[PATCH 25/31] dm: core: add a function to decode display timings
Dario Binacchi
dariobin at libero.it
Tue Aug 25 11:21:18 CEST 2020
The patch adds a function to get display timings from the device tree
node attached to the device.
Signed-off-by: Dario Binacchi <dariobin at libero.it>
---
arch/sandbox/dts/test.dts | 46 ++++++++++++++++++++++
drivers/core/read.c | 6 +++
include/dm/read.h | 24 ++++++++++++
test/dm/test-fdt.c | 80 +++++++++++++++++++++++++++++++++++++++
4 files changed, 156 insertions(+)
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 7f5d8f3aeb..dcf1a94b82 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -129,6 +129,52 @@
str-value = "test string";
interrupts-extended = <&irq 3 0>;
acpi,name = "GHIJ";
+ display-timings {
+ timing0: 240x320 {
+ clock-frequency = <6500000>;
+ hactive = <240>;
+ vactive = <320>;
+ hfront-porch = <6>;
+ hback-porch = <7>;
+ hsync-len = <1>;
+ vback-porch = <5>;
+ vfront-porch = <8>;
+ vsync-len = <2>;
+ hsync-active = <1>;
+ vsync-active = <0>;
+ de-active = <1>;
+ pixelclk-active = <1>;
+ interlaced;
+ doublescan;
+ doubleclk;
+ };
+ timing1: 480x800 {
+ clock-frequency = <9000000>;
+ hactive = <480>;
+ vactive = <800>;
+ hfront-porch = <10>;
+ hback-porch = <59>;
+ hsync-len = <12>;
+ vback-porch = <15>;
+ vfront-porch = <17>;
+ vsync-len = <16>;
+ hsync-active = <0>;
+ vsync-active = <1>;
+ de-active = <0>;
+ pixelclk-active = <0>;
+ };
+ timing2: 800x480 {
+ clock-frequency = <33500000>;
+ hactive = <800>;
+ vactive = <480>;
+ hback-porch = <89>;
+ hfront-porch = <164>;
+ vback-porch = <23>;
+ vfront-porch = <10>;
+ hsync-len = <11>;
+ vsync-len = <13>;
+ };
+ };
};
junk {
diff --git a/drivers/core/read.c b/drivers/core/read.c
index 8bb456bc3f..27715942d0 100644
--- a/drivers/core/read.c
+++ b/drivers/core/read.c
@@ -359,3 +359,9 @@ int dev_get_child_count(const struct udevice *dev)
{
return ofnode_get_child_count(dev_ofnode(dev));
}
+
+int dev_decode_display_timing(const struct udevice *dev, int index,
+ struct display_timing *config)
+{
+ return ofnode_decode_display_timing(dev_ofnode(dev), index, config);
+}
diff --git a/include/dm/read.h b/include/dm/read.h
index 0a7aacd2d0..7c15d51cf2 100644
--- a/include/dm/read.h
+++ b/include/dm/read.h
@@ -680,6 +680,23 @@ int dev_read_alias_highest_id(const char *stem);
*/
int dev_get_child_count(const struct udevice *dev);
+/**
+ * dev_decode_display_timing() - decode display timings
+ *
+ * Decode display timings from the supplied 'display-timings' node.
+ * See doc/device-tree-bindings/video/display-timing.txt for binding
+ * information.
+ *
+ * @dev: device to read DT display timings from. The node linked to the device
+ * contains a child node called 'display-timings' which in turn contains
+ * one or more display timing nodes.
