uart_update_termios is called on console resume and restores the line parameters using cons->cflag before resetting it. However code in uart_resume_port does the same afterwards, applying a 0 value to the port's cflag and erasing the correct setting. This patch preserves the value of cflag in uart_update_termios to prevent this and allow the serial console to restore properly even if there is no program using it on user side. Serial code has been largely refactored upstream in the upstream kernel and faulty code apparently removed. Fixes bug 831077 Change-Id: Ia894f971d9b6bb0c6103dbca9d169dc2a2148f84 Reviewed-on: http://git-master/r/33098 Reviewed-by: Alex Courbot <acourbot@nvidia.com> Tested-by: Alex Courbot <acourbot@nvidia.com> Reviewed-by: David Schalig <dschalig@nvidia.com> Reviewed-by: Janne Hellsten <jhellsten@nvidia.com>
The commit 4547be7 rewrites suspend and resume functions. According to this rewrite, when a serial port is a printk console device and can suspend(without set no_console_suspend flag), it will definitely call set_termios function during its resume, but parameter termios isn't initialized, this will pass an unpredictable config to the serial port. If this serial port is not a userspace opened tty device , a suspend and resume action will make this serial port unusable. I.E. ttyS0 is a printk console device, ttyS1 or keyboard+display is userspace tty device, a suspend/resume action will make ttyS0 unusable. If a serial port is both a printk console device and an opened tty device, this issue can be overcome because it will call set_termios again with the correct parameter in the uart_change_speed function. Refer to the deleted content of commit 4547be7, revert parts relate to restore settings into parameter termios. It is safe because if a serial port is a printk console only device, the only meaningful field in termios is c_cflag and its old config is saved in uport->cons->cflag, if this port is also an opened tty device, it will clear uport->cons->cflag in the uart_open and the old config is saved in tty->termios. refer http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.37.y.git; a=commit;h=891b9dd10764352926e1e107756aa229dfa2c210 cherry-pick the changes from the kernel 2.6.37 commit id :891b9dd10764352926e1e107756aa229dfa2c210 Cherry-picked http://git-master/r/#change,20302 Bug 819016 Change-Id: Ic7ce0a6d595c0e1f65285d7978db93be12158f0f Reviewed-on: http://git-master/r/30680 Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com> Tested-by: Bharat Nihalani <bnihalani@nvidia.com>
Conflicts: drivers/serial/tegra_hsuart.c drivers/usb/host/ehci-tegra.c Change-Id: Ief6c03a63615a41e85de59ad14dedef309d0b2fb
Add UART_CAP_HW_CTSRTS flag to tegra type for supporting auto control of RTSCTS. Bug 803910 Change-Id: I7b69e4b203e66903ba5755338fcb55f4a87b9a43 Reviewed-on: http://git-master/r/24463 Tested-by: Pradeep Goudagunta <pgoudagunta@nvidia.com> Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com> Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Make sure that the last byte has been received by the uart during suspend after RTS is deasserted. Change-Id: I3517ec058fdca912ff5ad8770d2b1c5015385385 Signed-off-by: Andrei Warkentin <andreiw@motorola.com> Signed-off-by: Colin Cross <ccross@android.com>
Updates the tegra_hsuart driver to match the changes in the Tegra dma engine. Change-Id: Iaaf8770166156c1a6d889a6a11bae517626781ee Signed-off-by: Colin Cross <ccross@android.com>
tx_bytes might contain amount of bytes which should be transmitted after next "tx empty" interrupt. If we clear xmit circular buffer, tx_bytes should also be set to 0, otherwise it will lead to crash in fill_tx_fifo. Bug 794635 Change-Id: Ia34aba33dd09730c8f91d19e5c103cf1060a357e Reviewed-on: http://git-master/r/21844 Reviewed-by: Varun Colbert <vcolbert@nvidia.com> Tested-by: Varun Colbert <vcolbert@nvidia.com>
Conflicts: arch/arm/mach-tegra/include/mach/system.h arch/arm/mach-tegra/include/mach/usb_phy.h arch/arm/mach-tegra/usb_phy.c drivers/usb/host/ehci-tegra.c drivers/video/tegra/dc/dc.c drivers/video/tegra/dc/hdmi.c include/linux/tegra_usb.h Change-Id: Ic1f4f2b360893e8de6b867a8ecc239aca02367da