mtk_dp->drm_dev,
> + "Can't enable bridge as nothing is plugged
> in\n");
> + return;
> + }
> +
> + /* Training */
> + for (i = 0; i < 50; i++) {
> + ret = mtk_dp_train_handler(mtk_dp);
Why do you call mtk_dp_train_handler() many times? Call
mtk_dp_train_handler() once and let all retry inside
mtk_dp_train_handler().
> + if (ret) {
> + drm_err(mtk_dp->drm_dev, "Train handler failed
> %d\n",
> + ret);
> + return;
> + }
> +
> + ret = mtk_dp_state_handler(mtk_dp);
> + if (ret) {
> + drm_err(mtk_dp->drm_dev, "State handler failed
> %d\n",
> + ret);
> + return;
> + }
> + }
> +
> + mtk_dp->enabled = true;
> + mtk_dp_update_plugged_status(mtk_dp);
> +}
> +
>
[snip]
> +
> +static int mtk_dp_probe(struct platform_device *pdev)
> +{
> + struct mtk_dp *mtk_dp;
> + struct device *dev = &pdev->dev;
> + int ret;
> + int irq_num = 0;
> +
> + mtk_dp = devm_kzalloc(dev, sizeof(*mtk_dp), GFP_KERNEL);
> + if (!mtk_dp)
> + return -ENOMEM;
> +
> + mtk_dp->dev = dev;
> +
> + irq_num = platform_get_irq(pdev, 0);
> + if (irq_num < 0) {
> + dev_err(dev, "failed to request dp irq resource\n");
> + return -EPROBE_DEFER;
return irq_num;
> + }
> +
> + mtk_dp->next_bridge = devm_drm_of_get_bridge(dev, dev->of_node,
> 1, 0);
> + if (IS_ERR(mtk_dp->next_bridge)) {
> + ret = PTR_ERR(mtk_dp->next_bridge);
> + dev_err_probe(dev, ret, "Failed to get bridge\n");
> + return ret;
> + }
> +
> + ret = mtk_dp_dt_parse(mtk_dp, pdev);
> + if (ret)
> + return ret;
> +
> + mtk_dp_aux_init(mtk_dp);
> +
> + ret = devm_request_threaded_irq(dev, irq_num, mtk_dp_hpd_event,
> + mtk_dp_hpd_event_thread,
> + IRQ_TYPE_LEVEL_HIGH,
> dev_name(dev),
> + mtk_dp);
> + if (ret) {
> + dev_err(dev, "failed to request mediatek dptx irq\n");
> + return -EPROBE_DEFER;
return ret;
> + }
> +
> + mutex_init(&mtk_dp->dp_lock);
> + mutex_init(&mtk_dp->edid_lock);
> + mutex_init(&mtk_dp->eld_lock);
> +
> + platform_set_drvdata(pdev, mtk_dp);
> +
> + mutex_init(&mtk_dp->update_plugged_status_lock);
> + ret = mtk_dp_register_audio_driver(dev);
> + if (ret) {
> + dev_err(dev, "Failed to register audio driver: %d\n",
> + ret);
> + return ret;
> + }
> +
> + mtk_dp->phy_dev = platform_device_register_data(dev, "mediatek-
> dp-phy",
> + PLATFORM_DEVID_
> AUTO,
> + &mtk_dp->regs,
> + sizeof(struct
> regmap *));
> + if (IS_ERR(mtk_dp->phy_dev)) {
> + dev_err(dev, "Failed to create device mediatek-dp-phy:
> %ld\n",
> + PTR_ERR(mtk_dp->phy_dev));
> + return PTR_ERR(mtk_dp->phy_dev);
> + }
> +
> + mtk_dp_get_calibration_data(mtk_dp);
> +
> + mtk_dp->phy = devm_phy_get(&mtk_dp->phy_dev->dev, "dp");
> + if (IS_ERR(mtk_dp->phy)) {
> + dev_err(dev, "Failed to get phy: %ld\n",
> PTR_ERR(mtk_dp->phy));
> + platform_device_unregister(mtk_dp->phy_dev);
> + return PTR_ERR(mtk_dp->phy);
> + }
> +
> + mtk_dp->bridge.funcs = &mtk_dp_bridge_funcs;
> + mtk_dp->bridge.of_node = dev->of_node;
> + mtk_dp->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
> +
> + mtk_dp->bridge.ops =
> + DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
> DRM_BRIDGE_OP_HPD;
> + drm_bridge_add(&mtk_dp->bridge);
> +
> + pm_runtime_enable(dev);
> + pm_runtime_get_sync(dev);
> +
> + return 0;
> +}
> +
>
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