LCOV - code coverage report
Current view: top level - arch/x86/kernel - sysfb_efi.c (source / functions) Hit Total Coverage
Test: combined.info Lines: 5 61 8.2 %
Date: 2022-04-01 14:58:12 Functions: 1 3 33.3 %
Branches: 2 64 3.1 %

           Branch data     Line data    Source code
       1                 :            : // SPDX-License-Identifier: GPL-2.0-or-later
       2                 :            : /*
       3                 :            :  * Generic System Framebuffers on x86
       4                 :            :  * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
       5                 :            :  *
       6                 :            :  * EFI Quirks Copyright (c) 2006 Edgar Hucek <gimli@dark-green.com>
       7                 :            :  */
       8                 :            : 
       9                 :            : /*
      10                 :            :  * EFI Quirks
      11                 :            :  * Several EFI systems do not correctly advertise their boot framebuffers.
      12                 :            :  * Hence, we use this static table of known broken machines and fix up the
      13                 :            :  * information so framebuffer drivers can load corectly.
      14                 :            :  */
      15                 :            : 
      16                 :            : #include <linux/dmi.h>
      17                 :            : #include <linux/err.h>
      18                 :            : #include <linux/efi.h>
      19                 :            : #include <linux/init.h>
      20                 :            : #include <linux/kernel.h>
      21                 :            : #include <linux/mm.h>
      22                 :            : #include <linux/pci.h>
      23                 :            : #include <linux/screen_info.h>
      24                 :            : #include <video/vga.h>
      25                 :            : 
      26                 :            : #include <asm/efi.h>
      27                 :            : #include <asm/sysfb.h>
      28                 :            : 
      29                 :            : enum {
      30                 :            :         OVERRIDE_NONE = 0x0,
      31                 :            :         OVERRIDE_BASE = 0x1,
      32                 :            :         OVERRIDE_STRIDE = 0x2,
      33                 :            :         OVERRIDE_HEIGHT = 0x4,
      34                 :            :         OVERRIDE_WIDTH = 0x8,
      35                 :            : };
      36                 :            : 
      37                 :            : struct efifb_dmi_info efifb_dmi_list[] = {
      38                 :            :         [M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
      39                 :            :         [M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE }, /* guess */
      40                 :            :         [M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE },
      41                 :            :         [M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE }, /* guess */
      42                 :            :         [M_I24_8_1] = { "imac8", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
      43                 :            :         [M_I24_10_1] = { "imac10", 0xc0010000, 2048 * 4, 1920, 1080, OVERRIDE_NONE },
      44                 :            :         [M_I27_11_1] = { "imac11", 0xc0010000, 2560 * 4, 2560, 1440, OVERRIDE_NONE },
      45                 :            :         [M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768, OVERRIDE_NONE },
      46                 :            :         [M_MINI_3_1] = { "mini31", 0x40010000, 1024 * 4, 1024, 768, OVERRIDE_NONE },
      47                 :            :         [M_MINI_4_1] = { "mini41", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
      48                 :            :         [M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
      49                 :            :         [M_MB_5_1] = { "macbook51", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
      50                 :            :         [M_MB_6_1] = { "macbook61", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
      51                 :            :         [M_MB_7_1] = { "macbook71", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
      52                 :            :         [M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
      53                 :            :         /* 11" Macbook Air 3,1 passes the wrong stride */
      54                 :            :         [M_MBA_3] = { "mba3", 0, 2048 * 4, 0, 0, OVERRIDE_STRIDE },
      55                 :            :         [M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
      56                 :            :         [M_MBP_2] = { "mbp2", 0, 0, 0, 0, OVERRIDE_NONE }, /* placeholder */
      57                 :            :         [M_MBP_2_2] = { "mbp22", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
      58                 :            :         [M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
      59                 :            :         [M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
      60                 :            :         [M_MBP_5_1] = { "mbp51", 0xc0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
      61                 :            :         [M_MBP_5_2] = { "mbp52", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
      62                 :            :         [M_MBP_5_3] = { "mbp53", 0xd0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
      63                 :            :         [M_MBP_6_1] = { "mbp61", 0x90030000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
      64                 :            :         [M_MBP_6_2] = { "mbp62", 0x90030000, 2048 * 4, 1680, 1050, OVERRIDE_NONE },
      65                 :            :         [M_MBP_7_1] = { "mbp71", 0xc0010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
      66                 :            :         [M_MBP_8_2] = { "mbp82", 0x90010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
