Re: [PATCH v5 1/1] UPSTREAM: drm/bridge: it6505: fix hibernate to resume no display issue

From: Dmitry Baryshkov
Date: Fri Apr 19 2024 - 07:25:00 EST

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In reply to: kuro: "[PATCH v5 1/1] UPSTREAM: drm/bridge: it6505: fix hibernate to resume no display issue"
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On Fri, Apr 19, 2024 at 03:38:07PM +0800, kuro wrote:
> From: Kuro <kuro.chung@xxxxxxxxxx>
>
> ITE added a FIFO reset bit for input video. When system power resume,
> the TTL input of it6505 may get some noise before video signal stable
> and the hardware function reset is required.
> But the input FIFO reset will also trigger error interrupts of output module rising.
> Thus, it6505 have to wait a period can clear those expected error interrupts
> caused by manual hardware reset in one interrupt handler calling to avoid interrupt looping.
>
> Signed-off-by: Kuro Chung <kuro.chung@xxxxxxxxxxxxxxxxxxxxxxxxxxx>

Generic, please drop 'UPSTREAM' part of the subject. Do not use such
tags for sending patches upstream.

>
> ---
> drivers/gpu/drm/bridge/ite-it6505.c | 181 +++++++++++++++++++---------
> 1 file changed, 124 insertions(+), 57 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
> index b53da9bb65a16..4fd693b4b68ca 100644
> --- a/drivers/gpu/drm/bridge/ite-it6505.c
> +++ b/drivers/gpu/drm/bridge/ite-it6505.c
> @@ -802,8 +802,8 @@ static void it6505_int_mask_enable(struct it6505 *it6505)
> BIT(INT_RECEIVE_HPD_IRQ) | BIT(INT_SCDT_CHANGE) |
> BIT(INT_HDCP_FAIL) | BIT(INT_HDCP_DONE));
>
> - it6505_write(it6505, INT_MASK_02, BIT(INT_AUX_CMD_FAIL) |
> - BIT(INT_HDCP_KSV_CHECK) | BIT(INT_AUDIO_FIFO_ERROR));
> + it6505_write(it6505, INT_MASK_02, BIT(INT_HDCP_KSV_CHECK) |
> + BIT(INT_AUDIO_FIFO_ERROR));
>
> it6505_write(it6505, INT_MASK_03, BIT(INT_LINK_TRAIN_FAIL) |
> BIT(INT_VID_FIFO_ERROR) | BIT(INT_IO_LATCH_FIFO_OVERFLOW));
> @@ -1317,10 +1317,17 @@ static void it6505_video_reset(struct it6505 *it6505)
> it6505_link_reset_step_train(it6505);
> it6505_set_bits(it6505, REG_DATA_MUTE_CTRL, EN_VID_MUTE, EN_VID_MUTE);
> it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_VID_CTRL_PKT, 0x00);
> - it6505_set_bits(it6505, REG_RESET_CTRL, VIDEO_RESET, VIDEO_RESET);
> +
> + it6505_set_bits(it6505, REG_VID_BUS_CTRL1, TX_FIFO_RESET, 0x02);
> + it6505_set_bits(it6505, REG_VID_BUS_CTRL1, TX_FIFO_RESET, 0x00);
> +
> it6505_set_bits(it6505, REG_501_FIFO_CTRL, RST_501_FIFO, RST_501_FIFO);
> it6505_set_bits(it6505, REG_501_FIFO_CTRL, RST_501_FIFO, 0x00);
> +
> + it6505_set_bits(it6505, REG_RESET_CTRL, VIDEO_RESET, VIDEO_RESET);
> + usleep_range(1000, 2000);
> it6505_set_bits(it6505, REG_RESET_CTRL, VIDEO_RESET, 0x00);
> +

Extra empty line.

