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| author | Xin Ji <xji@analogixsemi.com> | 2022-09-03 21:08:33 +0800 |
|---|---|---|
| committer | Robert Foss <robert.foss@linaro.org> | 2022-09-06 14:09:01 +0200 |
| commit | 8e3d857c70dd317cb71301d9b49f0506ce409a1e (patch) | |
| tree | 18248441d57b074ed20367dcb2e0206c7fb24ad7 | |
| parent | 396369d6754993e40f1c84b2e22e40e92dfa4c49 (diff) | |
| download | linux-8e3d857c70dd317cb71301d9b49f0506ce409a1e.tar.gz | |
drm/bridge: anx7625: Set HPD irq detect window to 2ms
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
| -rw-r--r-- | drivers/gpu/drm/bridge/analogix/anx7625.c | 14 | ||||
| -rw-r--r-- | drivers/gpu/drm/bridge/analogix/anx7625.h | 6 |
2 files changed, 20 insertions, 0 deletions
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 |