kernel: remove support for kernel 4.19

We use 5.4 on all targets by default, and 4.19 has never been released
in a stable version. There is no reason to keep it.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

2 files changed, 0 insertions, 123 deletions

diff --git a/target/linux/tegra/patches-4.19/100-serial8250-on-tegra-hsuart-recover-from-spurious-interrupts-due-to-tegra2-silicon-bug.patch b/target/linux/tegra/patches-4.19/100-serial8250-on-tegra-hsuart-recover-from-spurious-interrupts-due-to-tegra2-silicon-bug.patch
deleted file mode 100644
index 9e8c331934..0000000000
--- a/target/linux/tegra/patches-4.19/100-serial8250-on-tegra-hsuart-recover-from-spurious-interrupts-due-to-tegra2-silicon-bug.patch
+++ /dev/null
@@ -1,77 +0,0 @@
-From patchwork Fri Jul 13 11:32:42 2018
-Content-Type: text/plain; charset="utf-8"
-MIME-Version: 1.0
-Content-Transfer-Encoding: 7bit
-Subject: serial8250 on tegra hsuart: recover from spurious interrupts due to
- tegra2 silicon bug
-X-Patchwork-Submitter: "David R. Piegdon" <lkml@p23q.org>
-X-Patchwork-Id: 943440
-Message-Id: <4676ea34-69ce-5422-1ded-94218b89f7d9@p23q.org>
-To: linux-tegra@vger.kernel.org
-Date: Fri, 13 Jul 2018 11:32:42 +0000
-From: "David R. Piegdon" <lkml@p23q.org>
-List-Id: <linux-tegra.vger.kernel.org>
-
-Hi,
-a while back I sent a few mails regarding spurious interrupts in the
-UARTA (hsuart) block of the Tegra2 SoC, when using the 8250 driver for
-it instead of the hsuart driver. After going down a pretty deep
-debugging/testing hole, I think I found a patch that fixes the issue. So
-far testing in a reboot-cycle suggests that the error frequency dropped
-from >3% of all reboots to at least <0.05% of all reboots. Tests
-continue to run over the weekend.
-
-The patch below already is a second iteration; the first did not reset
-the MCR or contain the lines below '// clear interrupts'. This resulted
-in no more spurious interrupts, but in a few % of spurious interrupts
-that were recovered the UART block did not receive any characters any
-more. So further resetting was required to fully reacquire operational
-state of the UART block.
-
-I'd love any comments/suggestions on this!
-
-Cheers,
-
-David
-
---- a/drivers/tty/serial/8250/8250_core.c
-+++ b/drivers/tty/serial/8250/8250_core.c
-@@ -136,6 +136,38 @@ static irqreturn_t serial8250_interrupt(
- 				"serial8250: too much work for irq%d\n", irq);
- 			break;
- 		}
-+
-+#ifdef CONFIG_ARCH_TEGRA_2x_SOC
-+		if (!handled && (port->type == PORT_TEGRA)) {
-+			/*
-+			 * Fix Tegra 2 CPU silicon bug where sometimes
-+			 * "TX holding register empty" interrupts result in a
-+			 * bad (metastable?) state in Tegras HSUART IP core.
-+			 * Only way to recover seems to be to reset all
-+			 * interrupts as well as the TX queue and the MCR.
-+			 * But we don't want to loose any outgoing characters,
-+			 * so only do it if the RX and TX queues are empty.
-+			 */
-+			unsigned char lsr = port->serial_in(port, UART_LSR);
-+			const unsigned char fifo_empty_mask =
-+						(UART_LSR_TEMT | UART_LSR_THRE);
-+			if (((lsr & (UART_LSR_DR | fifo_empty_mask)) ==
-+							fifo_empty_mask)) {
-+				port->serial_out(port, UART_IER, 0);
-+				port->serial_out(port, UART_MCR, 0);
-+				serial8250_clear_and_reinit_fifos(up);
-+				port->serial_out(port, UART_MCR, up->mcr);
-+				port->serial_out(port, UART_IER, up->ier);
-+				// clear interrupts
-+				serial_port_in(port, UART_LSR);
-+				serial_port_in(port, UART_RX);
-+				serial_port_in(port, UART_IIR);
-+				serial_port_in(port, UART_MSR);
-+				up->lsr_saved_flags = 0;
-+				up->msr_saved_flags = 0;
-+			}
-+		}
-+#endif
- 	} while (l != end);
- 
- 	spin_unlock(&i->lock);
diff --git a/target/linux/tegra/patches-4.19/101-ARM-dtc-tegra-enable-front-panel-leds-in-TrimSlice.patch b/target/linux/tegra/patches-4.19/101-ARM-dtc-tegra-enable-front-panel-leds-in-TrimSlice.patch
deleted file mode 100644
index ae48e8d862..0000000000
--- a/target/linux/tegra/patches-4.19/101-ARM-dtc-tegra-enable-front-panel-leds-in-TrimSlice.patch
+++ /dev/null
@@ -1,46 +0,0 @@
---- a/arch/arm/boot/dts/tegra20-trimslice.dts
-+++ b/arch/arm/boot/dts/tegra20-trimslice.dts
-@@ -200,16 +200,17 @@
- 			conf_ata {
- 				nvidia,pins = "ata", "atc", "atd", "ate",
- 					"crtp", "dap2", "dap3", "dap4", "dta",
--					"dtb", "dtc", "dtd", "dte", "gmb",
--					"gme", "i2cp", "pta", "slxc", "slxd",
--					"spdi", "spdo", "uda";
-+					"dtb", "dtc", "dtd", "gmb", "gme",
-+					"i2cp", "pta", "slxc", "slxd", "spdi",
-+					"spdo", "uda";
- 				nvidia,pull = <TEGRA_PIN_PULL_NONE>;
- 				nvidia,tristate = <TEGRA_PIN_ENABLE>;
- 			};
- 			conf_atb {
- 				nvidia,pins = "atb", "cdev1", "cdev2", "dap1",
--					"gma", "gmc", "gmd", "gpu", "gpu7",
--					"gpv", "sdio1", "slxa", "slxk", "uac";
-+					"dte", "gma", "gmc", "gmd", "gpu",
-+					"gpu7", "gpv", "sdio1", "slxa", "slxk",
-+					"uac";
- 				nvidia,pull = <TEGRA_PIN_PULL_NONE>;
- 				nvidia,tristate = <TEGRA_PIN_DISABLE>;
- 			};
-@@ -402,6 +403,20 @@
- 		};
- 	};
- 
-+	gpio-leds {
-+		compatible = "gpio-leds";
-+
-+		ds2 {
-+			label = "trimslice:green:right";
-+			gpios = <&gpio TEGRA_GPIO(D, 2) GPIO_ACTIVE_LOW>;
-+		};
-+
-+		ds3 {
-+			label = "trimslice:green:left";
-+			gpios = <&gpio TEGRA_GPIO(BB, 5) GPIO_ACTIVE_LOW>;
-+		};
-+	};
-+
- 	poweroff {
- 		compatible = "gpio-poweroff";
- 		gpios = <&gpio TEGRA_GPIO(X, 7) GPIO_ACTIVE_LOW>;