Re: [PATCH v12] drm/bridge: it6505: fix hibernate to resume no display issue

From: Robert Foss
Date: Tue May 21 2024 - 08:47:12 EST

Next message: Andrew Lunn: "Re: [PATCH net-next v19 01/13] rtase: Add pci table supported in this module"
Previous message: Romain Gantois: "[PATCH net] net: ti: icssg_prueth: Fix NULL pointer dereference in prueth_probe()"
In reply to: kuro: "[PATCH v12] drm/bridge: it6505: fix hibernate to resume no display issue"
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Hey,

Thanks for spinning another few revisions.

On Tue, May 21, 2024 at 9:51 AM kuro <kuro.chung@xxxxxxxxxx> wrote:
>
> From: Kuro Chung <kuro.chung@xxxxxxxxxx>
>
> When the system power resumes, the TTL input of IT6505 may experience
> some noise before the video signal stabilizes, necessitating a video
> reset. This patch is implemented to prevent a loop of video error
> interrupts, which can occur when a video reset in the video FIFO error
> interrupt triggers another such interrupt. The patch processes the SCDT
> and FIFO error interrupts simultaneously and ignores any video FIFO
> error interrupts caused by a video reset.
>
> Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
> Signed-off-by: Kuro Chung <kuro.chung@xxxxxxxxxx>
> Signed-off-by: Hermes Wu <hermes.wu@xxxxxxxxxx>
>
> ---
> V1->V3: update MAINTAINERS mail list
> V3->V4: remove function it6505_irq_video_fifo_error,it6505_irq_io_latch_fifo_overflow
> V4->V5: customer feedback again, update again, kernel build pass
> V5->V6: remove unrelated patch change, split into another patch
> V6->V7: modify code 0x02 to TX_FIFO_RESET by macro define
> V7->V8: fix merge conflict, change mail from 'cc' to 'to'
> V8->V9: modify patch description, patch summary
> V9->V10: modify patch summary, add Fixes
> V10->V11: modify patch description, add Signed-off-by
> V11->V12: moidfy patch description.
>
> ---
> drivers/gpu/drm/bridge/ite-it6505.c | 73 +++++++++++++++++++----------
> 1 file changed, 49 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
> index 469157341f3ab..5703fcf4b7b00 100644
> --- a/drivers/gpu/drm/bridge/ite-it6505.c
> +++ b/drivers/gpu/drm/bridge/ite-it6505.c
> @@ -1307,9 +1307,15 @@ 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, TX_FIFO_RESET);
> + 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);
> }
>
> @@ -2245,12 +2251,11 @@ 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);
> }
>
> - it6505_dump(it6505);
> }
>
> static void it6505_plugged_status_to_codec(struct it6505 *it6505)
> @@ -2471,31 +2476,53 @@ 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)
> {
> - struct device *dev = it6505->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_video_handler(struct it6505 *it6505, const int *int_status)
> {
> struct device *dev = it6505->dev;
> + int reg_0d, reg_int03;
>
> - 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);
> -}
> + /*
> + * When video SCDT change with video not stable,
> + * Or video FIFO error, need video reset
> + */
>
> -static bool it6505_test_bit(unsigned int bit, const unsigned int *addr)
> -{
> - return 1 & (addr[bit / BITS_PER_BYTE] >> (bit % BITS_PER_BYTE));
> + 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)
> @@ -2508,15 +2535,12 @@ 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;
>
> @@ -2546,6 +2570,7 @@ static irqreturn_t it6505_int_threaded_handler(int unused, void *data)
> 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);
> --
> 2.25.1
>

This patch has a few checkpatch --strict warnings, do you mind fixing
those and then we can merge this patch?

linux/scripts/checkpatch.pl --strict --no-signoff --git 'HEAD~0'

Rob.

Next message: Andrew Lunn: "Re: [PATCH net-next v19 01/13] rtase: Add pci table supported in this module"
Previous message: Romain Gantois: "[PATCH net] net: ti: icssg_prueth: Fix NULL pointer dereference in prueth_probe()"
In reply to: kuro: "[PATCH v12] drm/bridge: it6505: fix hibernate to resume no display issue"
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