[PATCH 1/7] drm/msm/mdp4: Drop unused GPIO include

[PATCH 1/7] drm/msm/mdp4: Drop unused GPIO include

[Linus Walleij]

This file is not using any symbols from <linux/gpio.h> so just
drop this include.

Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c b/drivers/gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c
index 5368e621999c..753579914d0c 100644
--- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c
+++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c
@@ -16,8 +16,6 @@
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <linux/gpio.h>
-
 #include "mdp4_kms.h"
 
 struct mdp4_lvds_connector {
-- 
2.20.1

[PATCH 2/7] drm/msm/dsi: Drop unused GPIO includes

[Linus Walleij]

This DSI driver uses the new descriptor API so these old
GPIO API includes are surplus.

Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/gpu/drm/msm/dsi/dsi_host.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 610183db1daf..d44bad13cbaf 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -14,11 +14,9 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/err.h>
-#include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/of_device.h>
-#include <linux/of_gpio.h>
 #include <linux/of_irq.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/of_graph.h>
-- 
2.20.1

[PATCH 3/7] drm/msm/dpu: Drop unused GPIO code

[Linus Walleij]

The DPU has some kind of idea that it wants to be able to
bring up power using GPIO lines. The struct dss_gpio is however
completely unused and should this be done, it should be done
using the GPIO descriptor framework rather than this API
which relies on the global GPIO numberspace. Delete this
code before anyone hurt themselves.

The inclusion of <linux/gpio.h> was abused to get some OF
and IRQ headers implicitly included into the DPU utilities,
make these includes explicit and push them down into the actual
implementation.

Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.c | 1 +
 drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.h | 9 ---------
 drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c    | 4 ++++
 3 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.c
index 78833c2c27f8..78f04147839f 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.c
@@ -15,6 +15,7 @@
 #include <linux/clk/clk-conf.h>
 #include <linux/err.h>
 #include <linux/delay.h>
+#include <linux/of.h>
 
 #include <drm/drm_print.h>
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.h
index bc07381d7429..a0498c7bd677 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.h
@@ -13,7 +13,6 @@
 #ifndef __DPU_IO_UTIL_H__
 #define __DPU_IO_UTIL_H__
 
-#include <linux/gpio.h>
 #include <linux/platform_device.h>
 #include <linux/types.h>
 
@@ -22,12 +21,6 @@
 #define DEV_WARN(fmt, args...)  pr_warn(fmt, ##args)
 #define DEV_ERR(fmt, args...)   pr_err(fmt, ##args)
 
-struct dss_gpio {
-	unsigned int gpio;
-	unsigned int value;
-	char gpio_name[32];
-};
-
 enum dss_clk_type {
 	DSS_CLK_AHB, /* no set rate. rate controlled through rpm */
 	DSS_CLK_PCLK,
@@ -42,8 +35,6 @@ struct dss_clk {
 };
 
 struct dss_module_power {
-	unsigned int num_gpio;
-	struct dss_gpio *gpio_config;
 	unsigned int num_clk;
 	struct dss_clk *clk_config;
 };
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
index 7316b4ab1b85..9baabadc62bb 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
@@ -3,6 +3,10 @@
  * Copyright (c) 2018, The Linux Foundation
  */
 
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqdesc.h>
+#include <linux/irqchip/chained_irq.h>
 #include "dpu_kms.h"
 
 #define to_dpu_mdss(x) container_of(x, struct dpu_mdss, base)
-- 
2.20.1

[PATCH 4/7] gpio: of: Support some legacy Qualcomm HDMI bindings

[Linus Walleij]

Insteaf of the MSM DRM code going around and inspecting the
device tree nodes by itself to find "qcom,misc" GPIO phandles,
we add a quirk to the core so that if "qcom,misc-gpios" and
"qcom,misc-gpio" isn't found, we try to find just
"qcom,misc" as a last resort. Provide an explicit whitelist
for those GPIOs.

Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
Rob/Sean: if the approach is overall OK I will merge this
one patch already for v5.3 so the rest can be queued for
v5.4 later.
---
 drivers/gpio/gpiolib-of.c | 43 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index aec7bd86ae7e..c927eaf6c88f 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -286,6 +286,45 @@ static struct gpio_desc *of_find_regulator_gpio(struct device *dev, const char *
 	return desc;
 }
 
+/*
+ * Some non-standard Qualcomm HDMI GPIOs need to be supported as they exist
+ * in random old device trees out there.
+ */
+static struct gpio_desc *of_find_hdmi_gpio(struct device *dev,
+					   const char *con_id,
+					   enum of_gpio_flags *of_flags)
+{
+	/*
+	 * These are the connection IDs we accept as legacy GPIO phandles.
+	 * If we get here, the same prefix ending with "-gpio" and "-gpios"
+	 * has already been tried so now we finally try with no suffix.
+	 */
+	const char *whitelist[] = {
+		"qcom,hdmi-tx-ddc-clk",
+		"qcom,hdmi-tx-ddc-data",
+		"qcom,hdmi-tx-hpd",
+		"qcom,hdmi-tx-mux-en",
+		"qcom,hdmi-tx-mux-sel",
+		"qcom,hdmi-tx-mux-lpm",
+	};
+	struct device_node *np = dev->of_node;
+	struct gpio_desc *desc;
+	int i;
+
+	if (!IS_ENABLED(CONFIG_DRM_MSM))
+		return ERR_PTR(-ENOENT);
+
+	if (!con_id)
+		return ERR_PTR(-ENOENT);
+
+	i = match_string(whitelist, ARRAY_SIZE(whitelist), con_id);
+	if (i < 0)
+		return ERR_PTR(-ENOENT);
+
+	desc = of_get_named_gpiod_flags(np, con_id, 0, of_flags);
+	return desc;
+}
+
 struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
 			       unsigned int idx, unsigned long *flags)
 {
@@ -330,6 +369,10 @@ struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
 	if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
 		desc = of_find_regulator_gpio(dev, con_id, &of_flags);
 
+	/* Special handling for HDMI GPIOs if used */
+	if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
+		desc = of_find_hdmi_gpio(dev, con_id, &of_flags);
+
 	if (IS_ERR(desc))
 		return desc;
 
-- 
2.20.1

[PATCH 5/7] drm/msm/hdmi: Convert to use GPIO descriptors

[Linus Walleij]

This switches the MSM HDMI code to use GPIO descriptors.
Normally we would fetch the GPIOs from the device with the
flags GPIOD_IN or GPIOD_OUT_[LOW|HIGH] to set up the lines
immediately, but since the code seems eager to actively
drive the lines high/low when turning HDMI on and off, we
just fetch the GPIOs as-is and keep the code explicitly
driving them.

The old code would try legacy bindings (GPIOs without any
"-gpios" suffix) but this has been moved to the gpiolib
as a quirk by the previous patch.

Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/gpu/drm/msm/hdmi/hdmi.c           | 66 +++++++++++------------
 drivers/gpu/drm/msm/hdmi/hdmi.h           |  4 +-
 drivers/gpu/drm/msm/hdmi/hdmi_connector.c | 42 +++++----------
 3 files changed, 45 insertions(+), 67 deletions(-)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
index e247d6942a49..c8e8268c76e2 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -436,38 +436,6 @@ static const struct {
 	{ "qcom,hdmi-tx-mux-lpm", true, 1, "HDMI_MUX_LPM" },
 };
 