      67                 :            :         [M_UNKNOWN] = { NULL, 0, 0, 0, 0, OVERRIDE_NONE }
      68                 :            : };
      69                 :            : 
      70                 :          0 : void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
      71                 :            : {
      72                 :          0 :         int i;
      73                 :            : 
      74         [ #  # ]:          0 :         for (i = 0; i < M_UNKNOWN; i++) {
      75         [ #  # ]:          0 :                 if (efifb_dmi_list[i].base != 0 &&
      76         [ #  # ]:          0 :                     !strcmp(opt, efifb_dmi_list[i].optname)) {
      77                 :          0 :                         si->lfb_base = efifb_dmi_list[i].base;
      78                 :          0 :                         si->lfb_linelength = efifb_dmi_list[i].stride;
      79                 :          0 :                         si->lfb_width = efifb_dmi_list[i].width;
      80                 :          0 :                         si->lfb_height = efifb_dmi_list[i].height;
      81                 :            :                 }
      82                 :            :         }
      83                 :          0 : }
      84                 :            : 
      85                 :            : #define choose_value(dmivalue, fwvalue, field, flags) ({        \
      86                 :            :                 typeof(fwvalue) _ret_ = fwvalue;                \
      87                 :            :                 if ((flags) & (field))                              \
      88                 :            :                         _ret_ = dmivalue;                       \
      89                 :            :                 else if ((fwvalue) == 0)                        \
      90                 :            :                         _ret_ = dmivalue;                       \
      91                 :            :                 _ret_;                                          \
      92                 :            :         })
      93                 :            : 
      94                 :          0 : static int __init efifb_set_system(const struct dmi_system_id *id)
      95                 :            : {
      96                 :          0 :         struct efifb_dmi_info *info = id->driver_data;
      97                 :            : 
      98   [ #  #  #  #  :          0 :         if (info->base == 0 && info->height == 0 && info->width == 0 &&
                   #  # ]
      99                 :            :             info->stride == 0)
     100                 :            :                 return 0;
     101                 :            : 
     102                 :            :         /* Trust the bootloader over the DMI tables */
     103         [ #  # ]:          0 :         if (screen_info.lfb_base == 0) {
     104                 :            : #if defined(CONFIG_PCI)
     105                 :          0 :                 struct pci_dev *dev = NULL;
     106                 :          0 :                 int found_bar = 0;
     107                 :            : #endif
     108         [ #  # ]:          0 :                 if (info->base) {
     109         [ #  # ]:          0 :                         screen_info.lfb_base = choose_value(info->base,
     110                 :            :                                 screen_info.lfb_base, OVERRIDE_BASE,
     111                 :            :                                 info->flags);
     112                 :            : 
     113                 :            : #if defined(CONFIG_PCI)
     114                 :            :                         /* make sure that the address in the table is actually
     115                 :            :                          * on a VGA device's PCI BAR */
     116                 :            : 
     117         [ #  # ]:          0 :                         for_each_pci_dev(dev) {
     118                 :          0 :                                 int i;
     119         [ #  # ]:          0 :                                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
     120                 :          0 :                                         continue;
     121         [ #  # ]:          0 :                                 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
     122                 :          0 :                                         resource_size_t start, end;
     123                 :          0 :                                         unsigned long flags;
     124                 :            : 
     125                 :          0 :                                         flags = pci_resource_flags(dev, i);
     126         [ #  # ]:          0 :                                         if (!(flags & IORESOURCE_MEM))
     127                 :          0 :                                                 continue;
     128                 :            : 
     129         [ #  # ]:          0 :                                         if (flags & IORESOURCE_UNSET)
     130                 :          0 :                                                 continue;
     131                 :            : 
     132   [ #  #  #  #  :          0 :                                         if (pci_resource_len(dev, i) == 0)
                   #  # ]
     133                 :          0 :                                                 continue;
     134                 :            : 
     135                 :          0 :                                         start = pci_resource_start(dev, i);
     136                 :          0 :                                         end = pci_resource_end(dev, i);
     137   [ #  #  #  # ]:          0 :                                         if (screen_info.lfb_base >= start &&
     138                 :            :                                             screen_info.lfb_base < end) {
     139                 :            :                                                 found_bar = 1;
