diff options
| author | Max Filippov <jcmvbkbc@gmail.com> | 2015-02-27 06:28:00 +0300 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2015-06-28 13:39:15 -0400 |
| commit | 3d96a48ac855e5491fbd54b23664e2b2b9ce64b5 (patch) | |
| tree | f40dd57ea3ebd6bf14b2d22f6c60e45fb996ed7c /arch | |
| parent | 5c849cf547bc4042adf48d5297d4db31ce7af6d1 (diff) | |
xtensa: xtfpga: fix hardware lockup caused by LCD driver
[ Upstream commit 4949009eb8d40a441dcddcd96e101e77d31cf1b2 ]
LCD driver is always built for the XTFPGA platform, but its base address
is not configurable, and is wrong for ML605/KC705. Its initialization
locks up KC705 board hardware.
Make the whole driver optional, and its base address and bus width
configurable. Implement 4-bit bus access method.
Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/xtensa/Kconfig | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index 73d328f480e5..e28ef29b0b16 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -436,6 +436,36 @@ config XTFPGA_LCD_8BIT_ACCESS only be used with 8-bit interface. Please consult prototyping user guide for your board for the correct interface width. +config XTFPGA_LCD + bool "Enable XTFPGA LCD driver" + depends on XTENSA_PLATFORM_XTFPGA + default n + help + There's a 2x16 LCD on most of XTFPGA boards, kernel may output + progress messages there during bootup/shutdown. It may be useful + during board bringup. + + If unsure, say N. + +config XTFPGA_LCD_BASE_ADDR + hex "XTFPGA LCD base address" + depends on XTFPGA_LCD + default "0x0d0c0000" + help + Base address of the LCD controller inside KIO region. + Different boards from XTFPGA family have LCD controller at different + addresses. Please consult prototyping user guide for your board for + the correct address. Wrong address here may lead to hardware lockup. + +config XTFPGA_LCD_8BIT_ACCESS + bool "Use 8-bit access to XTFPGA LCD" + depends on XTFPGA_LCD + default n + help + LCD may be connected with 4- or 8-bit interface, 8-bit access may + only be used with 8-bit interface. Please consult prototyping user + guide for your board for the correct interface width. + endmenu menu "Executable file formats" |