From: Maxime Ripard <maxime@cerno.tech>
To: Daniel Vetter <daniel@ffwll.ch>,
Florian Fainelli <f.fainelli@gmail.com>,
David Airlie <airlied@linux.ie>,
Broadcom internal kernel review list
<bcm-kernel-feedback-list@broadcom.com>,
Michael Turquette <mturquette@baylibre.com>,
Scott Branden <sbranden@broadcom.com>,
Stephen Boyd <sboyd@kernel.org>, Emma Anholt <emma@anholt.net>,
Ray Jui <rjui@broadcom.com>, Maxime Ripard <mripard@kernel.org>
Cc: linux-rpi-kernel@lists.infradead.org, linux-clk@vger.kernel.org,
linux-kernel@vger.kernel.org, Dom Cobley <popcornmix@gmail.com>,
dri-devel@lists.freedesktop.org,
Maxime Ripard <maxime@cerno.tech>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 3/7] firmware: raspberrypi: Provide a helper to query a clock max rate
Date: Tue, 20 Sep 2022 14:50:22 +0200 [thread overview]
Message-ID: <20220815-rpi-fix-4k-60-v2-3-983276b83f62@cerno.tech> (raw)
In-Reply-To: <20220815-rpi-fix-4k-60-v2-0-983276b83f62@cerno.tech>
The firmware allows to query for its clocks the operating range of a
given clock. We'll need this for some drivers (KMS, in particular) to
infer the state of some configuration options, so let's create a
function to do so.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
diff --git a/drivers/firmware/raspberrypi.c b/drivers/firmware/raspberrypi.c
index b916e1e171f8..c4b9ea70f5a7 100644
--- a/drivers/firmware/raspberrypi.c
+++ b/drivers/firmware/raspberrypi.c
@@ -228,6 +228,21 @@ static void rpi_register_clk_driver(struct device *dev)
-1, NULL, 0);
}
+unsigned int rpi_firmware_clk_get_max_rate(struct rpi_firmware *fw, unsigned int id)
+{
+ struct rpi_firmware_clk_rate_request msg =
+ RPI_FIRMWARE_CLK_RATE_REQUEST(id);
+ int ret;
+
+ ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_MAX_CLOCK_RATE,
+ &msg, sizeof(msg));
+ if (ret)
+ return 0;
+
+ return le32_to_cpu(msg.rate);
+}
+EXPORT_SYMBOL_GPL(rpi_firmware_clk_get_max_rate);
+
static void rpi_firmware_delete(struct kref *kref)
{
struct rpi_firmware *fw = container_of(kref, struct rpi_firmware,
diff --git a/include/soc/bcm2835/raspberrypi-firmware.h b/include/soc/bcm2835/raspberrypi-firmware.h
index 74c7bcc1ac2a..10248c370229 100644
--- a/include/soc/bcm2835/raspberrypi-firmware.h
+++ b/include/soc/bcm2835/raspberrypi-firmware.h
@@ -154,12 +154,32 @@ enum rpi_firmware_clk_id {
RPI_FIRMWARE_NUM_CLK_ID,
};
+/**
+ * struct rpi_firmware_clk_rate_request - Firmware Request for a rate
+ * @id: ID of the clock being queried
+ * @rate: Rate in Hertz. Set by the firmware.
+ *
+ * Used by @RPI_FIRMWARE_GET_CLOCK_RATE, @RPI_FIRMWARE_GET_CLOCK_MEASURED,
+ * @RPI_FIRMWARE_GET_MAX_CLOCK_RATE and @RPI_FIRMWARE_GET_MIN_CLOCK_RATE.
+ */
+struct rpi_firmware_clk_rate_request {
+ __le32 id;
+ __le32 rate;
+} __packed;
+
+#define RPI_FIRMWARE_CLK_RATE_REQUEST(_id) \
+ { \
+ .id = _id, \
+ }
+
#if IS_ENABLED(CONFIG_RASPBERRYPI_FIRMWARE)
int rpi_firmware_property(struct rpi_firmware *fw,
u32 tag, void *data, size_t len);
int rpi_firmware_property_list(struct rpi_firmware *fw,
void *data, size_t tag_size);
void rpi_firmware_put(struct rpi_firmware *fw);
+unsigned int rpi_firmware_clk_get_max_rate(struct rpi_firmware *fw,
+ unsigned int id);
struct device_node *rpi_firmware_find_node(void);
struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node);
struct rpi_firmware *devm_rpi_firmware_get(struct device *dev,
@@ -179,6 +199,12 @@ static inline int rpi_firmware_property_list(struct rpi_firmware *fw,
static inline void rpi_firmware_put(struct rpi_firmware *fw) { }
+static inline unsigned int rpi_firmware_clk_get_max_rate(struct rpi_firmware *fw,
+ unsigned int id)
+{
+ return UINT_MAX;
+}
+
static inline struct device_node *rpi_firmware_find_node(void)
{
return NULL;
--
b4 0.10.0
next prev parent reply other threads:[~2022-09-20 12:53 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-20 12:50 [PATCH v2 0/7] drm/vc4: Fix the core clock behaviour Maxime Ripard
2022-09-20 12:50 ` [PATCH v2 1/7] firmware: raspberrypi: Introduce rpi_firmware_find_node() Maxime Ripard
2022-09-20 12:50 ` [PATCH v2 2/7] firmware: raspberrypi: Move the clock IDs to the firmware header Maxime Ripard
2022-09-20 16:01 ` Stefan Wahren
2022-09-21 9:17 ` Maxime Ripard
2022-09-20 12:50 ` Maxime Ripard [this message]
2022-09-29 0:23 ` [PATCH v2 3/7] firmware: raspberrypi: Provide a helper to query a clock max rate Stephen Boyd
2022-10-10 16:52 ` Stefan Wahren
2022-09-20 12:50 ` [PATCH v2 4/7] drm/vc4: hdmi: Fix hdmi_enable_4kp60 detection Maxime Ripard
2022-09-20 12:50 ` [PATCH v2 5/7] drm/vc4: hdmi: Rework hdmi_enable_4kp60 detection code Maxime Ripard
2022-09-20 12:50 ` [PATCH v2 6/7] drm/vc4: hdmi: Add more checks for 4k resolutions Maxime Ripard
2022-09-20 12:50 ` [PATCH v2 7/7] drm/vc4: Make sure we don't end up with a core clock too high Maxime Ripard
2022-10-10 11:44 ` [PATCH v2 0/7] drm/vc4: Fix the core clock behaviour Maxime Ripard
2022-10-10 19:07 ` Florian Fainelli
2022-10-13 8:59 ` Maxime Ripard
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