-static int msm_hdmi_get_gpio(struct device_node *of_node, const char *name)
-{
-	int gpio;
-
-	/* try with the gpio names as in the table (downstream bindings) */
-	gpio = of_get_named_gpio(of_node, name, 0);
-	if (gpio < 0) {
-		char name2[32];
-
-		/* try with the gpio names as in the upstream bindings */
-		snprintf(name2, sizeof(name2), "%s-gpios", name);
-		gpio = of_get_named_gpio(of_node, name2, 0);
-		if (gpio < 0) {
-			char name3[32];
-
-			/*
-			 * try again after stripping out the "qcom,hdmi-tx"
-			 * prefix. This is mainly to match "hpd-gpios" used
-			 * in the upstream bindings
-			 */
-			if (sscanf(name2, "qcom,hdmi-tx-%s", name3))
-				gpio = of_get_named_gpio(of_node, name3, 0);
-		}
-
-		if (gpio < 0) {
-			DBG("failed to get gpio: %s (%d)", name, gpio);
-			gpio = -1;
-		}
-	}
-	return gpio;
-}
-
 /*
  * HDMI audio codec callbacks
  */
@@ -593,11 +561,39 @@ static int msm_hdmi_bind(struct device *dev, struct device *master, void *data)
 	hdmi_cfg->qfprom_mmio_name = "qfprom_physical";
 
 	for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
-		hdmi_cfg->gpios[i].num = msm_hdmi_get_gpio(of_node,
-						msm_hdmi_gpio_pdata[i].name);
+		const char *name = msm_hdmi_gpio_pdata[i].name;
+		struct gpio_desc *gpiod;
+
+		/*
+		 * We are fetching the GPIO lines "as is" since the connector
+		 * code is enabling and disabling the lines. Until that point
+		 * the power-on default value will be kept.
+		 */
+		gpiod = devm_gpiod_get_optional(dev, name, GPIOD_ASIS);
+		/* This will catch e.g. -PROBE_DEFER */
+		if (IS_ERR(gpiod))
+			return PTR_ERR(gpiod);
+		if (!gpiod) {
+			/* Try a second time, stripping down the name */
+			char name3[32];
+
+			/*
+			 * Try again after stripping out the "qcom,hdmi-tx"
+			 * prefix. This is mainly to match "hpd-gpios" used
+			 * in the upstream bindings.
+			 */
+			if (sscanf(name, "qcom,hdmi-tx-%s", name3))
+				gpiod = devm_gpiod_get_optional(dev, name3, GPIOD_ASIS);
+			if (IS_ERR(gpiod))
+				return PTR_ERR(gpiod);
+			if (!gpiod)
+				DBG("failed to get gpio: %s", name);
+		}
+		hdmi_cfg->gpios[i].gpiod = gpiod;
+		if (gpiod)
+			gpiod_set_consumer_name(gpiod, msm_hdmi_gpio_pdata[i].label);
 		hdmi_cfg->gpios[i].output = msm_hdmi_gpio_pdata[i].output;
 		hdmi_cfg->gpios[i].value = msm_hdmi_gpio_pdata[i].value;
-		hdmi_cfg->gpios[i].label = msm_hdmi_gpio_pdata[i].label;
 	}
 
 	dev->platform_data = hdmi_cfg;
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.h b/drivers/gpu/drm/msm/hdmi/hdmi.h
index 5c5df6ab2a57..3ef956e8de71 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.h
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.h
@@ -22,6 +22,7 @@
 #include <linux/clk.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
+#include <linux/gpio/consumer.h>
 #include <linux/hdmi.h>
 
 #include "msm_drv.h"
@@ -33,10 +34,9 @@ struct hdmi_phy;
 struct hdmi_platform_config;
 
 struct hdmi_gpio_data {
-	int num;
+	struct gpio_desc *gpiod;
 	bool output;
 	int value;
-	const char *label;
 };
 
 struct hdmi_audio {
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
index a6eeab2c4dc3..c4e9f6d7960f 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
@@ -15,7 +15,7 @@
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/pinctrl/consumer.h>
 
