+++ /dev/null
-From 7094832b5ac861b0bd7ed8866c93cb15ef619996 Mon Sep 17 00:00:00 2001
-From: Stephan Gerhold <stephan.gerhold@linaro.org>
-Date: Tue, 8 Apr 2025 19:22:47 +0200
-Subject: serial: msm: Configure correct working mode before starting earlycon
-
-From: Stephan Gerhold <stephan.gerhold@linaro.org>
-
-commit 7094832b5ac861b0bd7ed8866c93cb15ef619996 upstream.
-
-The MSM UART DM controller supports different working modes, e.g. DMA or
-the "single-character mode", where all reads/writes operate on a single
-character rather than 4 chars (32-bit) at once. When using earlycon,
-__msm_console_write() always writes 4 characters at a time, but we don't
-know which mode the bootloader was using and we don't set the mode either.
-
-This causes garbled output if the bootloader was using the single-character
-mode, because only every 4th character appears in the serial console, e.g.
-
- "[ 00oni pi 000xf0[ 00i s 5rm9(l)l s 1 1 SPMTA 7:C 5[ 00A ade k d[
- 00ano:ameoi .Q1B[ 00ac _idaM00080oo'"
-
-If the bootloader was using the DMA ("DM") mode, output would likely fail
-entirely. Later, when the full serial driver probes, the port is
-re-initialized and output works as expected.
-
-Fix this also for earlycon by clearing the DMEN register and
-reset+re-enable the transmitter to apply the change. This ensures the
-transmitter is in the expected state before writing any output.
-
-Cc: stable <stable@kernel.org>
-Fixes: 0efe72963409 ("tty: serial: msm: Add earlycon support")
-Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>
-Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
-Link: https://lore.kernel.org/r/20250408-msm-serial-earlycon-v1-1-429080127530@linaro.org
-Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
----
- drivers/tty/serial/msm_serial.c | 6 ++++++
- 1 file changed, 6 insertions(+)
-
---- a/drivers/tty/serial/msm_serial.c
-+++ b/drivers/tty/serial/msm_serial.c
-@@ -1737,6 +1737,12 @@ msm_serial_early_console_setup_dm(struct
- if (!device->port.membase)
- return -ENODEV;
-
-+ /* Disable DM / single-character modes */
-+ msm_write(&device->port, 0, UARTDM_DMEN);
-+ msm_write(&device->port, MSM_UART_CR_CMD_RESET_RX, MSM_UART_CR);
-+ msm_write(&device->port, MSM_UART_CR_CMD_RESET_TX, MSM_UART_CR);
-+ msm_write(&device->port, MSM_UART_CR_TX_ENABLE, MSM_UART_CR);
-+
- device->con->write = msm_serial_early_write_dm;
- return 0;
- }
usb-storage-quirk-for-adata-portable-hdd-ch94.patch
mei-me-add-panther-lake-h-did.patch
kvm-x86-reset-irte-to-host-control-if-new-route-isn-t-postable.patch
-serial-msm-configure-correct-working-mode-before-starting-earlycon.patch
serial-sifive-lock-port-in-startup-shutdown-callbacks.patch
usb-serial-ftdi_sio-add-support-for-abacus-electrics-optical-probe.patch
usb-serial-option-add-sierra-wireless-em9291.patch
+++ /dev/null
-From 7094832b5ac861b0bd7ed8866c93cb15ef619996 Mon Sep 17 00:00:00 2001
-From: Stephan Gerhold <stephan.gerhold@linaro.org>
-Date: Tue, 8 Apr 2025 19:22:47 +0200
-Subject: serial: msm: Configure correct working mode before starting earlycon
-
-From: Stephan Gerhold <stephan.gerhold@linaro.org>
-
-commit 7094832b5ac861b0bd7ed8866c93cb15ef619996 upstream.
-
-The MSM UART DM controller supports different working modes, e.g. DMA or
-the "single-character mode", where all reads/writes operate on a single
-character rather than 4 chars (32-bit) at once. When using earlycon,
-__msm_console_write() always writes 4 characters at a time, but we don't
-know which mode the bootloader was using and we don't set the mode either.
-
-This causes garbled output if the bootloader was using the single-character
-mode, because only every 4th character appears in the serial console, e.g.
-
- "[ 00oni pi 000xf0[ 00i s 5rm9(l)l s 1 1 SPMTA 7:C 5[ 00A ade k d[
- 00ano:ameoi .Q1B[ 00ac _idaM00080oo'"
-
-If the bootloader was using the DMA ("DM") mode, output would likely fail
-entirely. Later, when the full serial driver probes, the port is
-re-initialized and output works as expected.
-
-Fix this also for earlycon by clearing the DMEN register and
-reset+re-enable the transmitter to apply the change. This ensures the
-transmitter is in the expected state before writing any output.
