Hi Thomas.
Introducing drm_simple_display_pipe to hold some of the data,
and then a later patch to change over would have helped the readability
I think.
Anyway - deleted unused code belongs to another patch.
Other than tthose details I did not spot anything, but then I did not
read this patch as carefully as some of the others.
With the removed code migrated to another aptch, and the missing code
explained the patch is:
Acked-by: Sam Ravnborg <s...@ravnborg.org>
On Wed, Apr 29, 2020 at 04:32:37PM +0200, Thomas Zimmermann wrote:
> The mgag200 supports a single pipeline with only a primary plane. It can
> be converted to simple KMS helpers. This also adds support for atomic
> modesetting. Wayland compositors, which use pageflip ioctls, can now be
> used with mgag200.
>
> Signed-off-by: Thomas Zimmermann <tzimmerm...@suse.de>
> ---
> drivers/gpu/drm/mgag200/mgag200_drv.c | 2 +-
> drivers/gpu/drm/mgag200/mgag200_drv.h | 4 +-
> drivers/gpu/drm/mgag200/mgag200_mode.c | 396 +++++++++++--------------
> 3 files changed, 171 insertions(+), 231 deletions(-)
>
> diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.c
> b/drivers/gpu/drm/mgag200/mgag200_drv.c
> index 3298b7ef18b03..b1272165621ed 100644
> --- a/drivers/gpu/drm/mgag200/mgag200_drv.c
> +++ b/drivers/gpu/drm/mgag200/mgag200_drv.c
> @@ -140,7 +140,7 @@ int mgag200_driver_dumb_create(struct drm_file *file,
> }
>
> static struct drm_driver driver = {
> - .driver_features = DRIVER_GEM | DRIVER_MODESET,
> + .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
> .fops = &mgag200_driver_fops,
> .name = DRIVER_NAME,
> .desc = DRIVER_DESC,
> diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.h
> b/drivers/gpu/drm/mgag200/mgag200_drv.h
> index b10da90e0f35a..2e407508714c8 100644
> --- a/drivers/gpu/drm/mgag200/mgag200_drv.h
> +++ b/drivers/gpu/drm/mgag200/mgag200_drv.h
> @@ -19,6 +19,7 @@
> #include <drm/drm_fb_helper.h>
> #include <drm/drm_gem.h>
> #include <drm/drm_gem_vram_helper.h>
> +#include <drm/drm_simple_kms_helper.h>
>
> #include "mgag200_reg.h"
>
> @@ -107,6 +108,7 @@
>
> #define to_mga_crtc(x) container_of(x, struct mga_crtc, base)
> #define to_mga_connector(x) container_of(x, struct mga_connector, base)
> +#define to_mga_device(x) (dev->dev_private)
Upclassing please.
>
> struct mga_crtc {
> struct drm_crtc base;
> @@ -176,7 +178,7 @@ struct mga_device {
> u32 unique_rev_id;
>
> struct mga_connector connector;
> - struct drm_encoder encoder;
> + struct drm_simple_display_pipe display_pipe;
> };
>
> static inline enum mga_type
> diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c
> b/drivers/gpu/drm/mgag200/mgag200_mode.c
> index 884fc668a6dae..d9b4055e38982 100644
> --- a/drivers/gpu/drm/mgag200/mgag200_mode.c
> +++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
> @@ -11,10 +11,13 @@
> #include <linux/delay.h>
> #include <linux/pci.h>
>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_atomic_state_helper.h>
> #include <drm/drm_crtc_helper.h>
> #include <drm/drm_fourcc.h>
> #include <drm/drm_gem_framebuffer_helper.h>
> #include <drm/drm_plane_helper.h>
> +#include <drm/drm_print.h>
> #include <drm/drm_probe_helper.h>
> #include <drm/drm_simple_kms_helper.h>
>
> @@ -30,13 +33,18 @@ static void mga_crtc_load_lut(struct drm_crtc *crtc)
> {
> struct drm_device *dev = crtc->dev;
> struct mga_device *mdev = dev->dev_private;
> - struct drm_framebuffer *fb = crtc->primary->fb;
> + struct drm_framebuffer *fb;
> u16 *r_ptr, *g_ptr, *b_ptr;
> int i;
>
> if (!crtc->enabled)
> return;
>
> + if (!mdev->display_pipe.plane.state)
> + return;
> +
> + fb = mdev->display_pipe.plane.state->fb;
> +
> r_ptr = crtc->gamma_store;
> g_ptr = r_ptr + crtc->gamma_size;
> b_ptr = g_ptr + crtc->gamma_size;
> @@ -845,56 +853,6 @@ static void mgag200_set_startadd(struct mga_device *mdev,
> WREG_ECRT(0x00, crtcext0);
> }
>
> -static int mga_crtc_do_set_base(struct mga_device *mdev,
