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authorJacob Garber <jgarber1@ualberta.ca>2019-07-22 18:31:30 -0600
committerPatrick Georgi <pgeorgi@google.com>2019-08-02 10:00:09 +0000
commit9904905b488cdc1e14cdae34c6040f2e9496c06f (patch)
treeda60a3eac4291f077a29a121c0b0a253dc6d9faf /src/soc/samsung
parentb2e75d2d1d410dd432f74e4cd46c3ee7fb9d512a (diff)
downloadcoreboot-9904905b488cdc1e14cdae34c6040f2e9496c06f.tar.xz
soc/samsung/exynos5420: Refactor fimd vidtcon access
Accessing the higher vidtcon variables using pointer arithmetic from the lower address FIMD_CTRL struct is undefined behaviour, since pointers manipulations are not allowed outside the objects they point to. The standard-blessed way is to perform the arithmetic using integer addresses first, and then convert that to a pointer. The end result is the same, but avoids the risk of unsafe optimizations from an over-zealous compiler. Signed-off-by: Jacob Garber <jgarber1@ualberta.ca> Found-by: Coverity CID 1402096, 1402124, 1402131, 1402169 Change-Id: I13ed23836e8e9076ae0bfd88c05c4f2badac9c49 Reviewed-on: https://review.coreboot.org/c/coreboot/+/34633 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Julius Werner <jwerner@chromium.org>
Diffstat (limited to 'src/soc/samsung')
-rw-r--r--src/soc/samsung/exynos5420/fimd.c13
-rw-r--r--src/soc/samsung/exynos5420/include/soc/dp.h5
-rw-r--r--src/soc/samsung/exynos5420/include/soc/fimd.h3
3 files changed, 9 insertions, 12 deletions
diff --git a/src/soc/samsung/exynos5420/fimd.c b/src/soc/samsung/exynos5420/fimd.c
index 756d2fba54..2b3552abdd 100644
--- a/src/soc/samsung/exynos5420/fimd.c
+++ b/src/soc/samsung/exynos5420/fimd.c
@@ -317,9 +317,10 @@ static void exynos5_set_system_display(void)
void exynos_fimd_lcd_init(vidinfo_t *vid)
{
unsigned int cfg = 0, rgb_mode;
- unsigned int offset;
+ struct exynos_fb *fimd;
+
+ fimd = (void *)(FIMD_CTRL_ADDR + EXYNOS5_LCD_IF_BASE_OFFSET);
- offset = exynos_fimd_get_base_offset();
printk(BIOS_SPEW, "%s\n", __func__);
exynos5_set_system_display();
@@ -349,19 +350,19 @@ void exynos_fimd_lcd_init(vidinfo_t *vid)
if (!vid->vl_dp)
cfg |= EXYNOS_VIDCON1_IVDEN_INVERT;
- lwritel(cfg, &FIMD_CTRL->vidcon1 + offset);
+ lwritel(cfg, &fimd->vidcon1);
/* set timing */
cfg = EXYNOS_VIDTCON0_VFPD(vid->vl_vfpd - 1);
cfg |= EXYNOS_VIDTCON0_VBPD(vid->vl_vbpd - 1);
cfg |= EXYNOS_VIDTCON0_VSPW(vid->vl_vspw - 1);
- lwritel(cfg, &FIMD_CTRL->vidtcon0 + offset);
+ lwritel(cfg, &fimd->vidtcon0);
cfg = EXYNOS_VIDTCON1_HFPD(vid->vl_hfpd - 1);
cfg |= EXYNOS_VIDTCON1_HBPD(vid->vl_hbpd - 1);
cfg |= EXYNOS_VIDTCON1_HSPW(vid->vl_hspw - 1);
- lwritel(cfg, &FIMD_CTRL->vidtcon1 + offset);
+ lwritel(cfg, &fimd->vidtcon1);
/* set lcd size */
cfg = EXYNOS_VIDTCON2_HOZVAL(vid->vl_col - 1) |
@@ -369,7 +370,7 @@ void exynos_fimd_lcd_init(vidinfo_t *vid)
EXYNOS_VIDTCON2_HOZVAL_E(vid->vl_col - 1) |
EXYNOS_VIDTCON2_LINEVAL_E(vid->vl_row - 1);
- lwritel(cfg, &FIMD_CTRL->vidtcon2 + offset);
+ lwritel(cfg, &fimd->vidtcon2);
}
/* set display mode */
diff --git a/src/soc/samsung/exynos5420/include/soc/dp.h b/src/soc/samsung/exynos5420/include/soc/dp.h
index 28db73a019..6b33a76294 100644
--- a/src/soc/samsung/exynos5420/include/soc/dp.h
+++ b/src/soc/samsung/exynos5420/include/soc/dp.h
@@ -884,11 +884,6 @@ struct exynos_fb {
/* LCD IF register offset */
#define EXYNOS5_LCD_IF_BASE_OFFSET 0x20000
-static inline u32 exynos_fimd_get_base_offset(void)
-{
- return EXYNOS5_LCD_IF_BASE_OFFSET/4;
-}
-
/*
* Register offsets
*/
diff --git a/src/soc/samsung/exynos5420/include/soc/fimd.h b/src/soc/samsung/exynos5420/include/soc/fimd.h
index d9d86cbfae..3e9d6a44f5 100644
--- a/src/soc/samsung/exynos5420/include/soc/fimd.h
+++ b/src/soc/samsung/exynos5420/include/soc/fimd.h
@@ -136,7 +136,8 @@ check_member(exynos5_disp_ctrl, trigcon, 0x1a4);
#define OSD_RIGHTBOTX_F_OFFSET 11
#define OSD_RIGHTBOTY_F_OFFSET 0
-#define FIMD_CTRL ((struct exynos_fb *)0x14400000)
+#define FIMD_CTRL_ADDR 0x14400000
+#define FIMD_CTRL ((struct exynos_fb *)FIMD_CTRL_ADDR)
/* from u-boot fb.h. It needs to be merged with these dp structs maybe. */
enum {