[PATCH 07/33] efi/gop: Get mode information outside the loop

Ard Biesheuvel
2020-04-24T13:06:33Z

From: Arvind Sankar <nivedita@alum.mit.edu>

Move extraction of the mode information parameters outside the loop to
find the gop, and eliminate some redundant variables.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20200320020028.1936003-4-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
drivers/firmware/efi/libstub/gop.c | 38 +++++++++++-------------------
1 file changed, 14 insertions(+), 24 deletions(-)

diff --git a/drivers/firmware/efi/libstub/gop.c b/drivers/firmware/efi/libstub/gop.c
index 201b66970b2b..d692b8c65813 100644
--- a/drivers/firmware/efi/libstub/gop.c
+++ b/drivers/firmware/efi/libstub/gop.c
@@ -89,12 +89,9 @@ static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
unsigned long size, void **handles)
{
efi_graphics_output_protocol_t *gop, *first_gop;
- u16 width, height;
- u32 pixels_per_scan_line;
- u32 ext_lfb_base;
+ efi_graphics_output_protocol_mode_t *mode;
+ efi_graphics_output_mode_info_t *info = NULL;
efi_physical_addr_t fb_base;
- efi_pixel_bitmask_t pixel_info;
- int pixel_format;
efi_status_t status;
efi_handle_t h;
int i;
@@ -103,8 +100,6 @@ static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
gop = NULL;

for_each_efi_handle(h, handles, size, i) {
- efi_graphics_output_protocol_mode_t *mode;
- efi_graphics_output_mode_info_t *info = NULL;
efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
bool conout_found = false;
void *dummy = NULL;
@@ -129,15 +124,7 @@ static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
* backed by real hardware. The workaround is to search
* for a GOP implementing the ConOut protocol, and if
* one isn't found, to just fall back to the first GOP.
- */
- width = info->horizontal_resolution;
- height = info->vertical_resolution;
- pixel_format = info->pixel_format;
- pixel_info = info->pixel_information;
- pixels_per_scan_line = info->pixels_per_scan_line;
- fb_base = efi_table_attr(mode, frame_buffer_base);
-
- /*
+ *
* Once we've found a GOP supporting ConOut,
* don't bother looking any further.
*/
@@ -152,21 +139,24 @@ static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
return EFI_NOT_FOUND;

/* EFI framebuffer */
+ mode = efi_table_attr(first_gop, mode);
+ info = efi_table_attr(mode, info);
+
si->orig_video_isVGA = VIDEO_TYPE_EFI;

- si->lfb_width = width;
- si->lfb_height = height;
- si->lfb_base = fb_base;
+ si->lfb_width = info->horizontal_resolution;
+ si->lfb_height = info->vertical_resolution;

- ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
- if (ext_lfb_base) {
+ fb_base = efi_table_attr(mode, frame_buffer_base);
+ si->lfb_base = fb_base;
+ si->ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
+ if (si->ext_lfb_base)
si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
- si->ext_lfb_base = ext_lfb_base;
- }

si->pages = 1;

- setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
+ setup_pixel_info(si, info->pixels_per_scan_line,
+ info->pixel_information, info->pixel_format);

si->lfb_size = si->lfb_linelength * si->lfb_height;

--
2.17.1