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Message-ID: <CAA8EJprB2bu3PoTk2aeiBaxBdXtk0iFNqBvRwNmmu4Ms7O5wAA@mail.gmail.com>
Date:   Mon, 30 Oct 2023 01:17:44 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Sui Jingfeng <suijingfeng@...ngson.cn>
Cc:     Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 6/8] drm/loongson: Clean up the output part of LS7A2000

On Sun, 29 Oct 2023 at 21:46, Sui Jingfeng <suijingfeng@...ngson.cn> wrote:
>
> Since the majority of sharable subroutines have been move to lsdc_output.c,
> and functional changes are done with previous patch. We finally see the
> light to cleanup, no functional change.

Please refactor your patches so that code moves can be reviewed as
code being moved, instead of add + remove patches.

>
> Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
> ---
>  drivers/gpu/drm/loongson/lsdc_output_7a2000.c | 469 ------------------
>  1 file changed, 469 deletions(-)
>
> diff --git a/drivers/gpu/drm/loongson/lsdc_output_7a2000.c b/drivers/gpu/drm/loongson/lsdc_output_7a2000.c
> index bf558b61802b..981ab2045e91 100644
> --- a/drivers/gpu/drm/loongson/lsdc_output_7a2000.c
> +++ b/drivers/gpu/drm/loongson/lsdc_output_7a2000.c
> @@ -42,465 +42,6 @@
>   *      |______________________|
>   */
>
> -static int ls7a2000_connector_get_modes(struct drm_connector *connector)
> -{
> -       unsigned int num = 0;
> -       struct edid *edid;
> -
> -       if (connector->ddc) {
> -               edid = drm_get_edid(connector, connector->ddc);
> -               if (edid) {
> -                       drm_connector_update_edid_property(connector, edid);
> -                       num = drm_add_edid_modes(connector, edid);
> -                       kfree(edid);
> -               }
> -
> -               return num;
> -       }
> -
> -       num = drm_add_modes_noedid(connector, 1920, 1200);
> -
> -       drm_set_preferred_mode(connector, 1024, 768);
> -
> -       return num;
> -}
> -
> -static struct drm_encoder *
> -ls7a2000_connector_get_best_encoder(struct drm_connector *connector,
> -                                   struct drm_atomic_state *state)
> -{
> -       struct lsdc_output *output = connector_to_lsdc_output(connector);
> -
> -       return &output->encoder;
> -}
> -
> -static const struct drm_connector_helper_funcs ls7a2000_connector_helpers = {
> -       .atomic_best_encoder = ls7a2000_connector_get_best_encoder,
> -       .get_modes = ls7a2000_connector_get_modes,
> -};
> -
> -/* debugfs */
> -
> -#define LSDC_HDMI_REG(i, reg) {                               \
> -       .name = __stringify_1(LSDC_HDMI##i##_##reg##_REG),    \
> -       .offset = LSDC_HDMI##i##_##reg##_REG,                 \
> -}
> -
> -static const struct lsdc_reg32 ls7a2000_hdmi0_encoder_regs[] = {
> -       LSDC_HDMI_REG(0, ZONE),
> -       LSDC_HDMI_REG(0, INTF_CTRL),
> -       LSDC_HDMI_REG(0, PHY_CTRL),
> -       LSDC_HDMI_REG(0, PHY_PLL),
> -       LSDC_HDMI_REG(0, AVI_INFO_CRTL),
> -       LSDC_HDMI_REG(0, PHY_CAL),
> -       LSDC_HDMI_REG(0, AUDIO_PLL_LO),
> -       LSDC_HDMI_REG(0, AUDIO_PLL_HI),
> -       {NULL, 0},  /* MUST be {NULL, 0} terminated */
> -};
> -
> -static const struct lsdc_reg32 ls7a2000_hdmi1_encoder_regs[] = {
> -       LSDC_HDMI_REG(1, ZONE),
> -       LSDC_HDMI_REG(1, INTF_CTRL),
> -       LSDC_HDMI_REG(1, PHY_CTRL),
> -       LSDC_HDMI_REG(1, PHY_PLL),
> -       LSDC_HDMI_REG(1, AVI_INFO_CRTL),
> -       LSDC_HDMI_REG(1, PHY_CAL),
> -       LSDC_HDMI_REG(1, AUDIO_PLL_LO),
> -       LSDC_HDMI_REG(1, AUDIO_PLL_HI),
> -       {NULL, 0},  /* MUST be {NULL, 0} terminated */
> -};
> -
> -static int ls7a2000_hdmi_encoder_regs_show(struct seq_file *m, void *data)
> -{
> -       struct drm_info_node *node = (struct drm_info_node *)m->private;
> -       struct drm_device *ddev = node->minor->dev;
> -       struct lsdc_device *ldev = to_lsdc(ddev);
> -       const struct lsdc_reg32 *preg;
> -
> -       preg = (const struct lsdc_reg32 *)node->info_ent->data;
> -
> -       while (preg->name) {
> -               u32 offset = preg->offset;
> -
> -               seq_printf(m, "%s (0x%04x): 0x%08x\n",
> -                          preg->name, offset, lsdc_rreg32(ldev, offset));
> -               ++preg;
> -       }
> -
> -       return 0;
> -}
> -
> -static const struct drm_info_list ls7a2000_hdmi0_debugfs_files[] = {
> -       { "regs", ls7a2000_hdmi_encoder_regs_show, 0, (void *)ls7a2000_hdmi0_encoder_regs },
> -};
> -
> -static const struct drm_info_list ls7a2000_hdmi1_debugfs_files[] = {
> -       { "regs", ls7a2000_hdmi_encoder_regs_show, 0, (void *)ls7a2000_hdmi1_encoder_regs },
> -};
> -
> -static void ls7a2000_hdmi0_late_register(struct drm_connector *connector,
> -                                        struct dentry *root)
> -{
> -       struct drm_device *ddev = connector->dev;
> -       struct drm_minor *minor = ddev->primary;
> -
> -       drm_debugfs_create_files(ls7a2000_hdmi0_debugfs_files,
> -                                ARRAY_SIZE(ls7a2000_hdmi0_debugfs_files),
> -                                root, minor);
> -}
> -
> -static void ls7a2000_hdmi1_late_register(struct drm_connector *connector,
> -                                        struct dentry *root)
> -{
> -       struct drm_device *ddev = connector->dev;
> -       struct drm_minor *minor = ddev->primary;
> -
> -       drm_debugfs_create_files(ls7a2000_hdmi1_debugfs_files,
> -                                ARRAY_SIZE(ls7a2000_hdmi1_debugfs_files),
> -                                root, minor);
> -}
> -
> -/* monitor present detection */
> -
> -static enum drm_connector_status
> -ls7a2000_hdmi0_vga_connector_detect(struct drm_connector *connector, bool force)
> -{
> -       struct drm_device *ddev = connector->dev;
> -       struct lsdc_device *ldev = to_lsdc(ddev);
> -       u32 val;
> -
> -       val = lsdc_rreg32(ldev, LSDC_HDMI_HPD_STATUS_REG);
> -
> -       if (val & HDMI0_HPD_FLAG)
> -               return connector_status_connected;
> -
> -       if (connector->ddc) {
> -               if (drm_probe_ddc(connector->ddc))
> -                       return connector_status_connected;
> -
> -               return connector_status_disconnected;
> -       }
> -
> -       return connector_status_unknown;
> -}
> -
> -static enum drm_connector_status
> -ls7a2000_hdmi1_connector_detect(struct drm_connector *connector, bool force)
> -{
> -       struct lsdc_device *ldev = to_lsdc(connector->dev);
> -       u32 val;
> -
> -       val = lsdc_rreg32(ldev, LSDC_HDMI_HPD_STATUS_REG);
> -
> -       if (val & HDMI1_HPD_FLAG)
> -               return connector_status_connected;
> -
> -       return connector_status_disconnected;
> -}
> -
> -static const struct drm_connector_funcs ls7a2000_hdmi_connector_funcs[2] = {
> -       {
> -               .detect = ls7a2000_hdmi0_vga_connector_detect,
> -               .fill_modes = drm_helper_probe_single_connector_modes,
> -               .destroy = drm_connector_cleanup,
> -               .reset = drm_atomic_helper_connector_reset,
> -               .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> -               .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> -               .debugfs_init = ls7a2000_hdmi0_late_register,
> -       },
> -       {
> -               .detect = ls7a2000_hdmi1_connector_detect,
> -               .fill_modes = drm_helper_probe_single_connector_modes,
> -               .destroy = drm_connector_cleanup,
> -               .reset = drm_atomic_helper_connector_reset,
> -               .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> -               .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> -               .debugfs_init = ls7a2000_hdmi1_late_register,
> -       },
> -};
> -
> -/* Even though some board has only one hdmi on display pipe 1,
> - * We still need hook lsdc_encoder_funcs up on display pipe 0,
> - * This is because we need its reset() callback get called, to
> - * set the LSDC_HDMIx_CTRL_REG using software gpio emulated i2c.
> - * Otherwise, the firmware may set LSDC_HDMIx_CTRL_REG blindly.
> - */
> -static void ls7a2000_hdmi0_encoder_reset(struct drm_encoder *encoder)
> -{
> -       struct drm_device *ddev = encoder->dev;
> -       struct lsdc_device *ldev = to_lsdc(ddev);
> -       u32 val;
> -
> -       val = PHY_CLOCK_POL | PHY_CLOCK_EN | PHY_DATA_EN;
> -       lsdc_wreg32(ldev, LSDC_CRTC0_DVO_CONF_REG, val);
> -
> -       /* using software gpio emulated i2c */
> -       val = lsdc_rreg32(ldev, LSDC_HDMI0_INTF_CTRL_REG);
> -       val &= ~HW_I2C_EN;
> -       lsdc_wreg32(ldev, LSDC_HDMI0_INTF_CTRL_REG, val);
> -
> -       /* help the hdmi phy to get out of reset state */
> -       lsdc_wreg32(ldev, LSDC_HDMI0_PHY_CTRL_REG, HDMI_PHY_RESET_N);
> -
> -       mdelay(20);
> -
> -       drm_dbg(ddev, "HDMI-0 Reset\n");
> -}
> -
> -static void ls7a2000_hdmi1_encoder_reset(struct drm_encoder *encoder)
> -{
> -       struct drm_device *ddev = encoder->dev;
> -       struct lsdc_device *ldev = to_lsdc(ddev);
> -       u32 val;
> -
> -       val = PHY_CLOCK_POL | PHY_CLOCK_EN | PHY_DATA_EN;
> -       lsdc_wreg32(ldev, LSDC_CRTC1_DVO_CONF_REG, val);
> -
> -       /* using software gpio emulated i2c */
> -       val = lsdc_rreg32(ldev, LSDC_HDMI1_INTF_CTRL_REG);
> -       val &= ~HW_I2C_EN;
> -       lsdc_wreg32(ldev, LSDC_HDMI1_INTF_CTRL_REG, val);
> -
> -       /*  help the hdmi phy to get out of reset state */
> -       lsdc_wreg32(ldev, LSDC_HDMI1_PHY_CTRL_REG, HDMI_PHY_RESET_N);
> -
> -       mdelay(20);
> -
> -       drm_dbg(ddev, "HDMI-1 Reset\n");
> -}
> -
> -static const struct drm_encoder_funcs ls7a2000_encoder_funcs[2] = {
> -       {
> -               .reset = ls7a2000_hdmi0_encoder_reset,
> -               .destroy = drm_encoder_cleanup,
> -       },
> -       {
> -               .reset = ls7a2000_hdmi1_encoder_reset,
> -               .destroy = drm_encoder_cleanup,
> -       },
> -};
> -
> -static int ls7a2000_hdmi_set_avi_infoframe(struct drm_encoder *encoder,
> -                                          struct drm_display_mode *mode)
> -{
> -       struct lsdc_output *output = encoder_to_lsdc_output(encoder);
> -       struct lsdc_display_pipe *dispipe = output_to_display_pipe(output);
> -       unsigned int index = dispipe->index;
> -       struct drm_device *ddev = encoder->dev;
> -       struct lsdc_device *ldev = to_lsdc(ddev);
> -       struct hdmi_avi_infoframe infoframe;
> -       u8 buffer[HDMI_INFOFRAME_SIZE(AVI)];
> -       unsigned char *ptr = &buffer[HDMI_INFOFRAME_HEADER_SIZE];
> -       unsigned int content0, content1, content2, content3;
> -       int err;
> -
> -       err = drm_hdmi_avi_infoframe_from_display_mode(&infoframe,
> -                                                      &output->connector,
> -                                                      mode);
> -       if (err < 0) {
> -               drm_err(ddev, "failed to setup AVI infoframe: %d\n", err);
> -               return err;
> -       }
> -