> }
>
> static void it6505_update_video_parameter(struct it6505 *it6505,
> @@ -1861,16 +1868,29 @@ static void it6505_reset_hdcp(struct it6505 *it6505)
> /* Disable CP_Desired */
> it6505_set_bits(it6505, REG_HDCP_CTRL1, HDCP_CP_ENABLE, 0x00);
> it6505_set_bits(it6505, REG_RESET_CTRL, HDCP_RESET, HDCP_RESET);
> + it6505_set_bits(it6505, REG_RESET_CTRL, HDCP_RESET, 0x00);
> }
>
> static void it6505_start_hdcp(struct it6505 *it6505)
> {
> struct device *dev = &it6505->client->dev;
>
> - DRM_DEV_DEBUG_DRIVER(dev, "start");
> - it6505_reset_hdcp(it6505);
> - queue_delayed_work(system_wq, &it6505->hdcp_work,
> - msecs_to_jiffies(2400));
> + /*
> + * If video not stable, no need turn on HDCP
> + * After video stable
> + * SCDT IRQ ->Link Training-> HDCP
> + */
> + if (it6505_get_video_status(it6505)) {

Won't this be easier:

if (!it6505_get_video_status(it6505)) {
DRM_DEV_DEBUG_DRIVER(dev, "Video not ready for HDCP");
return;
}

> + DRM_DEV_DEBUG_DRIVER(dev, "start");
> + it6505_reset_hdcp(it6505);
> +
> + queue_delayed_work(system_wq, &it6505->hdcp_work,
> + msecs_to_jiffies(2400));
> +
> + return;
> + }
> +
> + DRM_DEV_DEBUG_DRIVER(dev, "Video not ready for HDCP");
> }
>
> static void it6505_stop_hdcp(struct it6505 *it6505)
> @@ -2249,12 +2269,11 @@ static void it6505_link_training_work(struct work_struct *work)
> if (ret) {
> it6505->auto_train_retry = AUTO_TRAIN_RETRY;
> it6505_link_train_ok(it6505);
> - return;
> } else {
> it6505->auto_train_retry--;
> + it6505_dump(it6505);

This seems like an unrelated change. Please split this to a separate
commit.

> }
>
> - it6505_dump(it6505);
> }
>
> static void it6505_plugged_status_to_codec(struct it6505 *it6505)
> @@ -2309,14 +2328,24 @@ static int it6505_process_hpd_irq(struct it6505 *it6505)
> DRM_DEV_DEBUG_DRIVER(dev, "dp_irq_vector = 0x%02x", dp_irq_vector);
>
> if (dp_irq_vector & DP_CP_IRQ) {
> - it6505_set_bits(it6505, REG_HDCP_TRIGGER, HDCP_TRIGGER_CPIRQ,
> - HDCP_TRIGGER_CPIRQ);
> +
> + DRM_DEV_DEBUG_DRIVER(dev, "DP_CP_IRQ :hdcp_status = 0x%02x", it6505->hdcp_status);
> +
> + /*
> + * Some TYPE-C devces trigger CP_IRQ when system resume
> + * And IT6505 HDCP is in idle state
> + * No Need trigger 6505 HDCP control.
> + */
> + if (it6505->hdcp_status == HDCP_AUTH_GOING)
> + it6505_set_bits(it6505, REG_HDCP_TRIGGER, HDCP_TRIGGER_CPIRQ,
> + HDCP_TRIGGER_CPIRQ);
>
> bstatus = it6505_dpcd_read(it6505, DP_AUX_HDCP_BSTATUS);
> if (bstatus < 0)
> return bstatus;
>
> DRM_DEV_DEBUG_DRIVER(dev, "Bstatus = 0x%02x", bstatus);
> +

Separate commit too.

> }
>
> ret = drm_dp_dpcd_read_link_status(&it6505->aux, link_status);
> @@ -2328,9 +2357,24 @@ static int it6505_process_hpd_irq(struct it6505 *it6505)
> DRM_DEV_DEBUG_DRIVER(dev, "link status = 0x%*ph",
> (int)ARRAY_SIZE(link_status), link_status);
>
> - if (!drm_dp_channel_eq_ok(link_status, it6505->lane_count)) {
> + /*
> + * when recive HPD_IRQ signal from DP SINK
> + * No need to process link status when DP link is not in ready state
> + */
> + if ((it6505->link_state == LINK_OK) &&
> + (!drm_dp_channel_eq_ok(link_status, it6505->lane_count))) {

Please indent to the opening bracket.

