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Message-ID: <20240122145608.990137-12-sashal@kernel.org>
Date: Mon, 22 Jan 2024 09:50:45 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Xin Ji <xji@...logixsemi.com>,
Robert Foss <rfoss@...nel.org>,
Sasha Levin <sashal@...nel.org>,
andrzej.hajda@...el.com,
neil.armstrong@...aro.org,
maarten.lankhorst@...ux.intel.com,
mripard@...nel.org,
tzimmermann@...e.de,
airlied@...il.com,
daniel@...ll.ch,
wenst@...omium.org,
dianders@...omium.org,
nfraprado@...labora.com,
mairacanal@...eup.net,
treapking@...omium.org,
andriy.shevchenko@...ux.intel.com,
angelogioacchino.delregno@...labora.com,
dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.7 12/88] drm/bridge: anx7625: Fix Set HPD irq detect window to 2ms
From: Xin Ji <xji@...logixsemi.com>
[ Upstream commit e3af7053de3f685c96158373bc234b2feca1f160 ]
Polling firmware HPD GPIO status, set HPD irq detect window to 2ms
after firmware HPD GPIO initial done
Signed-off-by: Xin Ji <xji@...logixsemi.com>
Reviewed-by: Robert Foss <rfoss@...nel.org>
Signed-off-by: Robert Foss <rfoss@...nel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231120091038.284825-2-xji@analogixsemi.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/gpu/drm/bridge/analogix/anx7625.c | 51 ++++++++++++++++-------
drivers/gpu/drm/bridge/analogix/anx7625.h | 4 ++
2 files changed, 40 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 8f740154707d..7afb7edc8ae3 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -1298,10 +1298,32 @@ static void anx7625_config(struct anx7625_data *ctx)
XTAL_FRQ_SEL, XTAL_FRQ_27M);
}
+static int anx7625_hpd_timer_config(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);
+
+ return ret;
+}
+
+static int anx7625_read_hpd_gpio_config_status(struct anx7625_data *ctx)
+{
+ return anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, GPIO_CTRL_2);
+}
+
static void anx7625_disable_pd_protocol(struct anx7625_data *ctx)
{
struct device *dev = ctx->dev;
- int ret;
+ int ret, val;
/* Reset main ocm */
ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client, 0x88, 0x40);
@@ -1315,6 +1337,19 @@ static void anx7625_disable_pd_protocol(struct anx7625_data *ctx)
DRM_DEV_DEBUG_DRIVER(dev, "disable PD feature fail.\n");
else
DRM_DEV_DEBUG_DRIVER(dev, "disable PD feature succeeded.\n");
+
+ /*
+ * Make sure the HPD GPIO already be configured after OCM release before
+ * setting HPD detect window register. Here we poll the status register
+ * at maximum 40ms, then config HPD irq detect window register
+ */
+ readx_poll_timeout(anx7625_read_hpd_gpio_config_status,
+ ctx, val,
+ ((val & HPD_SOURCE) || (val < 0)),
+ 2000, 2000 * 20);
+
+ /* Set HPD irq detect window to 2ms */
+ anx7625_hpd_timer_config(ctx);
}
static int anx7625_ocm_loading_check(struct anx7625_data *ctx)
@@ -1437,20 +1472,6 @@ 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 5af819611ebc..66ebee7f3d83 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -259,6 +259,10 @@
#define AP_MIPI_RX_EN BIT(5) /* 1: MIPI RX input in 0: no RX in */
#define AP_DISABLE_PD BIT(6)
#define AP_DISABLE_DISPLAY BIT(7)
+
+#define GPIO_CTRL_2 0x49
+#define HPD_SOURCE BIT(6)
+
/***************************************************************/
/* Register definition of device address 0x84 */
#define MIPI_PHY_CONTROL_3 0x03
--
2.43.0
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