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authorLinus Torvalds <torvalds@g5.osdl.org>2006-06-20 14:49:00 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-20 14:49:00 -0700
commitff9144530e9cfe8923e00172e3f8ff83c3b8ff8b (patch)
treec64a9528dde590b9f3174125ad361f46ee30bba8 /Documentation/arm/Sharp-LH/LCDPanels
parent25f42b6af09e34c3f92107b36b5aa6edc2fdba2f (diff)
parent96ce2385dd2817da549910001a69ac0a2762a1b9 (diff)
Merge master.kernel.org:/home/rmk/linux-2.6-arm
* master.kernel.org:/home/rmk/linux-2.6-arm: (22 commits) [ARM] 3559/1: S3C2442: core and serial port [ARM] 3557/1: S3C24XX: centralise and cleanup uart registration [ARM] 3558/1: SMDK24XX: LED platform devices [ARM] 3534/1: add spi support to lubbock platform [ARM] 3554/1: ARM: Fix dyntick locking [ARM] 3553/1: S3C24XX: earlier print of cpu idcode info [ARM] 3552/1: S3C24XX: Move VA of GPIO for low-level debug [ARM] 3551/1: S3C24XX: PM code failes to compile with CONFIG_DCACHE_WRITETHROUGH [ARM] 3550/1: OSIRIS: fix serial port map for 1:1 [ARM] 3548/1: Fix the ARMv6 CPU id in compressed/head.S [ARM] 3335/1: Old-abi Thumb sys_syscall broken [ARM] 3467/1: [3/3] Support for Philips PNX4008 platform: defconfig [ARM] 3466/1: [2/3] Support for Philips PNX4008 platform: chip support [ARM] 3465/1: [1/3] Support for Philips PNX4008 platform: headers [ARM] 3407/1: lpd7x: documetation update [ARM] 3406/1: lpd7x: compilation fix for smc91x [ARM] 3405/1: lpd7a40x: CPLD ssp driver [ARM] 3404/1: lpd7a40x: AMBA CLCD support [ARM] 3403/1: lpd7a40x: updated default configurations [ARM] 3402/1: lpd7a40x: serial driver bug fix ...
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+README on the LCD Panels
+========================
+
+Configuration options for several LCD panels, available from Logic PD,
+are included in the kernel source. This README will help you
+understand the configuration data and give you some guidance for
+adding support for other panels if you wish.
+
+
+lcd-panels.h
+------------
+
+There is no way, at present, to detect which panel is attached to the
+system at runtime. Thus the kernel configuration is static. The file
+arch/arm/mach-ld7a40x/lcd-panels.h (or similar) defines all of the
+panel specific parameters.
+
+It should be possible for this data to be shared among several device
+families. The current layout may be insufficiently general, but it is
+amenable to improvement.
+
+
+PIXEL_CLOCK
+-----------
+
+The panel data sheets will give a range of acceptable pixel clocks.
+The fundamental LCDCLK input frequency is divided down by a PCD
+constant in field '.tim2'. It may happen that it is impossible to set
+the pixel clock within this range. A clock which is too slow will
+tend to flicker. For the highest quality image, set the clock as high
+as possible.
+
+
+MARGINS
+-------
+
+These values may be difficult to glean from the panel data sheet. In
+the case of the Sharp panels, the upper margin is explicitly called
+out as a specific number of lines from the top of the frame. The
+other values may not matter as much as the panels tend to
+automatically center the image.
+
+
+Sync Sense
+----------
+
+The sense of the hsync and vsync pulses may be called out in the data
+sheet. On one panel, the sense of these pulses determine the height
+of the visible region on the panel. Most of the Sharp panels use
+negative sense sync pulses set by the TIM2_IHS and TIM2_IVS bits in
+'.tim2'.
+
+
+Pel Layout
+----------
+
+The Sharp color TFT panels are all configured for 16 bit direct color
+modes. The amba-lcd driver sets the pel mode to 565 for 5 bits of
+each red and blue and 6 bits of green.