+ * @index: index number to read (0=first timing subnode)
+ * @config: place to put timings
+ * @return 0 if OK, -FDT_ERR_NOTFOUND if not found
+ */
+int dev_decode_display_timing(const struct udevice *dev, int index,
+ struct display_timing *config);
+
#else /* CONFIG_DM_DEV_READ_INLINE is enabled */
static inline int dev_read_u32(const struct udevice *dev,
@@ -1002,6 +1019,13 @@ static inline int dev_get_child_count(const struct udevice *dev)
return ofnode_get_child_count(dev_ofnode(dev));
}
+static inline int dev_decode_display_timing(const struct udevice *dev,
+ int index,
+ struct display_timing *config)
+{
+ return ofnode_decode_display_timing(dev_ofnode(dev), index, config);
+}
+
#endif /* CONFIG_DM_DEV_READ_INLINE */
/**
diff --git a/test/dm/test-fdt.c b/test/dm/test-fdt.c
index 30a7a933dd..c4bb01eeba 100644
--- a/test/dm/test-fdt.c
+++ b/test/dm/test-fdt.c
@@ -1120,3 +1120,83 @@ static int dm_test_ofdata_order(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_ofdata_order, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
+
+/* Test dev_decode_display_timing() */
+static int dm_test_decode_display_timing(struct unit_test_state *uts)
+{
+ struct udevice *dev;
+ struct display_timing timing;
+
+ ut_assertok(uclass_first_device_err(UCLASS_TEST_FDT, &dev));
+ ut_asserteq_str("a-test", dev->name);
+
+ ut_assertok(dev_decode_display_timing(dev, 0, &timing));
+ ut_assert(timing.hactive.typ == 240);
+ ut_assert(timing.hback_porch.typ == 7);
+ ut_assert(timing.hfront_porch.typ == 6);
+ ut_assert(timing.hsync_len.typ == 1);
+ ut_assert(timing.vactive.typ == 320);
+ ut_assert(timing.vback_porch.typ == 5);
+ ut_assert(timing.vfront_porch.typ == 8);
+ ut_assert(timing.vsync_len.typ == 2);
+ ut_assert(timing.pixelclock.typ == 6500000);
+ ut_assert(timing.flags & DISPLAY_FLAGS_HSYNC_HIGH);
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_HSYNC_LOW));
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_VSYNC_HIGH));
+ ut_assert(timing.flags & DISPLAY_FLAGS_VSYNC_LOW);
+ ut_assert(timing.flags & DISPLAY_FLAGS_DE_HIGH);
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_DE_LOW));
+ ut_assert(timing.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE);
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE));
+ ut_assert(timing.flags & DISPLAY_FLAGS_INTERLACED);
+ ut_assert(timing.flags & DISPLAY_FLAGS_DOUBLESCAN);
+ ut_assert(timing.flags & DISPLAY_FLAGS_DOUBLECLK);
+
+ ut_assertok(dev_decode_display_timing(dev, 1, &timing));
+ ut_assert(timing.hactive.typ == 480);
+ ut_assert(timing.hback_porch.typ == 59);
+ ut_assert(timing.hfront_porch.typ == 10);
+ ut_assert(timing.hsync_len.typ == 12);
+ ut_assert(timing.vactive.typ == 800);
+ ut_assert(timing.vback_porch.typ == 15);
+ ut_assert(timing.vfront_porch.typ == 17);
+ ut_assert(timing.vsync_len.typ == 16);
+ ut_assert(timing.pixelclock.typ == 9000000);
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_HSYNC_HIGH));
+ ut_assert(timing.flags & DISPLAY_FLAGS_HSYNC_LOW);
+ ut_assert(timing.flags & DISPLAY_FLAGS_VSYNC_HIGH);
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_VSYNC_LOW));
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_DE_HIGH));
+ ut_assert(timing.flags & DISPLAY_FLAGS_DE_LOW);
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE));
+ ut_assert(timing.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE);
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_INTERLACED));
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_DOUBLESCAN));
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_DOUBLECLK));
+
+ ut_assertok(dev_decode_display_timing(dev, 2, &timing));
+ ut_assert(timing.hactive.typ == 800);
+ ut_assert(timing.hback_porch.typ == 89);
+ ut_assert(timing.hfront_porch.typ == 164);
+ ut_assert(timing.hsync_len.typ == 11);
+ ut_assert(timing.vactive.typ == 480);
+ ut_assert(timing.vback_porch.typ == 23);
+ ut_assert(timing.vfront_porch.typ == 10);
+ ut_assert(timing.vsync_len.typ == 13);
+ ut_assert(timing.pixelclock.typ == 33500000);
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_HSYNC_HIGH));
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_HSYNC_LOW));
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_VSYNC_HIGH));
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_VSYNC_LOW));
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_DE_HIGH));
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_DE_LOW));
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE));
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE));
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_INTERLACED));
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_DOUBLESCAN));
+ ut_assert(!(timing.flags & DISPLAY_FLAGS_DOUBLECLK));
+
+ ut_assert(dev_decode_display_timing(dev, 3, &timing));
+ return 0;
+}
+DM_TEST(dm_test_decode_display_timing, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
--
2.17.1
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