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drm/bridge: anx7625: Set HPD irq detect window to 2ms

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Some panels trigger HPD irq due to noise, the HPD debounce
may be 1.8ms, exceeding the default irq detect window, ~1.4ms.
This patch set HPD irq detection window to 2ms to
tolerate the HPD noise.

Signed-off-by: Xin Ji <xji@analogixsemi.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220903130833.541463-1-xji@analogixsemi.com
This commit is contained in:
Xin Ji 2022-09-03 21:08:33 +08:00 committed by Robert Foss
parent 396369d675
commit 8e3d857c70
No known key found for this signature in database
GPG Key ID: 3EFD900F76D1D784
2 changed files with 20 additions and 0 deletions
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14
drivers/gpu/drm/bridge/analogix/anx7625.c
View File

@ -1440,6 +1440,20 @@ static void anx7625_start_dp_work(struct anx7625_data *ctx)
static int anx7625_read_hpd_status_p0(struct anx7625_data *ctx)
{
int ret;
/* Set irq detect window to 2ms */
ret = anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
HPD_DET_TIMER_BIT0_7, HPD_TIME & 0xFF);
ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
HPD_DET_TIMER_BIT8_15,
(HPD_TIME >> 8) & 0xFF);
ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
HPD_DET_TIMER_BIT16_23,
(HPD_TIME >> 16) & 0xFF);
if (ret < 0)
return ret;
return anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, SYSTEM_STSTUS);
}

6
drivers/gpu/drm/bridge/analogix/anx7625.h
View File

@ -132,6 +132,12 @@
#define I2S_SLAVE_MODE 0x08
#define AUDIO_LAYOUT 0x01
#define HPD_DET_TIMER_BIT0_7 0xea
#define HPD_DET_TIMER_BIT8_15 0xeb
#define HPD_DET_TIMER_BIT16_23 0xec
/* HPD debounce time 2ms for 27M clock */
#define HPD_TIME 54000
#define AUDIO_CONTROL_REGISTER 0xe6
#define TDM_TIMING_MODE 0x08