     140                 :            :                                                 break;
     141                 :            :                                         }
     142                 :            :                                 }
     143                 :            :                         }
     144         [ #  # ]:          0 :                         if (!found_bar)
     145                 :          0 :                                 screen_info.lfb_base = 0;
     146                 :            : #endif
     147                 :            :                 }
     148                 :            :         }
     149         [ #  # ]:          0 :         if (screen_info.lfb_base) {
     150   [ #  #  #  # ]:          0 :                 screen_info.lfb_linelength = choose_value(info->stride,
     151                 :            :                         screen_info.lfb_linelength, OVERRIDE_STRIDE,
     152                 :            :                         info->flags);
     153   [ #  #  #  # ]:          0 :                 screen_info.lfb_width = choose_value(info->width,
     154                 :            :                         screen_info.lfb_width, OVERRIDE_WIDTH,
     155                 :            :                         info->flags);
     156   [ #  #  #  # ]:          0 :                 screen_info.lfb_height = choose_value(info->height,
     157                 :            :                         screen_info.lfb_height, OVERRIDE_HEIGHT,
     158                 :            :                         info->flags);
     159         [ #  # ]:          0 :                 if (screen_info.orig_video_isVGA == 0)
     160                 :          0 :                         screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;
     161                 :            :         } else {
     162                 :          0 :                 screen_info.lfb_linelength = 0;
     163                 :          0 :                 screen_info.lfb_width = 0;
     164                 :          0 :                 screen_info.lfb_height = 0;
     165                 :          0 :                 screen_info.orig_video_isVGA = 0;
     166                 :          0 :                 return 0;
     167                 :            :         }
     168                 :            : 
     169                 :          0 :         printk(KERN_INFO "efifb: dmi detected %s - framebuffer at 0x%08x "
     170                 :            :                          "(%dx%d, stride %d)\n", id->ident,
     171                 :            :                          screen_info.lfb_base, screen_info.lfb_width,
     172                 :            :                          screen_info.lfb_height, screen_info.lfb_linelength);
     173                 :            : 
     174                 :          0 :         return 1;
     175                 :            : }
     176                 :            : 
     177                 :            : #define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid)               \
     178                 :            :         {                                                       \
     179                 :            :                 efifb_set_system,                               \
     180                 :            :                 name,                                           \
     181                 :            :                 {                                               \
     182                 :            :                         DMI_MATCH(DMI_BIOS_VENDOR, vendor),     \
     183                 :            :                         DMI_MATCH(DMI_PRODUCT_NAME, name)       \
     184                 :            :                 },                                              \
     185                 :            :                 &efifb_dmi_list[enumid]                             \
     186                 :            :         }
     187                 :            : 
     188                 :            : static const struct dmi_system_id efifb_dmi_system_table[] __initconst = {
     189                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),
     190                 :            :         /* At least one of these two will be right; maybe both? */
     191                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),
     192                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),
     193                 :            :         /* At least one of these two will be right; maybe both? */
     194                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),
     195                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),
     196                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),
     197                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac8,1", M_I24_8_1),
     198                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac10,1", M_I24_10_1),
     199                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac11,1", M_I27_11_1),
     200                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
     201                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini3,1", M_MINI_3_1),
     202                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini4,1", M_MINI_4_1),
     203                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),
     204                 :            :         /* At least one of these two will be right; maybe both? */
     205                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),
     206                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),
     207                 :            :         /* At least one of these two will be right; maybe both? */
     208                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),
     209                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),
     210                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),