> +
> + if (it6505->hdcp_desired)
> + it6505_stop_hdcp(it6505);
> +
> it6505->auto_train_retry = AUTO_TRAIN_RETRY;
> - it6505_video_reset(it6505);
> +
> + /*
> + * Link symble lost , need restart trainig
> + * if no video, wait for video SCDT IRQ
> + */
> + if (it6505_get_video_status(it6505))
> + schedule_work(&it6505->link_works);
> }
>
> return 0;
> @@ -2408,21 +2452,6 @@ static void it6505_irq_hpd_irq(struct it6505 *it6505)
> DRM_DEV_DEBUG_DRIVER(dev, "process hpd_irq fail!");
> }
>
> -static void it6505_irq_scdt(struct it6505 *it6505)
> -{
> - struct device *dev = &it6505->client->dev;
> - bool data;
> -
> - data = it6505_get_video_status(it6505);
> - DRM_DEV_DEBUG_DRIVER(dev, "video stable change interrupt, %s",
> - data ? "stable" : "unstable");
> - it6505_calc_video_info(it6505);
> - it6505_link_reset_step_train(it6505);
> -
> - if (data)
> - schedule_work(&it6505->link_works);
> -}
> -

It looks now that you have a separate set of changes here, realted to
IRQ processing. Please split HDCP fixes and the IRQ-related changes.

> static void it6505_irq_hdcp_done(struct it6505 *it6505)
> {
> struct device *dev = &it6505->client->dev;
> @@ -2442,13 +2471,6 @@ static void it6505_irq_hdcp_fail(struct it6505 *it6505)
> it6505_start_hdcp(it6505);
> }
>
> -static void it6505_irq_aux_cmd_fail(struct it6505 *it6505)
> -{
> - struct device *dev = &it6505->client->dev;
> -
> - DRM_DEV_DEBUG_DRIVER(dev, "AUX PC Request Fail Interrupt");
> -}
> -
> static void it6505_irq_hdcp_ksv_check(struct it6505 *it6505)
> {
> struct device *dev = &it6505->client->dev;
> @@ -2475,31 +2497,69 @@ static void it6505_irq_link_train_fail(struct it6505 *it6505)
> schedule_work(&it6505->link_works);
> }
>
> -static void it6505_irq_video_fifo_error(struct it6505 *it6505)
> +static bool it6505_test_bit(unsigned int bit, const unsigned int *addr)

Any reason for not using the existing test_bit() ?

> {
> - struct device *dev = &it6505->client->dev;
> -
> - DRM_DEV_DEBUG_DRIVER(dev, "video fifo overflow interrupt");
> - it6505->auto_train_retry = AUTO_TRAIN_RETRY;
> - flush_work(&it6505->link_works);
> - it6505_stop_hdcp(it6505);
> - it6505_video_reset(it6505);
> + return 1 & (addr[bit / BITS_PER_BYTE] >> (bit % BITS_PER_BYTE));
> }
>
> -static void it6505_irq_io_latch_fifo_overflow(struct it6505 *it6505)
> +static void it6505_irq_scdt(struct it6505 *it6505)

Please refrain from moving the functions in the same commit as changing
them. It is hard to check what happened with it6505_irq_scdt().

> {
> struct device *dev = &it6505->client->dev;
> + bool data;
>
> - DRM_DEV_DEBUG_DRIVER(dev, "IO latch fifo overflow interrupt");
> - it6505->auto_train_retry = AUTO_TRAIN_RETRY;
> - flush_work(&it6505->link_works);
> - it6505_stop_hdcp(it6505);
> - it6505_video_reset(it6505);
> + data = it6505_get_video_status(it6505);
> + DRM_DEV_DEBUG_DRIVER(dev, "video stable change interrupt, %s", data ? "stable" : "unstable");
> +
> + it6505_calc_video_info(it6505);
> + it6505_link_reset_step_train(it6505);
> +
> + if (data)
> + schedule_work(&it6505->link_works);
> }
>
> -static bool it6505_test_bit(unsigned int bit, const unsigned int *addr)
> +
> +static void it6505_irq_video_handler(struct it6505 *it6505, const int *int_status)
> {
> - return 1 & (addr[bit / BITS_PER_BYTE] >> (bit % BITS_PER_BYTE));
> + struct device *dev = &it6505->client->dev;
> + int reg_0d, reg_int03;
> +
> + /*
> + * When video SCDT change with video not stable,
> + * Or video FIFO error, need video reset
> + */
> +
> + if ((!it6505_get_video_status(it6505) &&
> + (it6505_test_bit(INT_SCDT_CHANGE, (unsigned int *) int_status))) ||
> + (it6505_test_bit(BIT_INT_IO_FIFO_OVERFLOW, (unsigned int *) int_status)) ||
> + (it6505_test_bit(BIT_INT_VID_FIFO_ERROR, (unsigned int *) int_status))) {
> +
> + it6505->auto_train_retry = AUTO_TRAIN_RETRY;
> + flush_work(&it6505->link_works);
> + it6505_stop_hdcp(it6505);
> + it6505_video_reset(it6505);
> +
> + usleep_range(10000, 11000);
> +
> + /*
> + * Clear FIFO error IRQ to prevent fifo error -> reset loop
> + * HW will trigger SCDT change IRQ again when video stable
> + */
> +
> + reg_int03 = it6505_read(it6505, INT_STATUS_03);
> + reg_0d = it6505_read(it6505, REG_SYSTEM_STS);
> +
> + reg_int03 &= (BIT(INT_VID_FIFO_ERROR) | BIT(INT_IO_LATCH_FIFO_OVERFLOW));
> + it6505_write(it6505, INT_STATUS_03, reg_int03);
> +
> + DRM_DEV_DEBUG_DRIVER(dev, "reg08 = 0x%02x", reg_int03);
> + DRM_DEV_DEBUG_DRIVER(dev, "reg0D = 0x%02x", reg_0d);
> +
> + return;
> + }
> +
> +
> + if (it6505_test_bit(INT_SCDT_CHANGE, (unsigned int *) int_status))
> + it6505_irq_scdt(it6505);
> }
>
> static irqreturn_t it6505_int_threaded_handler(int unused, void *data)
> @@ -2512,15 +2572,11 @@ static irqreturn_t it6505_int_threaded_handler(int unused, void *data)
> } irq_vec[] = {
> { BIT_INT_HPD, it6505_irq_hpd },
> { BIT_INT_HPD_IRQ, it6505_irq_hpd_irq },
> - { BIT_INT_SCDT, it6505_irq_scdt },
> { BIT_INT_HDCP_FAIL, it6505_irq_hdcp_fail },
> { BIT_INT_HDCP_DONE, it6505_irq_hdcp_done },
> - { BIT_INT_AUX_CMD_FAIL, it6505_irq_aux_cmd_fail },
> { BIT_INT_HDCP_KSV_CHECK, it6505_irq_hdcp_ksv_check },
> { BIT_INT_AUDIO_FIFO_ERROR, it6505_irq_audio_fifo_error },
> { BIT_INT_LINK_TRAIN_FAIL, it6505_irq_link_train_fail },
> - { BIT_INT_VID_FIFO_ERROR, it6505_irq_video_fifo_error },
> - { BIT_INT_IO_FIFO_OVERFLOW, it6505_irq_io_latch_fifo_overflow },
> };
> int int_status[3], i;
>
> @@ -2546,10 +2602,13 @@ static irqreturn_t it6505_int_threaded_handler(int unused, void *data)
> irq_vec[0].handler(it6505);
>
> if (it6505->hpd_state) {
> +
> for (i = 1; i < ARRAY_SIZE(irq_vec); i++) {
> if (it6505_test_bit(irq_vec[i].bit, (unsigned int *)int_status))
> irq_vec[i].handler(it6505);
> }
> +
> + it6505_irq_video_handler(it6505, (unsigned int *) int_status);
> }
>
> pm_runtime_put_sync(dev);
> @@ -3072,9 +3131,17 @@ static void it6505_bridge_atomic_disable(struct drm_bridge *bridge,
> DRM_DEV_DEBUG_DRIVER(dev, "start");
>
> if (it6505->powered) {
> - it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
> - DP_SET_POWER_D3);
> +
> it6505_video_disable(it6505);
> +
> + /*
> + * After Set link video mute,
> + * wait 20ms before send D3 to DP sink
> + */
> + usleep_range(20000, 25000);

Separate commit.

> +
> + it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
> + DP_SET_POWER_D3);
> }
> }
>
> --
> 2.25.1
>

--
With best wishes
Dmitry

Next message: Thierry Reding: "Re: [PATCH 0/4] gpu: Convert to platform remove callback returning void"
Previous message: Will Deacon: "Re: [PATCH 1/4] KVM: delete .change_pte MMU notifier callback"
In reply to: kuro: "[PATCH v5 1/1] UPSTREAM: drm/bridge: it6505: fix hibernate to resume no display issue"
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