The video DSI mode had not really been tested. These fixes makes it more likely to work on real hardware: - Set the HS clock to something the video mode reported by the panel can handle rather than the max HS rate. - Put the active width (x width) in the right bits and the VSA (vertical sync active) in the right bits (those were swapped). - Calculate the packet sizes in bytes as in the vendor driver, rather than in bits. - Handle negative result in front/back/sync packages and fall back to zero like in the vendor driver.

Cc: Stephan Gerhold stephan@gerhold.net Fixes: 5fc537bfd000 ("drm/mcde: Add new driver for ST-Ericsson MCDE") Signed-off-by: Linus Walleij linus.walleij@linaro.org --- ChangeLog v1->v2: - Fix some more comments so we understand what is going on. - Set up the maximum line limit size in the right register instead of setting it in the burst size register portion. - Set some default wakeup time other than zero (still need fixing more). --- drivers/gpu/drm/mcde/mcde_dsi.c | 75 ++++++++++++++++++++++----------- 1 file changed, 50 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/mcde/mcde_dsi.c b/drivers/gpu/drm/mcde/mcde_dsi.c index cd261c266f35..5c65cd70fcd3 100644 --- a/drivers/gpu/drm/mcde/mcde_dsi.c +++ b/drivers/gpu/drm/mcde/mcde_dsi.c @@ -365,11 +365,12 @@ void mcde_dsi_te_request(struct mipi_dsi_device *mdsi) static void mcde_dsi_setup_video_mode(struct mcde_dsi *d, const struct drm_display_mode *mode) { - u8 bpp = mipi_dsi_pixel_format_to_bpp(d->mdsi->format); + /* cpp, characters per pixel, number of bytes per pixel */ + u8 cpp = mipi_dsi_pixel_format_to_bpp(d->mdsi->format) / 8; u64 bpl; - u32 hfp; - u32 hbp; - u32 hsa; + int hfp; + int hbp; + int hsa; u32 blkline_pck, line_duration; u32 blkeol_pck, blkeol_duration; u32 val; @@ -408,11 +409,11 @@ static void mcde_dsi_setup_video_mode(struct mcde_dsi *d, return; }

- /* TODO: TVG could be enabled here */ + /* TODO: TVG (test video generator) could be enabled here */

- /* Send blanking packet */ + /* During blanking: go to LP mode */ val |= DSI_VID_MAIN_CTL_REG_BLKLINE_MODE_LP_0; - /* Send EOL packet */ + /* During EOL: go to LP mode */ val |= DSI_VID_MAIN_CTL_REG_BLKEOL_MODE_LP_0; /* Recovery mode 1 */ val |= 1 << DSI_VID_MAIN_CTL_RECOVERY_MODE_SHIFT; @@ -420,13 +421,13 @@ static void mcde_dsi_setup_video_mode(struct mcde_dsi *d, writel(val, d->regs + DSI_VID_MAIN_CTL);

/* Vertical frame parameters are pretty straight-forward */ - val = mode->vdisplay << DSI_VID_VSIZE_VSA_LENGTH_SHIFT; + val = mode->vdisplay << DSI_VID_VSIZE_VACT_LENGTH_SHIFT; /* vertical front porch */ val |= (mode->vsync_start - mode->vdisplay) << DSI_VID_VSIZE_VFP_LENGTH_SHIFT; /* vertical sync active */ val |= (mode->vsync_end - mode->vsync_start) - << DSI_VID_VSIZE_VACT_LENGTH_SHIFT; + << DSI_VID_VSIZE_VSA_LENGTH_SHIFT; /* vertical back porch */ val |= (mode->vtotal - mode->vsync_end) << DSI_VID_VSIZE_VBP_LENGTH_SHIFT; @@ -437,21 +438,25 @@ static void mcde_dsi_setup_video_mode(struct mcde_dsi *d, * horizontal resolution is given in pixels and must be re-calculated * into bytes since this is what the hardware expects. * + * hfp = horizontal front porch in bytes + * hbp = horizontal back porch in bytes + * hsa = horizontal sync active in bytes + * * 6 + 2 is HFP header + checksum */ - hfp = (mode->hsync_start - mode->hdisplay) * bpp - 6 - 2; + hfp = (mode->hsync_start - mode->hdisplay) * cpp - 6 - 2; if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) { /* * 6 is HBP header + checksum * 4 is RGB header + checksum */ - hbp = (mode->htotal - mode->hsync_end) * bpp - 4 - 6; + hbp = (mode->htotal - mode->hsync_end) * cpp - 4 - 6; /* * 6 is HBP header + checksum * 4 is HSW packet bytes * 4 is RGB header + checksum */ - hsa = (mode->hsync_end - mode->hsync_start) * bpp - 4 - 4 - 6; + hsa = (mode->hsync_end - mode->hsync_start) * cpp - 4 - 4 - 6; } else { /* * HBP includes both back porch and sync @@ -459,11 +464,23 @@ static void mcde_dsi_setup_video_mode(struct mcde_dsi *d, * 4 is HSW packet bytes * 4 is RGB header + checksum */ - hbp = (mode->htotal - mode->hsync_start) * bpp - 4 - 4 - 6; - /* HSA is not considered in this mode and set to 0 */ + hbp = (mode->htotal - mode->hsync_start) * cpp - 4 - 4 - 6; + /* HSA is not present in this mode and set to 0 */ + hsa = 0; + } + if (hfp < 0) { + dev_info(d->dev, "hfp negative, set to 0\n"); + hfp = 0; + } + if (hbp < 0) { + dev_info(d->dev, "hbp negative, set to 0\n"); + hbp = 0; + } + if (hsa < 0) { + dev_info(d->dev, "hsa negative, set to 0\n"); hsa = 0; } - dev_dbg(d->dev, "hfp: %u, hbp: %u, hsa: %u\n", + dev_dbg(d->dev, "hfp: %u, hbp: %u, hsa: %u bytes\n", hfp, hbp, hsa);