> - const struct drm_framebuffer *fb,
> - const struct drm_framebuffer *old_fb)
> -{
> - struct drm_gem_vram_object *gbo;
> - int ret;
> - s64 gpu_addr;
> -
> - if (old_fb) {
> - gbo = drm_gem_vram_of_gem(old_fb->obj[0]);
> - drm_gem_vram_unpin(gbo);
> - }
> -
> - gbo = drm_gem_vram_of_gem(fb->obj[0]);
> -
> - ret = drm_gem_vram_pin(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM);
> - if (ret)
> - return ret;
> - gpu_addr = drm_gem_vram_offset(gbo);
> - if (gpu_addr < 0) {
> - ret = (int)gpu_addr;
> - goto err_drm_gem_vram_unpin;
> - }
> -
> - mgag200_set_startadd(mdev, (unsigned long)gpu_addr);
> -
> - return 0;
> -
> -err_drm_gem_vram_unpin:
> - drm_gem_vram_unpin(gbo);
> - return ret;
> -}
> -
> -static int mga_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
> - struct drm_framebuffer *old_fb)
> -{
> - struct drm_device *dev = crtc->dev;
> - struct mga_device *mdev = dev->dev_private;
> - struct drm_framebuffer *fb = crtc->primary->fb;
> - unsigned int count;
> -
> - while (RREG8(0x1fda) & 0x08) { }
> - while (!(RREG8(0x1fda) & 0x08)) { }
> -
> - count = RREG8(MGAREG_VCOUNT) + 2;
> - while (RREG8(MGAREG_VCOUNT) < count) { }
I think we discussed the above lines before. I cannot find then in the
converted code.
> -
> - return mga_crtc_do_set_base(mdev, fb, old_fb);
> -}
> -
> static void mgag200_set_pci_regs(struct mga_device *mdev)
> {
> uint32_t option = 0, option2 = 0;
> @@ -1291,93 +1249,6 @@ static void mgag200_g200ev_set_hiprilvl(struct
> mga_device *mdev)
> WREG_ECRT(0x06, 0x00);
> }
>
> -static int mga_crtc_mode_set(struct drm_crtc *crtc,
> - struct drm_display_mode *mode,
> - struct drm_display_mode *adjusted_mode,
> - int x, int y, struct drm_framebuffer *old_fb)
> -{
> - struct drm_device *dev = crtc->dev;
> - struct mga_device *mdev = dev->dev_private;
> - const struct drm_framebuffer *fb = crtc->primary->fb;
> -
> - mgag200_init_regs(mdev);
> -
> - mgag200_set_format_regs(mdev, fb);
> - mga_crtc_do_set_base(mdev, fb, old_fb);
> - mgag200_set_offset(mdev, fb);
> -
> - mgag200_set_mode_regs(mdev, mode);
> -
> - if (mdev->type == G200_ER)
> - mgag200_g200er_reset_tagfifo(mdev);
> -
> - if (IS_G200_SE(mdev))
> - mgag200_g200se_set_hiprilvl(mdev, mode, fb);
> - else if (mdev->type == G200_EV)
> - mgag200_g200ev_set_hiprilvl(mdev);
> -
> - return 0;
> -}
> -
This part
> -#if 0 /* code from mjg to attempt D3 on crtc dpms off - revisit later */
> -static int mga_suspend(struct drm_crtc *crtc)
> -{
> - struct mga_crtc *mga_crtc = to_mga_crtc(crtc);
> - struct drm_device *dev = crtc->dev;
> - struct mga_device *mdev = dev->dev_private;
> - struct pci_dev *pdev = dev->pdev;
> - int option;
> -
> - if (mdev->suspended)
> - return 0;
> -
> - WREG_SEQ(1, 0x20);
> - WREG_ECRT(1, 0x30);
> - /* Disable the pixel clock */
> - WREG_DAC(0x1a, 0x05);
> - /* Power down the DAC */
> - WREG_DAC(0x1e, 0x18);
> - /* Power down the pixel PLL */
> - WREG_DAC(0x1a, 0x0d);
> -
> - /* Disable PLLs and clocks */
> - pci_read_config_dword(pdev, PCI_MGA_OPTION, &option);
> - option &= ~(0x1F8024);
> - pci_write_config_dword(pdev, PCI_MGA_OPTION, option);
> - pci_set_power_state(pdev, PCI_D3hot);
> - pci_disable_device(pdev);
> -
> - mdev->suspended = true;
> -
> - return 0;
> -}
> -
> -static int mga_resume(struct drm_crtc *crtc)
> -{
> - struct mga_crtc *mga_crtc = to_mga_crtc(crtc);
> - struct drm_device *dev = crtc->dev;
> - struct mga_device *mdev = dev->dev_private;
> - struct pci_dev *pdev = dev->pdev;
> - int option;
> -
> - if (!mdev->suspended)
> - return 0;
> -
> - pci_set_power_state(pdev, PCI_D0);
> - pci_enable_device(pdev);
> -
> - /* Disable sysclk */
> - pci_read_config_dword(pdev, PCI_MGA_OPTION, &option);
> - option &= ~(0x4);
> - pci_write_config_dword(pdev, PCI_MGA_OPTION, option);
> -
> - mdev->suspended = false;
> -
> - return 0;
> -}
> -
> -#endif
ending here - does not belong in this patch.
