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-rw-r--r--src/soc/mediatek/common/dsi.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/src/soc/mediatek/common/dsi.c b/src/soc/mediatek/common/dsi.c
index 3b9acd0ddc..73dacef33b 100644
--- a/src/soc/mediatek/common/dsi.c
+++ b/src/soc/mediatek/common/dsi.c
@@ -10,6 +10,9 @@
#include <string.h>
#include <timer.h>
+#define MIN_HFP_BYTE 2
+#define MIN_HBP_BYTE 2
+
static unsigned int mtk_dsi_get_bits_per_pixel(u32 format)
{
switch (format) {
@@ -165,8 +168,8 @@ static void mtk_dsi_config_vdo_timing(u32 mode_flags, u32 format, u32 lanes,
u32 hsync_active_byte;
u32 hbp;
u32 hfp;
- u32 hbp_byte;
- u32 hfp_byte;
+ s32 hbp_byte;
+ s32 hfp_byte;
u32 vbp_byte;
u32 vfp_byte;
u32 bytes_per_pixel;
@@ -215,6 +218,21 @@ static void mtk_dsi_config_vdo_timing(u32 mode_flags, u32 format, u32 lanes,
"the panel may not work properly.\n");
}
+ if (hfp_byte + hbp_byte < MIN_HFP_BYTE + MIN_HBP_BYTE) {
+ printk(BIOS_ERR, "Calculated hfp_byte and hbp_byte are too small, "
+ "the panel may not work properly.\n");
+ } else if (hfp_byte < MIN_HFP_BYTE) {
+ printk(BIOS_NOTICE, "Calculated hfp_byte is too small, "
+ "adjust it to the minimum value.\n");
+ hbp_byte -= MIN_HFP_BYTE - hfp_byte;
+ hfp_byte = MIN_HFP_BYTE;
+ } else if (hbp_byte < MIN_HBP_BYTE) {
+ printk(BIOS_NOTICE, "Calculated hbp_byte is too small, "
+ "adjust it to the minimum value.\n");
+ hfp_byte -= MIN_HBP_BYTE - hbp_byte;
+ hbp_byte = MIN_HBP_BYTE;
+ }
+
write32(&dsi0->dsi_hsa_wc, hsync_active_byte);
write32(&dsi0->dsi_hbp_wc, hbp_byte);
write32(&dsi0->dsi_hfp_wc, hfp_byte);