/* Frame parameters: horizontal sync active */ @@ -474,8 +491,8 @@ static void mcde_dsi_setup_video_mode(struct mcde_dsi *d, val |= hfp << DSI_VID_HSIZE1_HFP_LENGTH_SHIFT; writel(val, d->regs + DSI_VID_HSIZE1);

- /* RGB data length (bytes on one scanline) */ - val = mode->hdisplay * (bpp / 8); + /* RGB data length (visible bytes on one scanline) */ + val = mode->hdisplay * cpp; writel(val, d->regs + DSI_VID_HSIZE2);

/* TODO: further adjustments for TVG mode here */ @@ -507,37 +524,43 @@ static void mcde_dsi_setup_video_mode(struct mcde_dsi *d, }

line_duration = (blkline_pck + 6) / d->mdsi->lanes; - dev_dbg(d->dev, "line duration %u\n", line_duration); + dev_dbg(d->dev, "line duration %u bytes\n", line_duration); val = line_duration << DSI_VID_DPHY_TIME_REG_LINE_DURATION_SHIFT; /* * This is the time to perform LP->HS on D-PHY * FIXME: nowhere to get this from: DT property on the DSI? + * values like 48 and 72 seen in the vendor code. */ - val |= 0 << DSI_VID_DPHY_TIME_REG_WAKEUP_TIME_SHIFT; + val |= 48 << DSI_VID_DPHY_TIME_REG_WAKEUP_TIME_SHIFT; writel(val, d->regs + DSI_VID_DPHY_TIME);

/* Calculate block end of line */ - blkeol_pck = bpl - mode->hdisplay * bpp - 6; + blkeol_pck = bpl - mode->hdisplay * cpp - 6; blkeol_duration = (blkeol_pck + 6) / d->mdsi->lanes; - dev_dbg(d->dev, "blkeol pck: %u, duration: %u\n", - blkeol_pck, blkeol_duration); + dev_dbg(d->dev, "blkeol pck: %u bytes, duration: %u bytes\n", + blkeol_pck, blkeol_duration);

if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) { /* Set up EOL clock for burst mode */ val = readl(d->regs + DSI_VID_BLKSIZE1); val |= blkeol_pck << DSI_VID_BLKSIZE1_BLKEOL_PCK_SHIFT; writel(val, d->regs + DSI_VID_BLKSIZE1); - writel(blkeol_pck, d->regs + DSI_VID_VCA_SETTING2); + writel((blkeol_pck & DSI_VID_VCA_SETTING2_EXACT_BURST_LIMIT_MASK) + << DSI_VID_VCA_SETTING2_EXACT_BURST_LIMIT_SHIFT, + d->regs + DSI_VID_VCA_SETTING2);

writel(blkeol_duration, d->regs + DSI_VID_PCK_TIME); + /* Max burst limit */ writel(blkeol_duration - 6, d->regs + DSI_VID_VCA_SETTING1); }

/* Maximum line limit */ val = readl(d->regs + DSI_VID_VCA_SETTING2); + val &= ~DSI_VID_VCA_SETTING2_MAX_LINE_LIMIT_MASK; val |= blkline_pck << - DSI_VID_VCA_SETTING2_EXACT_BURST_LIMIT_SHIFT; + DSI_VID_VCA_SETTING2_MAX_LINE_LIMIT_SHIFT; writel(val, d->regs + DSI_VID_VCA_SETTING2); + dev_dbg(d->dev, "blkline pck: %u bytes\n", blkline_pck);

/* Put IF1 into video mode */ val = readl(d->regs + DSI_MCTL_MAIN_DATA_CTL); @@ -699,7 +722,9 @@ static void mcde_dsi_bridge_mode_set(struct drm_bridge *bridge, lp_freq = d->mdsi->lp_rate; else lp_freq = DSI_DEFAULT_LP_FREQ_HZ; - if (d->mdsi->hs_rate) + if (pixel_clock_hz) + hs_freq = pixel_clock_hz; + else if (d->mdsi->hs_rate) hs_freq = d->mdsi->hs_rate; else hs_freq = DSI_DEFAULT_HS_FREQ_HZ;