 #include "msm_kms.h"
@@ -79,30 +79,21 @@ static void msm_hdmi_phy_reset(struct hdmi *hdmi)
 
 static int gpio_config(struct hdmi *hdmi, bool on)
 {
-	struct device *dev = &hdmi->pdev->dev;
 	const struct hdmi_platform_config *config = hdmi->config;
-	int ret, i;
+	int i;
 
 	if (on) {
 		for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
 			struct hdmi_gpio_data gpio = config->gpios[i];
 
-			if (gpio.num != -1) {
-				ret = gpio_request(gpio.num, gpio.label);
-				if (ret) {
-					DRM_DEV_ERROR(dev,
-						"'%s'(%d) gpio_request failed: %d\n",
-						gpio.label, gpio.num, ret);
-					goto err;
-				}
-
+			if (gpio.gpiod) {
 				if (gpio.output) {
-					gpio_direction_output(gpio.num,
-							      gpio.value);
+					gpiod_direction_output(gpio.gpiod,
+							       gpio.value);
 				} else {
-					gpio_direction_input(gpio.num);
-					gpio_set_value_cansleep(gpio.num,
-								gpio.value);
+					gpiod_direction_input(gpio.gpiod);
+					gpiod_set_value_cansleep(gpio.gpiod,
+								 gpio.value);
 				}
 			}
 		}
@@ -112,29 +103,20 @@ static int gpio_config(struct hdmi *hdmi, bool on)
 		for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
 			struct hdmi_gpio_data gpio = config->gpios[i];
 
-			if (gpio.num == -1)
+			if (!gpio.gpiod)
 				continue;
 
 			if (gpio.output) {
 				int value = gpio.value ? 0 : 1;
 
-				gpio_set_value_cansleep(gpio.num, value);
+				gpiod_set_value_cansleep(gpio.gpiod, value);
 			}
-
-			gpio_free(gpio.num);
 		};
 
 		DBG("gpio off");
 	}
 
 	return 0;
-err:
-	while (i--) {
-		if (config->gpios[i].num != -1)
-			gpio_free(config->gpios[i].num);
-	}
-
-	return ret;
 }
 
 static void enable_hpd_clocks(struct hdmi *hdmi, bool enable)
@@ -322,7 +304,7 @@ static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
 	const struct hdmi_platform_config *config = hdmi->config;
 	struct hdmi_gpio_data hpd_gpio = config->gpios[HPD_GPIO_INDEX];
 
-	return gpio_get_value(hpd_gpio.num) ?
+	return gpiod_get_value(hpd_gpio.gpiod) ?
 			connector_status_connected :
 			connector_status_disconnected;
 }
@@ -341,7 +323,7 @@ static enum drm_connector_status hdmi_connector_detect(
 	 * some platforms may not have hpd gpio. Rely only on the status
 	 * provided by REG_HDMI_HPD_INT_STATUS in this case.
 	 */
-	if (hpd_gpio.num == -1)
+	if (!hpd_gpio.gpiod)
 		return detect_reg(hdmi);
 
 	do {
-- 
2.20.1

[PATCH 6/7] RFT: drm/msm/hdmi: Bring up HDMI connector OFF

[Linus Walleij]

There is elaborate code in the HDMI connector handling to
leave the connector in the state it was at power-on and
only touch the GPIOs when the connector .enable() and
.disable() callbacks are called.

I don't think this is what we normally want, initialize
the connector as OFF (possibly saving power?) using the
appropriate GPIO descriptor flags. It will still be
switched on/off in the enable()/disable() connector
callback as before, but we can drop some strange surplus
code.

Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/gpu/drm/msm/hdmi/hdmi.c           | 19 ++++++++++++-----
 drivers/gpu/drm/msm/hdmi/hdmi_connector.c | 25 ++++++-----------------
 2 files changed, 20 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
index c8e8268c76e2..7d87f8821d2f 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -563,13 +563,22 @@ static int msm_hdmi_bind(struct device *dev, struct device *master, void *data)
 	for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
 		const char *name = msm_hdmi_gpio_pdata[i].name;
 		struct gpio_desc *gpiod;
+		enum gpiod_flags flags;
 
 		/*
-		 * We are fetching the GPIO lines "as is" since the connector
-		 * code is enabling and disabling the lines. Until that point
-		 * the power-on default value will be kept.
+		 * Notice the inverse set up here: we initialize the connector
+		 * to OFF state.
 		 */
-		gpiod = devm_gpiod_get_optional(dev, name, GPIOD_ASIS);
+		if (msm_hdmi_gpio_pdata[i].output) {
+			if (msm_hdmi_gpio_pdata[i].value)
+				flags = GPIOD_OUT_LOW;
+			else
+				flags = GPIOD_OUT_HIGH;
+		} else {
+			flags = GPIOD_IN;
+		}
+
+		gpiod = devm_gpiod_get_optional(dev, name, flags);
 		/* This will catch e.g. -PROBE_DEFER */
 		if (IS_ERR(gpiod))
 			return PTR_ERR(gpiod);
@@ -583,7 +592,7 @@ static int msm_hdmi_bind(struct device *dev, struct device *master, void *data)
 			 * in the upstream bindings.
 			 */
 			if (sscanf(name, "qcom,hdmi-tx-%s", name3))
-				gpiod = devm_gpiod_get_optional(dev, name3, GPIOD_ASIS);
+				gpiod = devm_gpiod_get_optional(dev, name3, flags);
 			if (IS_ERR(gpiod))
 				return PTR_ERR(gpiod);
 			if (!gpiod)
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
index c4e9f6d7960f..89c64cc85027 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
@@ -86,16 +86,9 @@ static int gpio_config(struct hdmi *hdmi, bool on)
 		for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
 			struct hdmi_gpio_data gpio = config->gpios[i];
 
-			if (gpio.gpiod) {
-				if (gpio.output) {
-					gpiod_direction_output(gpio.gpiod,
-							       gpio.value);
-				} else {
-					gpiod_direction_input(gpio.gpiod);
-					gpiod_set_value_cansleep(gpio.gpiod,
-								 gpio.value);
-				}
-			}
+			/* The value indicates the value for turning things on */
+			if (gpio.gpiod)
+				gpiod_set_value_cansleep(gpio.gpiod, gpio.value);
 		}
 
 		DBG("gpio on");
@@ -103,16 +96,10 @@ static int gpio_config(struct hdmi *hdmi, bool on)
 		for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
 			struct hdmi_gpio_data gpio = config->gpios[i];
 
-			if (!gpio.gpiod)
-				continue;
-
-			if (gpio.output) {
-				int value = gpio.value ? 0 : 1;
-
-				gpiod_set_value_cansleep(gpio.gpiod, value);
-			}
+			/* The inverse value turns stuff off */
+			if (gpio.gpiod && gpio.output)
+				gpiod_set_value_cansleep(gpio.gpiod, !gpio.value);
 		};
-
 		DBG("gpio off");
 	}
 
-- 
2.20.1

[PATCH 7/7] RFT: drm/msm/hdmi: Do not initialize HPD line value

[Linus Walleij]

After untangling the MSM HDMI GPIO code we see that the code
is deliberately setting the output value of the HPD (hot plug
detect) line to high, even though it is being used as input
which is of course the only viable use of a HPD pin.

This seems dubious: GPIO lines set up as input will have high
impedance (tristate) and the typical electronic construction
involves this line being used with a pull-down resistor around
10KOhm to keep it low (this is sometimes part of a levelshifter
component) and then an inserted connector will pull it up to
VDD and this asserts the HPD signal, as can be seen from the
code reading the HPD GPIO.

Stop try driving a value to the HPD input GPIO.

Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/gpu/drm/msm/hdmi/hdmi_connector.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
index 89c64cc85027..ecbcd8638b66 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
@@ -87,7 +87,7 @@ static int gpio_config(struct hdmi *hdmi, bool on)
 			struct hdmi_gpio_data gpio = config->gpios[i];
 
 			/* The value indicates the value for turning things on */
-			if (gpio.gpiod)
+			if (gpio.gpiod && gpio.output)
 				gpiod_set_value_cansleep(gpio.gpiod, gpio.value);
 		}
 
-- 
2.20.1

Re: [PATCH 4/7] gpio: of: Support some legacy Qualcomm HDMI bindings

[Rob Clark]

On Sat, Jun 29, 2019 at 6:02 AM Linus Walleij <linus.walleij@linaro.org> wrote:
>
> Insteaf of the MSM DRM code going around and inspecting the
> device tree nodes by itself to find "qcom,misc" GPIO phandles,
> we add a quirk to the core so that if "qcom,misc-gpios" and
> "qcom,misc-gpio" isn't found, we try to find just
> "qcom,misc" as a last resort. Provide an explicit whitelist
> for those GPIOs.
>
> Cc: Rob Clark <robdclark@gmail.com>
> Cc: Sean Paul <sean@poorly.run>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: freedreno@lists.freedesktop.org
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
> Rob/Sean: if the approach is overall OK I will merge this
> one patch already for v5.3 so the rest can be queued for
> v5.4 later.

I'm ok with this.. although I wonder if we need to try this hard for
backwards compat?  At least I don't see any upstream dts
using the old names.  Maybe it is ok to just look the other way and break them.

IIRC the old names were based on old downstream android kernel
bindings.. but upstream snapdragon support is pretty good these days
and it has been years since I've had to do drm/msm development by
backporting the upstream driver to a crusty old android kernel.

BR,
-R

> ---
>  drivers/gpio/gpiolib-of.c | 43 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 43 insertions(+)
>
> diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
> index aec7bd86ae7e..c927eaf6c88f 100644
> --- a/drivers/gpio/gpiolib-of.c
> +++ b/drivers/gpio/gpiolib-of.c
> @@ -286,6 +286,45 @@ static struct gpio_desc *of_find_regulator_gpio(struct device *dev, const char *
>         return desc;
>  }
>
> +/*
> + * Some non-standard Qualcomm HDMI GPIOs need to be supported as they exist
> + * in random old device trees out there.
> + */
> +static struct gpio_desc *of_find_hdmi_gpio(struct device *dev,
> +                                          const char *con_id,
> +                                          enum of_gpio_flags *of_flags)
> +{
> +       /*
> +        * These are the connection IDs we accept as legacy GPIO phandles.
> +        * If we get here, the same prefix ending with "-gpio" and "-gpios"
> +        * has already been tried so now we finally try with no suffix.
> +        */
> +       const char *whitelist[] = {
> +               "qcom,hdmi-tx-ddc-clk",
> +               "qcom,hdmi-tx-ddc-data",
> +               "qcom,hdmi-tx-hpd",
> +               "qcom,hdmi-tx-mux-en",
> +               "qcom,hdmi-tx-mux-sel",
> +               "qcom,hdmi-tx-mux-lpm",
> +       };
> +       struct device_node *np = dev->of_node;
> +       struct gpio_desc *desc;
> +       int i;
> +
> +       if (!IS_ENABLED(CONFIG_DRM_MSM))
> +               return ERR_PTR(-ENOENT);
> +
> +       if (!con_id)
> +               return ERR_PTR(-ENOENT);
> +
> +       i = match_string(whitelist, ARRAY_SIZE(whitelist), con_id);
> +       if (i < 0)
> +               return ERR_PTR(-ENOENT);
> +
> +       desc = of_get_named_gpiod_flags(np, con_id, 0, of_flags);
> +       return desc;
> +}
> +
>  struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
>                                unsigned int idx, unsigned long *flags)
>  {
> @@ -330,6 +369,10 @@ struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
>         if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
>                 desc = of_find_regulator_gpio(dev, con_id, &of_flags);
>
> +       /* Special handling for HDMI GPIOs if used */
> +       if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
> +               desc = of_find_hdmi_gpio(dev, con_id, &of_flags);
> +
>         if (IS_ERR(desc))
>                 return desc;
>
> --
> 2.20.1
>