> -
> static void mga_crtc_dpms(struct drm_crtc *crtc, int mode)
> {
> struct drm_device *dev = crtc->dev;
> @@ -1470,7 +1341,6 @@ static void mga_crtc_commit(struct drm_crtc *crtc)
> {
> struct drm_device *dev = crtc->dev;
> struct mga_device *mdev = dev->dev_private;
> - const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
> u8 tmp;
>
> if (mdev->type == G200_WB || mdev->type == G200_EW3)
> @@ -1489,78 +1359,7 @@ static void mga_crtc_commit(struct drm_crtc *crtc)
> WREG_SEQ(0x1, tmp);
> WREG_SEQ(0, 3);
> }
> - crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
> -}
> -
> -/*
> - * The core can pass us a set of gamma values to program. We actually only
> - * use this for 8-bit mode so can't perform smooth fades on deeper modes,
> - * but it's a requirement that we provide the function
> - */
> -static int mga_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
> - u16 *blue, uint32_t size,
> - struct drm_modeset_acquire_ctx *ctx)
> -{
> - mga_crtc_load_lut(crtc);
> -
> - return 0;
> -}
> -
> -/* Simple cleanup function */
> -static void mga_crtc_destroy(struct drm_crtc *crtc)
> -{
> - struct mga_crtc *mga_crtc = to_mga_crtc(crtc);
> -
> - drm_crtc_cleanup(crtc);
> - kfree(mga_crtc);
> -}
> -
> -static void mga_crtc_disable(struct drm_crtc *crtc)
> -{
> - DRM_DEBUG_KMS("\n");
> - mga_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
> - if (crtc->primary->fb) {
> - struct drm_framebuffer *fb = crtc->primary->fb;
> - struct drm_gem_vram_object *gbo =
> - drm_gem_vram_of_gem(fb->obj[0]);
> - drm_gem_vram_unpin(gbo);
> - }
> - crtc->primary->fb = NULL;
> -}
> -
> -/* These provide the minimum set of functions required to handle a CRTC */
> -static const struct drm_crtc_funcs mga_crtc_funcs = {
> - .gamma_set = mga_crtc_gamma_set,
> - .set_config = drm_crtc_helper_set_config,
> - .destroy = mga_crtc_destroy,
> -};
> -
> -static const struct drm_crtc_helper_funcs mga_helper_funcs = {
> - .disable = mga_crtc_disable,
> - .dpms = mga_crtc_dpms,
> - .mode_set = mga_crtc_mode_set,
> - .mode_set_base = mga_crtc_mode_set_base,
> - .prepare = mga_crtc_prepare,
> - .commit = mga_crtc_commit,
> -};
> -
> -/* CRTC setup */
> -static void mga_crtc_init(struct mga_device *mdev)
> -{
> - struct mga_crtc *mga_crtc;
> -
> - mga_crtc = kzalloc(sizeof(struct mga_crtc) +
> - (MGAG200FB_CONN_LIMIT * sizeof(struct
> drm_connector *)),
> - GFP_KERNEL);
> -
> - if (mga_crtc == NULL)
> - return;
> -
> - drm_crtc_init(mdev->dev, &mga_crtc->base, &mga_crtc_funcs);
> -
> - drm_mode_crtc_set_gamma_size(&mga_crtc->base, MGAG200_LUT_SIZE);
> -
> - drm_crtc_helper_add(&mga_crtc->base, &mga_helper_funcs);
> + mga_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
> }
>
> /*
> @@ -1694,14 +1493,16 @@ static void mga_connector_destroy(struct
> drm_connector *connector)
> }
>
> static const struct drm_connector_helper_funcs
> mga_vga_connector_helper_funcs = {
> - .get_modes = mga_vga_get_modes,
> + .get_modes = mga_vga_get_modes,
> .mode_valid = mga_vga_mode_valid,
> };
>
> static const struct drm_connector_funcs mga_vga_connector_funcs = {
> - .dpms = drm_helper_connector_dpms,
> - .fill_modes = drm_helper_probe_single_connector_modes,
> - .destroy = mga_connector_destroy,
> + .reset = drm_atomic_helper_connector_reset,
> + .fill_modes = drm_helper_probe_single_connector_modes,
> + .destroy = mga_connector_destroy,
> + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> };
>
> static int mgag200_vga_connector_init(struct mga_device *mdev)
> @@ -1733,8 +1534,138 @@ static int mgag200_vga_connector_init(struct
> mga_device *mdev)
> return ret;
> }
>
> +/*
> + * Simple Display Pipe
> + */
> +
> +static enum drm_mode_status
> +mgag200_simple_display_pipe_mode_valid(struct drm_simple_display_pipe *pipe,
> + const struct drm_display_mode *mode)
> +{
> + return MODE_OK;
> +}
> +
> +static void
> +mgag200_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
> + struct drm_crtc_state *crtc_state,
> + struct drm_plane_state *plane_state)
> +{
> + struct drm_crtc *crtc = &pipe->crtc;
> + struct drm_device *dev = crtc->dev;
> + struct mga_device *mdev = to_mga_device(dev);
> + struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
> + struct drm_framebuffer *fb = plane_state->fb;
> + struct drm_gem_vram_object *gbo;
> + s64 gpu_addr;
> +
> + gbo = drm_gem_vram_of_gem(fb->obj[0]);
> +
> + gpu_addr = drm_gem_vram_offset(gbo);
> + if (drm_WARN_ON_ONCE(dev, gpu_addr < 0))
> + return; /* BUG: BO should have been pinned to VRAM. */
> +
> + mga_crtc_prepare(crtc);
> +
> + mgag200_set_format_regs(mdev, fb);
> + mgag200_set_mode_regs(mdev, adjusted_mode);
> +
> + if (mdev->type == G200_ER)
> + mgag200_g200er_reset_tagfifo(mdev);
> +
> + if (IS_G200_SE(mdev))
> + mgag200_g200se_set_hiprilvl(mdev, adjusted_mode, fb);
> + else if (mdev->type == G200_EV)
> + mgag200_g200ev_set_hiprilvl(mdev);
> +
> + mga_crtc_commit(crtc);
> +}
> +
> +static void
> +mgag200_simple_display_pipe_disable(struct drm_simple_display_pipe *pipe)
> +{
> + struct drm_crtc *crtc = &pipe->crtc;
> +
> + mga_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
> +}
> +
> +static int
> +mgag200_simple_display_pipe_check(struct drm_simple_display_pipe *pipe,
> + struct drm_plane_state *plane_state,
> + struct drm_crtc_state *crtc_state)
> +{
> + struct drm_plane *plane = plane_state->plane;
> + struct drm_framebuffer *new_fb = plane_state->fb;
> + struct drm_framebuffer *fb = NULL;
> +
> + if (!new_fb)
> + return 0;
> +
> + if (plane->state)
> + fb = plane->state->fb;
> +
> + if (!fb || (fb->format != new_fb->format))
> + crtc_state->mode_changed = true; /* update PLL settings */
> +
> + return 0;
> +}
> +
> +static void
> +mgag200_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
> + struct drm_plane_state *old_state)
> +{
> + struct drm_plane *plane = &pipe->plane;
> + struct drm_device *dev = plane->dev;
> + struct mga_device *mdev = to_mga_device(dev);
> + struct drm_plane_state *state = plane->state;
> + struct drm_framebuffer *fb = state->fb;
> + struct drm_gem_vram_object *gbo;
> + s64 gpu_addr;
> +
> + if (!fb)
> + return;
> +
> + gbo = drm_gem_vram_of_gem(fb->obj[0]);
> +
> + gpu_addr = drm_gem_vram_offset(gbo);
> + if (drm_WARN_ON_ONCE(dev, gpu_addr < 0))
> + return; /* BUG: BO should have been pinned to VRAM. */
> +
> + mgag200_set_format_regs(mdev, fb);
