From 5d30c876d0cefec6af312b6c5b036ae679905e6d Mon Sep 17 00:00:00 2001 From: Tomi Valkeinen Date: Thu, 2 Apr 2009 16:49:27 +0300 Subject: [PATCH] DSS2: DSI: calculate VP_CLK_RATIO properly --- drivers/video/omap2/dss/dsi.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c index 444293136ac5..aecb89dacdb3 100644 --- a/drivers/video/omap2/dss/dsi.c +++ b/drivers/video/omap2/dss/dsi.c @@ -1104,7 +1104,10 @@ int dsi_pll_init(bool enable_hsclk, bool enable_hsdiv) enable_clocks(1); dsi_enable_pll_clock(1); - /* configure dispc fck and pixel clock to something sane */ + /* XXX this should be calculated depending on the screen size, + * required framerate and DSI speed. + * For now 48MHz is enough for 864x480@60 with 360Mbps/lane + * with two lanes */ r = dispc_calc_clock_div(1, 48 * 1000 * 1000, &cinfo); if (r) goto err0; @@ -1119,7 +1122,7 @@ int dsi_pll_init(bool enable_hsclk, bool enable_hsdiv) if (r) goto err0; - /* PLL does not come out of reset without this... */ + /* XXX PLL does not come out of reset without this... */ dispc_pck_free_enable(1); if (wait_for_bit_change(DSI_PLL_STATUS, 0, 1) != 1) { @@ -1128,8 +1131,8 @@ int dsi_pll_init(bool enable_hsclk, bool enable_hsdiv) goto err1; } - /* ... but if left on, we get problems when planes do not - * fill the whole display. No idea about this XXX */ + /* XXX ... but if left on, we get problems when planes do not + * fill the whole display. No idea about this */ dispc_pck_free_enable(0); if (enable_hsclk && enable_hsdiv) @@ -2214,6 +2217,7 @@ static int dsi_proto_config(struct omap_display *display) { u32 r; int buswidth = 0; + int div; dsi_config_tx_fifo(DSI_FIFO_SIZE_128, DSI_FIFO_SIZE_0, @@ -2254,8 +2258,9 @@ static int dsi_proto_config(struct omap_display *display) r = FLD_MOD(r, 1, 1, 1); /* CS_RX_EN */ r = FLD_MOD(r, 1, 2, 2); /* ECC_RX_EN */ r = FLD_MOD(r, 1, 3, 3); /* TX_FIFO_ARBITRATION */ - /* XXX what should the ratio be */ - r = FLD_MOD(r, 0, 4, 4); /* VP_CLK_RATIO, VP_PCLK = VP_CLK/2 */ + + div = dispc_lclk_rate() / dispc_pclk_rate(); + r = FLD_MOD(r, div == 2 ? 0 : 1, 4, 4); /* VP_CLK_RATIO */ r = FLD_MOD(r, buswidth, 7, 6); /* VP_DATA_BUS_WIDTH */ r = FLD_MOD(r, 0, 8, 8); /* VP_CLK_POL */ r = FLD_MOD(r, 2, 13, 12); /* LINE_BUFFER, 2 lines */ -- 2.39.2