Re: [PATCH 4/7] gpio: of: Support some legacy Qualcomm HDMI bindings

[Linus Walleij]

On Sun, Jun 30, 2019 at 3:26 PM Rob Clark <robdclark@gmail.com> wrote:

> I'm ok with this.. although I wonder if we need to try this hard for
> backwards compat?  At least I don't see any upstream dts
> using the old names.  Maybe it is ok to just look the other way and break them.

I am usually of the opinion that if a tree falls in the forest and noone
is there to hear it, who cares what sound it makes.

So we can just apply the other patches and not this one, which
should work just fine. It will support the variants of the
bindings ending with "-gpios" or "-gpio".

Yours,
Linus Walleij

Re: [PATCH 4/7] gpio: of: Support some legacy Qualcomm HDMI bindings

[Rob Clark]

On Sun, Jun 30, 2019 at 8:18 AM Linus Walleij <linus.walleij@linaro.org> wrote:
>
> On Sun, Jun 30, 2019 at 3:26 PM Rob Clark <robdclark@gmail.com> wrote:
>
> > I'm ok with this.. although I wonder if we need to try this hard for
> > backwards compat?  At least I don't see any upstream dts
> > using the old names.  Maybe it is ok to just look the other way and break them.
>
> I am usually of the opinion that if a tree falls in the forest and noone
> is there to hear it, who cares what sound it makes.
>
> So we can just apply the other patches and not this one, which
> should work just fine. It will support the variants of the
> bindings ending with "-gpios" or "-gpio".

Sounds good.. if the tree falls loud enough that someone does indeed
hear it, we can resurrect this patch :-)

BR,
-R

Re: [PATCH 1/7] drm/msm/mdp4: Drop unused GPIO include

[Linus Walleij]

On Sat, Jun 29, 2019 at 3:01 PM Linus Walleij <linus.walleij@linaro.org> wrote:

> This file is not using any symbols from <linux/gpio.h> so just
> drop this include.
>
> Cc: Rob Clark <robdclark@gmail.com>
> Cc: Sean Paul <sean@poorly.run>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: freedreno@lists.freedesktop.org
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Rob & friends: can this be merged to wherever you merge
the MSM DRM patches? If it is in drm-misc I can apply it
but I need some ACKs.

Yours,
Linus Walleij

Re: [PATCH 1/7] drm/msm/mdp4: Drop unused GPIO include

[Linus Walleij]

On Sun, Jul 28, 2019 at 12:02 PM Linus Walleij <linus.walleij@linaro.org> wrote:
> On Sat, Jun 29, 2019 at 3:01 PM Linus Walleij <linus.walleij@linaro.org> wrote:
>
> > This file is not using any symbols from <linux/gpio.h> so just
> > drop this include.
> >
> > Cc: Rob Clark <robdclark@gmail.com>
> > Cc: Sean Paul <sean@poorly.run>
> > Cc: linux-arm-msm@vger.kernel.org
> > Cc: freedreno@lists.freedesktop.org
> > Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
>
> Rob & friends: can this be merged to wherever you merge
> the MSM DRM patches? If it is in drm-misc I can apply it
> but I need some ACKs.

Ping on this!

Yours,
Linus Walleij

Re: [PATCH 1/7] drm/msm/mdp4: Drop unused GPIO include

[Brian Masney]

On Sat, Jun 29, 2019 at 02:59:27PM +0200, Linus Walleij wrote:
> This file is not using any symbols from <linux/gpio.h> so just
> drop this include.
> 
> Cc: Rob Clark <robdclark@gmail.com>
> Cc: Sean Paul <sean@poorly.run>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: freedreno@lists.freedesktop.org
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

For the series:

Reviewed-by: Brian Masney <masneyb@onstation.org>