This patch addresses inconsistencies in Mac framebuffer drivers and their use of Kconfig symbols relating to NVRAM, so PPC64 can use CONFIG_NVRAM.
Macintosh framebuffer drivers use default settings for color mode and video mode that are found in NVRAM. On PCI Macs, MacOS stores display settings in the Name Registry (NR) partition in NVRAM*. On NuBus Macs, there is no NR partition and MacOS stores display mode settings in PRAM**. Early model Macs are the ones most likely to benefit from these settings, since they are more likely to have one display: a fixed-frequency monitor connected to the built-in framebuffer device. Moreover, a single NV_CMODE value and a single NV_VMODE value provide for only one display. The NV_CMODE and NV_VMODE constants are apparently offsets into the NR partition for Old World machines and not New World, which also suggests that these defaults are not useful on later models. All this argues for limiting NVRAM support in PowerMac fbdev drivers to PPC32 and indeed this is already the case, since CONFIG_NVRAM cannot be enabled on PPC64 at present. For matroxfb, make the CONFIG_PPC32 condition explicit. That way the driver won't crash on PPC64 when CONFIG_NVRAM becomes available there. In imsttfb, add the missing CONFIG_NVRAM test to prevent a build failure, since PPC64 does not implement nvram_read_byte(). Also add a missing machine_is(powermac) check. Change the inconsistent CONFIG_PPC dependency and the matching #ifdef tests to CONFIG_PPC_PMAC. Drop unused #includes. In valkyriefb, for clarity and consistency with the other PowerMac fbdev drivers, test for CONFIG_PPC_PMAC instead of !CONFIG_MAC. Remove a bogus comment regarding PRAM. * See GetPreferredConfiguration and SavePreferredConfiguration in "Designing PCI Cards and Drivers for Power Macintosh Computers". ** See SetDefaultMode and GetDefaultMode in "Designing Cards and Drivers for the Macintosh Family". Signed-off-by: Finn Thain <fth...@telegraphics.com.au> --- drivers/video/fbdev/Kconfig | 2 +- drivers/video/fbdev/imsttfb.c | 13 +++++-------- drivers/video/fbdev/matrox/matroxfb_base.c | 2 +- drivers/video/fbdev/valkyriefb.c | 14 ++++++-------- 4 files changed, 13 insertions(+), 18 deletions(-) Index: linux/drivers/video/fbdev/Kconfig =================================================================== --- linux.orig/drivers/video/fbdev/Kconfig 2015-07-25 17:42:34.000000000 +1000 +++ linux/drivers/video/fbdev/Kconfig 2015-07-25 17:45:44.000000000 +1000 @@ -544,7 +544,7 @@ config FB_IMSTT bool "IMS Twin Turbo display support" depends on (FB = y) && PCI select FB_CFB_IMAGEBLIT - select FB_MACMODES if PPC + select FB_MACMODES if PPC_PMAC help The IMS Twin Turbo is a PCI-based frame buffer card bundled with many Macintosh and compatible computers. Index: linux/drivers/video/fbdev/imsttfb.c =================================================================== --- linux.orig/drivers/video/fbdev/imsttfb.c 2015-07-25 17:42:34.000000000 +1000 +++ linux/drivers/video/fbdev/imsttfb.c 2015-07-25 17:45:44.000000000 +1000 @@ -30,10 +30,8 @@ #include <asm/io.h> #include <linux/uaccess.h> -#if defined(CONFIG_PPC) +#if defined(CONFIG_PPC_PMAC) #include <linux/nvram.h> -#include <asm/prom.h> -#include <asm/pci-bridge.h> #include "macmodes.h" #endif @@ -328,14 +326,13 @@ enum { TVP = 1 }; -#define USE_NV_MODES 1 #define INIT_BPP 8 #define INIT_XRES 640 #define INIT_YRES 480 static int inverse = 0; static char fontname[40] __initdata = { 0 }; -#if defined(CONFIG_PPC) +#if defined(CONFIG_PPC_PMAC) static signed char init_vmode = -1, init_cmode = -1; #endif @@ -1391,8 +1388,8 @@ static void init_imstt(struct fb_info *i } } -#if USE_NV_MODES && defined(CONFIG_PPC32) - { +#if defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32) && defined(CONFIG_NVRAM) + if (machine_is(powermac)) { int vmode = init_vmode, cmode = init_cmode; if (vmode == -1) { @@ -1566,7 +1563,7 @@ imsttfb_setup(char *options) inverse = 1; fb_invert_cmaps(); } -#if defined(CONFIG_PPC) +#if defined(CONFIG_PPC_PMAC) else if (!strncmp(this_opt, "vmode:", 6)) { int vmode = simple_strtoul(this_opt+6, NULL, 0); if (vmode > 0 && vmode <= VMODE_MAX) Index: linux/drivers/video/fbdev/matrox/matroxfb_base.c =================================================================== --- linux.orig/drivers/video/fbdev/matrox/matroxfb_base.c 2015-07-25 17:45:38.000000000 +1000 +++ linux/drivers/video/fbdev/matrox/matroxfb_base.c 2015-07-25 17:45:44.000000000 +1000 @@ -1876,7 +1876,7 @@ static int initMatrox2(struct matrox_fb_ struct fb_var_screeninfo var; if (default_vmode <= 0 || default_vmode > VMODE_MAX) default_vmode = VMODE_640_480_60; -#ifdef CONFIG_NVRAM +#if defined(CONFIG_PPC32) && defined(CONFIG_NVRAM) if (default_cmode == CMODE_NVRAM) default_cmode = nvram_read_byte(NV_CMODE); #endif Index: linux/drivers/video/fbdev/valkyriefb.c =================================================================== --- linux.orig/drivers/video/fbdev/valkyriefb.c 2015-07-25 17:42:34.000000000 +1000 +++ linux/drivers/video/fbdev/valkyriefb.c 2015-07-25 17:45:44.000000000 +1000 @@ -65,14 +65,12 @@ #include "macmodes.h" #include "valkyriefb.h" -#ifdef CONFIG_MAC -/* We don't yet have functions to read the PRAM... perhaps we can - adapt them from the PPC code? */ -static int default_vmode = VMODE_CHOOSE; -static int default_cmode = CMODE_8; -#else +#ifdef CONFIG_PPC_PMAC static int default_vmode = VMODE_NVRAM; static int default_cmode = CMODE_NVRAM; +#else +static int default_vmode = VMODE_CHOOSE; +static int default_cmode = CMODE_8; #endif struct fb_par_valkyrie { @@ -285,7 +283,7 @@ static void __init valkyrie_choose_mode( printk(KERN_INFO "Monitor sense value = 0x%x\n", p->sense); /* Try to pick a video mode out of NVRAM if we have one. */ -#if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM) +#if defined(CONFIG_PPC_PMAC) && defined(CONFIG_NVRAM) if (default_vmode == VMODE_NVRAM) { default_vmode = nvram_read_byte(NV_VMODE); if (default_vmode <= 0 @@ -298,7 +296,7 @@ static void __init valkyrie_choose_mode( default_vmode = mac_map_monitor_sense(p->sense); if (!valkyrie_reg_init[default_vmode - 1]) default_vmode = VMODE_640_480_67; -#if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM) +#if defined(CONFIG_PPC_PMAC) && defined(CONFIG_NVRAM) if (default_cmode == CMODE_NVRAM) default_cmode = nvram_read_byte(NV_CMODE); #endif _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev