[PATCH 1/2] drm/mcde: Break out DSI set-up routine
Sam Ravnborg
sam at ravnborg.org
Mon Nov 23 17:04:40 EST 2020
Hi Linus
On Thu, Nov 12, 2020 at 03:29:24PM +0100, Linus Walleij wrote:
> To be able to support DPI without messing things up we
> first break out the DSI set-up to a separate function.
>
> Cc: Stephan Gerhold <stephan at gerhold.net>
> Cc: phone-devel at vger.kernel.org
> Cc: upstreaming at lists.sr.ht
> Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
> ---
> drivers/gpu/drm/mcde/mcde_display.c | 135 +++++++++++++++-------------
> 1 file changed, 75 insertions(+), 60 deletions(-)
>
> diff --git a/drivers/gpu/drm/mcde/mcde_display.c b/drivers/gpu/drm/mcde/mcde_display.c
> index c271e5bf042e..66a07e340f8a 100644
> --- a/drivers/gpu/drm/mcde/mcde_display.c
> +++ b/drivers/gpu/drm/mcde/mcde_display.c
> @@ -860,74 +860,44 @@ static int mcde_dsi_get_pkt_div(int ppl, int fifo_size)
> return 1;
> }
>
> -static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
> - struct drm_crtc_state *cstate,
> - struct drm_plane_state *plane_state)
> +static void mcde_setup_dsi(struct mcde *mcde, const struct drm_display_mode *mode,
> + int cpp, int *fifo_wtrmrk_lvl, int *dsi_formatter_frame,
> + int *dsi_pkt_size)
> {
> - struct drm_crtc *crtc = &pipe->crtc;
> - struct drm_plane *plane = &pipe->plane;
> - struct drm_device *drm = crtc->dev;
> - struct mcde *mcde = to_mcde(drm);
> - const struct drm_display_mode *mode = &cstate->mode;
> - struct drm_framebuffer *fb = plane->state->fb;
> - u32 format = fb->format->format;
> u32 formatter_ppl = mode->hdisplay; /* pixels per line */
> u32 formatter_lpf = mode->vdisplay; /* lines per frame */
> - int pkt_size, fifo_wtrmrk;
> - int cpp = fb->format->cpp[0];
> + int formatter_frame;
> int formatter_cpp;
> - struct drm_format_name_buf tmp;
> - u32 formatter_frame;
> + int fifo_wtrmrk;
> u32 pkt_div;
> + int pkt_size;
> u32 val;
> - int ret;
>
> - /* This powers up the entire MCDE block and the DSI hardware */
> - ret = regulator_enable(mcde->epod);
> - if (ret) {
> - dev_err(drm->dev, "can't re-enable EPOD regulator\n");
> - return;
> - }
> -
> - dev_info(drm->dev, "enable MCDE, %d x %d format %s\n",
> - mode->hdisplay, mode->vdisplay,
> - drm_get_format_name(format, &tmp));
> - if (!mcde->mdsi) {
> - /* TODO: deal with this for non-DSI output */
> - dev_err(drm->dev, "no DSI master attached!\n");
> - return;
> - }
> + dev_info(mcde->dev, "output in %s mode, format %dbpp\n",
> + (mcde->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO) ?
> + "VIDEO" : "CMD",
> + mipi_dsi_pixel_format_to_bpp(mcde->mdsi->format));
> + formatter_cpp =
> + mipi_dsi_pixel_format_to_bpp(mcde->mdsi->format) / 8;
> + dev_info(mcde->dev, "Overlay CPP: %d bytes, DSI formatter CPP %d bytes\n",
> + cpp, formatter_cpp);
>
> /* Set up the main control, watermark level at 7 */
> val = 7 << MCDE_CONF0_IFIFOCTRLWTRMRKLVL_SHIFT;
> - /* 24 bits DPI: connect LSB Ch B to D[0:7] */
> +
> + /*
> + * This is the internal silicon muxing of the DPI
> + * (parallell display) lines. Since we are not using
> + * this at all (we are using DSI) these are just
> + * dummy values from the vendor tree.
> + */
> val |= 3 << MCDE_CONF0_OUTMUX0_SHIFT;
> - /* TV out: connect LSB Ch B to D[8:15] */
> val |= 3 << MCDE_CONF0_OUTMUX1_SHIFT;
> - /* Don't care about this muxing */
> val |= 0 << MCDE_CONF0_OUTMUX2_SHIFT;
> - /* 24 bits DPI: connect MID Ch B to D[24:31] */
> val |= 4 << MCDE_CONF0_OUTMUX3_SHIFT;
> - /* 5: 24 bits DPI: connect MSB Ch B to D[32:39] */
> val |= 5 << MCDE_CONF0_OUTMUX4_SHIFT;
> - /* Syncmux bits zero: DPI channel A and B on output pins A and B resp */
> writel(val, mcde->regs + MCDE_CONF0);
They are dummy values, but is still seems a shame to write the comments
about the bit interpretation in the registers. Sigh.
>
> - /* Clear any pending interrupts */
> - mcde_display_disable_irqs(mcde);
> - writel(0, mcde->regs + MCDE_IMSCERR);
> - writel(0xFFFFFFFF, mcde->regs + MCDE_RISERR);
> -
> - dev_info(drm->dev, "output in %s mode, format %dbpp\n",
> - (mcde->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO) ?
