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@xxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/bridge/analogix/anx7625.c | 14 ++++++++++++++
drivers/gpu/drm/bridge/analogix/anx7625.h | 6 ++++++
2 files changed, 20 insertions(+)
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index c74b5df4cade..0c323b5a1c99 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -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);
}
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
index e257a84db962..14f33d6be289 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -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
--
2.25.1
