diff options
Diffstat (limited to 'src/soc/mediatek/common/dsi.c')
| -rw-r--r-- | src/soc/mediatek/common/dsi.c | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/src/soc/mediatek/common/dsi.c b/src/soc/mediatek/common/dsi.c index 92a645682e..12d536b497 100644 --- a/src/soc/mediatek/common/dsi.c +++ b/src/soc/mediatek/common/dsi.c @@ -37,6 +37,33 @@ static unsigned int mtk_dsi_get_bits_per_pixel(u32 format) return 24; } +static int mtk_dsi_get_data_rate(u32 bits_per_pixel, u32 lanes, + const struct edid *edid) +{ + /* data_rate = pixel_clock * bits_per_pixel * mipi_ratio / lanes + * Note pixel_clock comes in kHz and returned data_rate is in Mbps. + * mipi_ratio is the clk coefficient to balance the pixel clk in MIPI + * for older platforms which do not have complete implementation in HFP. + * Newer platforms should just set that to 1.0 (100 / 100). + */ + int data_rate = (u64)edid->mode.pixel_clock * bits_per_pixel * + MTK_DSI_MIPI_RATIO_NUMERATOR / + (1000 * lanes * MTK_DSI_MIPI_RATIO_DENOMINATOR); + printk(BIOS_INFO, "DSI data_rate: %d Mbps\n", data_rate); + + if (data_rate < MTK_DSI_DATA_RATE_MIN_MHZ) { + printk(BIOS_ERR, "data rate (%dMbps) must be >=%dMbps. " + "Please check the pixel clock (%u), bits per pixel(%u), " + "mipi_ratio (%d%%) and number of lanes (%d)\n", + data_rate, MTK_DSI_DATA_RATE_MIN_MHZ, + edid->mode.pixel_clock, bits_per_pixel, + (100 * MTK_DSI_MIPI_RATIO_NUMERATOR / + MTK_DSI_MIPI_RATIO_DENOMINATOR), lanes); + return -1; + } + return data_rate; +} + static void mtk_dsi_phy_timconfig(u32 data_rate) { u32 timcon0, timcon1, timcon2, timcon3; @@ -186,11 +213,11 @@ int mtk_dsi_init(u32 mode_flags, u32 format, u32 lanes, const struct edid *edid) int data_rate; u32 bits_per_pixel = mtk_dsi_get_bits_per_pixel(format); - data_rate = mtk_dsi_phy_clk_setting(bits_per_pixel, lanes, edid); - + data_rate = mtk_dsi_get_data_rate(bits_per_pixel, lanes, edid); if (data_rate < 0) return -1; + mtk_dsi_configure_mipi_tx(data_rate, lanes); mtk_dsi_reset(); mtk_dsi_phy_timconfig(data_rate); mtk_dsi_rxtx_control(mode_flags, lanes); |