Tune dsi frame rate by pixel clock, dsi add some extra signal (i.e. Tlpx, Ths-prepare, Ths-zero, Ths-trail,Ths-exit) when enter and exit LP mode, this signal will cause h-time larger than normal and reduce FPS. Need to multiply a coefficient to offset the extra signal's effect. coefficient = ((htotal*bpp/lane_number)+Tlpx+Ths_prep+Ths_zero+Ths_trail+ Ths_exit)/(htotal*bpp/lane_number)) Signed-off-by: Jitao Shi <jitao.shi@xxxxxxxxxxxx> --- Change since v2: - move phy timing back to dsi_phy_timconfig. Change since v1: - phy_timing2 and phy_timing3 refer clock cycle time. - define values of LPX HS_PRPR HS_ZERO HS_TRAIL TA_GO TA_SURE TA_GET DA_HS_EXIT --- drivers/gpu/drm/mediatek/mtk_dsi.c | 74 +++++++++++++++++++++++++----------- 1 file changed, 51 insertions(+), 23 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c index 28b2044..8b3b38a 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c @@ -85,16 +85,16 @@ #define LD0_WAKEUP_EN BIT(2) #define DSI_PHY_TIMECON0 0x110 -#define LPX (0xff << 0) -#define HS_PRPR (0xff << 8) -#define HS_ZERO (0xff << 16) -#define HS_TRAIL (0xff << 24) +#define LPX (5 << 0) +#define HS_PRPR (6 << 8) +#define HS_ZERO (10 << 16) +#define HS_TRAIL (8 << 24) #define DSI_PHY_TIMECON1 0x114 -#define TA_GO (0xff << 0) -#define TA_SURE (0xff << 8) -#define TA_GET (0xff << 16) -#define DA_HS_EXIT (0xff << 24) +#define TA_GO (20 << 0) +#define TA_SURE (7 << 8) +#define TA_GET (25 << 16) +#define DA_HS_EXIT (7 << 24) #define DSI_PHY_TIMECON2 0x118 #define CONT_DET (0xff << 0) @@ -161,20 +161,18 @@ static void mtk_dsi_mask(struct mtk_dsi *dsi, u32 offset, u32 mask, u32 data) static void dsi_phy_timconfig(struct mtk_dsi *dsi) { u32 timcon0, timcon1, timcon2, timcon3; - unsigned int ui, cycle_time; - unsigned int lpx; + u32 ui, cycle_time; ui = 1000 / dsi->data_rate + 0x01; cycle_time = 8000 / dsi->data_rate + 0x01; - lpx = 5; - timcon0 = (8 << 24) | (0xa << 16) | (0x6 << 8) | lpx; - timcon1 = (7 << 24) | (5 * lpx << 16) | ((3 * lpx) / 2) << 8 | - (4 * lpx); + timcon0 = LPX | HS_PRPR | HS_ZERO | HS_TRAIL; + timcon1 = 4 * LPX | (3 * LPX / 2) << 8 | 5 * LPX << 16 | DA_HS_EXIT; timcon2 = ((NS_TO_CYCLE(0x64, cycle_time) + 0xa) << 24) | - (NS_TO_CYCLE(0x150, cycle_time) << 16); - timcon3 = (2 * lpx) << 16 | NS_TO_CYCLE(80 + 52 * ui, cycle_time) << 8 | - NS_TO_CYCLE(0x40, cycle_time); + (NS_TO_CYCLE(0x150, cycle_time) << 16); + timcon3 = (2 * LPX) << 16 | + NS_TO_CYCLE(80 + 52 * ui, cycle_time) << 8 | + NS_TO_CYCLE(0x40, cycle_time); writel(timcon0, dsi->regs + DSI_PHY_TIMECON0); writel(timcon1, dsi->regs + DSI_PHY_TIMECON1); @@ -202,19 +200,49 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi) { struct device *dev = dsi->dev; int ret; + u64 bit_clock, total_bits; + u32 htotal, htotal_bits, bit_per_pixel, overhead_cycles, overhead_bits; if (++dsi->refcount != 1) return 0; + switch (dsi->format) { + case MIPI_DSI_FMT_RGB565: + bit_per_pixel = 16; + break; + case MIPI_DSI_FMT_RGB666_PACKED: + bit_per_pixel = 18; + break; + case MIPI_DSI_FMT_RGB666: + case MIPI_DSI_FMT_RGB888: + default: + bit_per_pixel = 24; + break; + } /** - * data_rate = (pixel_clock / 1000) * pixel_dipth * mipi_ratio; - * pixel_clock unit is Khz, data_rata unit is MHz, so need divide 1000. - * mipi_ratio is mipi clk coefficient for balance the pixel clk in mipi. - * we set mipi_ratio is 1.05. + * data_rate = (pixel_clock) * bit_per_pixel * mipi_ratio / lane_num; + * vm.pixelclock is Khz, data_rata unit is Hz, so need to multiply 1000 + * mipi_ratio is (htotal * byte_per_pixel / lane_num + Tlpx + Ths_prep + * + Thstrail + Ths_exit + Ths_zero) / + * (htotal * byte_per_pixel /lane_number) */ - dsi->data_rate = dsi->vm.pixelclock * 3 * 21 / (1 * 1000 * 10); + bit_clock = dsi->vm.pixelclock * 1000 * bit_per_pixel; + htotal = dsi->vm.hactive + dsi->vm.hback_porch + dsi->vm.hfront_porch + + dsi->vm.hsync_len; + htotal_bits = htotal * bit_per_pixel; + + /** + * overhead = lpx + hs_prepare + hs_zero + hs_trail + hs_exit + */ + overhead_cycles = LPX + (HS_PRPR >> 8) + (HS_ZERO >> 16) + + (HS_TRAIL >> 24) + (DA_HS_EXIT >> 24); + overhead_bits = overhead_cycles * dsi->lanes * 8; + total_bits = htotal_bits + overhead_bits; + + dsi->data_rate = DIV_ROUND_UP_ULL(bit_clock * total_bits, + htotal_bits * dsi->lanes); - ret = clk_set_rate(dsi->hs_clk, dsi->data_rate * 1000000); + ret = clk_set_rate(dsi->hs_clk, dsi->data_rate); if (ret < 0) { dev_err(dev, "Failed to set data rate: %d\n", ret); goto err_refcount; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html