> + mgag200_set_startadd(mdev, (unsigned long)gpu_addr);
> + mgag200_set_offset(mdev, fb);
> +}
> +
> +static const struct drm_simple_display_pipe_funcs
> +mgag200_simple_display_pipe_funcs = {
> + .mode_valid = mgag200_simple_display_pipe_mode_valid,
> + .enable = mgag200_simple_display_pipe_enable,
> + .disable = mgag200_simple_display_pipe_disable,
> + .check = mgag200_simple_display_pipe_check,
> + .update = mgag200_simple_display_pipe_update,
> + .prepare_fb = drm_gem_vram_simple_display_pipe_prepare_fb,
> + .cleanup_fb = drm_gem_vram_simple_display_pipe_cleanup_fb,
> +};
> +
> +static const uint32_t mgag200_simple_display_pipe_formats[] = {
> + DRM_FORMAT_XRGB8888,
> + DRM_FORMAT_RGB565,
> + DRM_FORMAT_RGB888,
> +};
> +
> +static const uint64_t mgag200_simple_display_pipe_modifiers[] = {
> + DRM_FORMAT_MOD_LINEAR,
> + DRM_FORMAT_MOD_INVALID
> +};
> +
> +/*
> + * Mode config
> + */
> +
> static const struct drm_mode_config_funcs mgag200_mode_config_funcs = {
> - .fb_create = drm_gem_fb_create
> + .fb_create = drm_gem_fb_create,
> + .mode_valid = drm_vram_helper_mode_valid,
> + .atomic_check = drm_atomic_helper_check,
> + .atomic_commit = drm_atomic_helper_commit,
> };
>
> static unsigned int mgag200_preferred_depth(struct mga_device *mdev)
> @@ -1748,10 +1679,13 @@ static unsigned int mgag200_preferred_depth(struct
> mga_device *mdev)
> int mgag200_modeset_init(struct mga_device *mdev)
> {
> struct drm_device *dev = mdev->dev;
> - struct drm_encoder *encoder = &mdev->encoder;
> struct drm_connector *connector = &mdev->connector.base;
> + struct drm_simple_display_pipe *pipe = &mdev->display_pipe;
> + size_t format_count = ARRAY_SIZE(mgag200_simple_display_pipe_formats);
> int ret;
>
> + mgag200_init_regs(mdev);
> +
> ret = drmm_mode_config_init(dev);
> if (ret) {
> drm_err(dev, "drmm_mode_config_init() failed, error %d\n",
> @@ -1769,26 +1703,30 @@ int mgag200_modeset_init(struct mga_device *mdev)
>
> dev->mode_config.funcs = &mgag200_mode_config_funcs;
>
> - mga_crtc_init(mdev);
> -
> - ret = drm_simple_encoder_init(mdev->dev, encoder,
> - DRM_MODE_ENCODER_DAC);
> + ret = mgag200_vga_connector_init(mdev);
> if (ret) {
> - drm_err(mdev->dev,
> - "drm_simple_encoder_init() failed, error %d\n",
> + drm_err(dev, "mga_vga_connector_init() failed, error %d\n",
> ret);
> return ret;
> }
> - encoder->possible_crtcs = 0x1;
>
> - ret = mgag200_vga_connector_init(mdev);
> + ret = drm_simple_display_pipe_init(dev, pipe,
> + &mgag200_simple_display_pipe_funcs,
> + mgag200_simple_display_pipe_formats,
> + format_count,
> +
> mgag200_simple_display_pipe_modifiers,
> + connector);
> if (ret) {
> - drm_err(mdev->dev,
> - "mga_vga_connector_init() failed, error %d\n", ret);
> - return -1;
> + drm_err(dev,
> + "drm_simple_display_pipe_init() failed, error %d\n",
> + ret);
> + return ret;
> }
>
> - drm_connector_attach_encoder(connector, encoder);
> + /* FIXME: legacy gamma tables; convert to CRTC state */
> + drm_mode_crtc_set_gamma_size(&pipe->crtc, MGAG200_LUT_SIZE);
> +
> + drm_mode_config_reset(dev);
>
> return 0;
> }
> --
> 2.26.0
>
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