-
-Cc: stable <stable@kernel.org>
-Fixes: 0efe72963409 ("tty: serial: msm: Add earlycon support")
-Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>
-Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
-Link: https://lore.kernel.org/r/20250408-msm-serial-earlycon-v1-1-429080127530@linaro.org
-Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
----
- drivers/tty/serial/msm_serial.c | 6 ++++++
- 1 file changed, 6 insertions(+)
-
---- a/drivers/tty/serial/msm_serial.c
-+++ b/drivers/tty/serial/msm_serial.c
-@@ -1732,6 +1732,12 @@ msm_serial_early_console_setup_dm(struct
- if (!device->port.membase)
- return -ENODEV;
-
-+ /* Disable DM / single-character modes */
-+ msm_write(&device->port, 0, UARTDM_DMEN);
-+ msm_write(&device->port, MSM_UART_CR_CMD_RESET_RX, MSM_UART_CR);
-+ msm_write(&device->port, MSM_UART_CR_CMD_RESET_TX, MSM_UART_CR);
-+ msm_write(&device->port, MSM_UART_CR_TX_ENABLE, MSM_UART_CR);
-+
- device->con->write = msm_serial_early_write_dm;
- return 0;
- }
usb-storage-quirk-for-adata-portable-hdd-ch94.patch
mei-me-add-panther-lake-h-did.patch
kvm-x86-reset-irte-to-host-control-if-new-route-isn-t-postable.patch
-serial-msm-configure-correct-working-mode-before-starting-earlycon.patch
serial-sifive-lock-port-in-startup-shutdown-callbacks.patch
usb-serial-ftdi_sio-add-support-for-abacus-electrics-optical-probe.patch
usb-serial-option-add-sierra-wireless-em9291.patch
+++ /dev/null
-From 7094832b5ac861b0bd7ed8866c93cb15ef619996 Mon Sep 17 00:00:00 2001
-From: Stephan Gerhold <stephan.gerhold@linaro.org>
-Date: Tue, 8 Apr 2025 19:22:47 +0200
-Subject: serial: msm: Configure correct working mode before starting earlycon
-
-From: Stephan Gerhold <stephan.gerhold@linaro.org>
-
-commit 7094832b5ac861b0bd7ed8866c93cb15ef619996 upstream.
-
-The MSM UART DM controller supports different working modes, e.g. DMA or
-the "single-character mode", where all reads/writes operate on a single
-character rather than 4 chars (32-bit) at once. When using earlycon,
-__msm_console_write() always writes 4 characters at a time, but we don't
-know which mode the bootloader was using and we don't set the mode either.
-
-This causes garbled output if the bootloader was using the single-character
-mode, because only every 4th character appears in the serial console, e.g.
-
- "[ 00oni pi 000xf0[ 00i s 5rm9(l)l s 1 1 SPMTA 7:C 5[ 00A ade k d[
- 00ano:ameoi .Q1B[ 00ac _idaM00080oo'"
-
-If the bootloader was using the DMA ("DM") mode, output would likely fail
-entirely. Later, when the full serial driver probes, the port is
-re-initialized and output works as expected.
-
-Fix this also for earlycon by clearing the DMEN register and
-reset+re-enable the transmitter to apply the change. This ensures the
-transmitter is in the expected state before writing any output.
-
-Cc: stable <stable@kernel.org>
-Fixes: 0efe72963409 ("tty: serial: msm: Add earlycon support")
-Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>
-Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
-Link: https://lore.kernel.org/r/20250408-msm-serial-earlycon-v1-1-429080127530@linaro.org
-Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
----
- drivers/tty/serial/msm_serial.c | 6 ++++++
- 1 file changed, 6 insertions(+)
-
---- a/drivers/tty/serial/msm_serial.c
-+++ b/drivers/tty/serial/msm_serial.c
-@@ -1723,6 +1723,12 @@ msm_serial_early_console_setup_dm(struct
- if (!device->port.membase)
- return -ENODEV;
-
-+ /* Disable DM / single-character modes */
-+ msm_write(&device->port, 0, UARTDM_DMEN);
-+ msm_write(&device->port, MSM_UART_CR_CMD_RESET_RX, MSM_UART_CR);
-+ msm_write(&device->port, MSM_UART_CR_CMD_RESET_TX, MSM_UART_CR);
-+ msm_write(&device->port, MSM_UART_CR_TX_ENABLE, MSM_UART_CR);
-+
- device->con->write = msm_serial_early_write_dm;
- return 0;
- }
virtio_console-fix-missing-byte-order-handling-for-cols-and-rows.patch
mcb-fix-a-double-free-bug-in-chameleon_parse_gdd.patch
usb-storage-quirk-for-adata-portable-hdd-ch94.patch
-serial-msm-configure-correct-working-mode-before-starting-earlycon.patch
serial-sifive-lock-port-in-startup-shutdown-callbacks.patch
usb-serial-ftdi_sio-add-support-for-abacus-electrics-optical-probe.patch
usb-serial-option-add-sierra-wireless-em9291.patch
projects / thirdparty / kernel / stable-queue.git / commitdiff