     211                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook5,1", M_MB_5_1),
     212                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook6,1", M_MB_6_1),
     213                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook7,1", M_MB_7_1),
     214                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
     215                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir3,1", M_MBA_3),
     216                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),
     217                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),
     218                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,2", M_MBP_2_2),
     219                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),
     220                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),
     221                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),
     222                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),
     223                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,1", M_MBP_5_1),
     224                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,2", M_MBP_5_2),
     225                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,3", M_MBP_5_3),
     226                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,1", M_MBP_6_1),
     227                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,2", M_MBP_6_2),
     228                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro7,1", M_MBP_7_1),
     229                 :            :         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro8,2", M_MBP_8_2),
     230                 :            :         {},
     231                 :            : };
     232                 :            : 
     233                 :            : /*
     234                 :            :  * Some devices have a portrait LCD but advertise a landscape resolution (and
     235                 :            :  * pitch). We simply swap width and height for these devices so that we can
     236                 :            :  * correctly deal with some of them coming with multiple resolutions.
     237                 :            :  */
     238                 :            : static const struct dmi_system_id efifb_dmi_swap_width_height[] __initconst = {
     239                 :            :         {
     240                 :            :                 /*
     241                 :            :                  * Lenovo MIIX310-10ICR, only some batches have the troublesome
     242                 :            :                  * 800x1280 portrait screen. Luckily the portrait version has
     243                 :            :                  * its own BIOS version, so we match on that.
     244                 :            :                  */
     245                 :            :                 .matches = {
     246                 :            :                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
     247                 :            :                         DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "MIIX 310-10ICR"),
     248                 :            :                         DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1HCN44WW"),
     249                 :            :                 },
     250                 :            :         },
     251                 :            :         {
     252                 :            :                 /* Lenovo MIIX 320-10ICR with 800x1280 portrait screen */
     253                 :            :                 .matches = {
     254                 :            :                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
     255                 :            :                         DMI_EXACT_MATCH(DMI_PRODUCT_VERSION,
     256                 :            :                                         "Lenovo MIIX 320-10ICR"),
     257                 :            :                 },
     258                 :            :         },
     259                 :            :         {
     260                 :            :                 /* Lenovo D330 with 800x1280 or 1200x1920 portrait screen */
     261                 :            :                 .matches = {
     262                 :            :                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
     263                 :            :                         DMI_EXACT_MATCH(DMI_PRODUCT_VERSION,
     264                 :            :                                         "Lenovo ideapad D330-10IGM"),
     265                 :            :                 },
     266                 :            :         },
     267                 :            :         {},
     268                 :            : };
     269                 :            : 
     270                 :          3 : __init void sysfb_apply_efi_quirks(void)
     271                 :            : {
     272         [ -  + ]:          3 :         if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI ||
     273         [ #  # ]:          0 :             !(screen_info.capabilities & VIDEO_CAPABILITY_SKIP_QUIRKS))
     274                 :          3 :                 dmi_check_system(efifb_dmi_system_table);
     275                 :            : 
     276   [ -  +  -  - ]:          3 :         if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
     277                 :          0 :             dmi_check_system(efifb_dmi_swap_width_height)) {
     278                 :          0 :                 u16 temp = screen_info.lfb_width;
     279                 :            : 
     280                 :          0 :                 screen_info.lfb_width = screen_info.lfb_height;
     281                 :          0 :                 screen_info.lfb_height = temp;
     282                 :          0 :                 screen_info.lfb_linelength = 4 * screen_info.lfb_width;
     283                 :            :         }
     284                 :          3 : }

Generated by: LCOV version 1.14