> - "VIDEO" : "CMD",
> - mipi_dsi_pixel_format_to_bpp(mcde->mdsi->format));
> - formatter_cpp =
> - mipi_dsi_pixel_format_to_bpp(mcde->mdsi->format) / 8;
> - dev_info(drm->dev, "overlay CPP %d bytes, DSI CPP %d bytes\n",
> - cpp,
> - formatter_cpp);
> -
> /* Calculations from mcde_fmtr_dsi.c, fmtr_dsi_enable_video() */
>
> /*
> @@ -948,9 +918,9 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
> /* The FIFO is 640 entries deep on this v3 hardware */
> pkt_div = mcde_dsi_get_pkt_div(mode->hdisplay, 640);
> }
> - dev_dbg(drm->dev, "FIFO watermark after flooring: %d bytes\n",
> + dev_dbg(mcde->dev, "FIFO watermark after flooring: %d bytes\n",
> fifo_wtrmrk);
> - dev_dbg(drm->dev, "Packet divisor: %d bytes\n", pkt_div);
> + dev_dbg(mcde->dev, "Packet divisor: %d bytes\n", pkt_div);
>
> /* NOTE: pkt_div is 1 for video mode */
> pkt_size = (formatter_ppl * formatter_cpp) / pkt_div;
> @@ -958,16 +928,61 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
> if (!(mcde->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO))
> pkt_size++;
>
> - dev_dbg(drm->dev, "DSI packet size: %d * %d bytes per line\n",
> + dev_dbg(mcde->dev, "DSI packet size: %d * %d bytes per line\n",
> pkt_size, pkt_div);
> - dev_dbg(drm->dev, "Overlay frame size: %u bytes\n",
> + dev_dbg(mcde->dev, "Overlay frame size: %u bytes\n",
> mode->hdisplay * mode->vdisplay * cpp);
> - mcde->stride = mode->hdisplay * cpp;
> - dev_dbg(drm->dev, "Overlay line stride: %u bytes\n",
> - mcde->stride);
> /* NOTE: pkt_div is 1 for video mode */
> formatter_frame = pkt_size * pkt_div * formatter_lpf;
> - dev_dbg(drm->dev, "Formatter frame size: %u bytes\n", formatter_frame);
> + dev_dbg(mcde->dev, "Formatter frame size: %u bytes\n", formatter_frame);
> +
> + *fifo_wtrmrk_lvl = fifo_wtrmrk;
> + *dsi_pkt_size = pkt_size;
> + *dsi_formatter_frame = formatter_frame;
> +}
> +
> +static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
> + struct drm_crtc_state *cstate,
> + struct drm_plane_state *plane_state)
> +{
> + struct drm_crtc *crtc = &pipe->crtc;
> + struct drm_plane *plane = &pipe->plane;
> + struct drm_device *drm = crtc->dev;
> + struct mcde *mcde = to_mcde(drm);
> + const struct drm_display_mode *mode = &cstate->mode;
> + struct drm_framebuffer *fb = plane->state->fb;
> + u32 format = fb->format->format;
> + int dsi_pkt_size;
> + int fifo_wtrmrk;
> + int cpp = fb->format->cpp[0];
> + struct drm_format_name_buf tmp;
> + u32 dsi_formatter_frame;
> + u32 val;
> + int ret;
> +
> + /* This powers up the entire MCDE block and the DSI hardware */
> + ret = regulator_enable(mcde->epod);
> + if (ret) {
> + dev_err(drm->dev, "can't re-enable EPOD regulator\n");
> + return;
> + }
> +
> + dev_info(drm->dev, "enable MCDE, %d x %d format %s\n",
> + mode->hdisplay, mode->vdisplay,
> + drm_get_format_name(format, &tmp));
> +
> +
> + /* Clear any pending interrupts */
> + mcde_display_disable_irqs(mcde);
> + writel(0, mcde->regs + MCDE_IMSCERR);
> + writel(0xFFFFFFFF, mcde->regs + MCDE_RISERR);
> +
> + mcde_setup_dsi(mcde, mode, cpp, &fifo_wtrmrk,
> + &dsi_formatter_frame, &dsi_pkt_size);
> +
> + mcde->stride = mode->hdisplay * cpp;
> + dev_dbg(drm->dev, "Overlay line stride: %u bytes\n",
> + mcde->stride);
>
> /* Drain the FIFO A + channel 0 pipe so we have a clean slate */
> mcde_drain_pipe(mcde, MCDE_FIFO_A, MCDE_CHANNEL_0);
> @@ -1011,7 +1026,7 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
>
> /* Configure the DSI formatter 0 for the DSI panel output */
> mcde_configure_dsi_formatter(mcde, MCDE_DSI_FORMATTER_0,
> - formatter_frame, pkt_size);
> + dsi_formatter_frame, dsi_pkt_size);
>
> switch (mcde->flow_mode) {
> case MCDE_COMMAND_TE_FLOW:
The parts I checked looked good.
Acked-by: Sam Ravnborg <sam at ravnborg.org>
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