> -       /* Fixed infoframe configuration not linked to the mode */
> -       infoframe.colorspace = HDMI_COLORSPACE_RGB;
> -       infoframe.quantization_range = HDMI_QUANTIZATION_RANGE_DEFAULT;
> -       infoframe.colorimetry = HDMI_COLORIMETRY_NONE;
> -
> -       err = hdmi_avi_infoframe_pack(&infoframe, buffer, sizeof(buffer));
> -       if (err < 0) {
> -               drm_err(ddev, "failed to pack AVI infoframe: %d\n", err);
> -                       return err;
> -       }
> -
> -       content0 = *(unsigned int *)ptr;
> -       content1 = *(ptr + 4);
> -       content2 = *(unsigned int *)(ptr + 5);
> -       content3 = *(unsigned int *)(ptr + 9);
> -
> -       lsdc_pipe_wreg32(ldev, LSDC_HDMI0_AVI_CONTENT0, index, content0);
> -       lsdc_pipe_wreg32(ldev, LSDC_HDMI0_AVI_CONTENT1, index, content1);
> -       lsdc_pipe_wreg32(ldev, LSDC_HDMI0_AVI_CONTENT2, index, content2);
> -       lsdc_pipe_wreg32(ldev, LSDC_HDMI0_AVI_CONTENT3, index, content3);
> -
> -       lsdc_pipe_wreg32(ldev, LSDC_HDMI0_AVI_INFO_CRTL_REG, index,
> -                        AVI_PKT_ENABLE | AVI_PKT_UPDATE);
> -
> -       drm_dbg(ddev, "Update HDMI-%u avi infoframe\n", index);
> -
> -       return 0;
> -}
> -
> -static void ls7a2000_hdmi_atomic_disable(struct drm_encoder *encoder,
> -                                        struct drm_atomic_state *state)
> -{
> -       struct lsdc_output *output = encoder_to_lsdc_output(encoder);
> -       struct lsdc_display_pipe *dispipe = output_to_display_pipe(output);
> -       unsigned int index = dispipe->index;
> -       struct drm_device *ddev = encoder->dev;
> -       struct lsdc_device *ldev = to_lsdc(ddev);
> -       u32 val;
> -
> -       /* Disable the hdmi phy */
> -       val = lsdc_pipe_rreg32(ldev, LSDC_HDMI0_PHY_CTRL_REG, index);
> -       val &= ~HDMI_PHY_EN;
> -       lsdc_pipe_wreg32(ldev, LSDC_HDMI0_PHY_CTRL_REG, index, val);
> -
> -       /* Disable the hdmi interface */
> -       val = lsdc_pipe_rreg32(ldev, LSDC_HDMI0_INTF_CTRL_REG, index);
> -       val &= ~HDMI_INTERFACE_EN;
> -       lsdc_pipe_wreg32(ldev, LSDC_HDMI0_INTF_CTRL_REG, index, val);
> -
> -       drm_dbg(ddev, "HDMI-%u disabled\n", index);
> -}
> -
> -static void ls7a2000_hdmi_atomic_enable(struct drm_encoder *encoder,
> -                                       struct drm_atomic_state *state)
> -{
> -       struct drm_device *ddev = encoder->dev;
> -       struct lsdc_device *ldev = to_lsdc(ddev);
> -       struct lsdc_output *output = encoder_to_lsdc_output(encoder);
> -       struct lsdc_display_pipe *dispipe = output_to_display_pipe(output);
> -       unsigned int index = dispipe->index;
> -       u32 val;
> -
> -       /* datasheet say it should larger than 48 */
> -       val = 64 << HDMI_H_ZONE_IDLE_SHIFT | 64 << HDMI_V_ZONE_IDLE_SHIFT;
> -
> -       lsdc_pipe_wreg32(ldev, LSDC_HDMI0_ZONE_REG, index, val);
> -
> -       val = HDMI_PHY_TERM_STATUS |
> -             HDMI_PHY_TERM_DET_EN |
> -             HDMI_PHY_TERM_H_EN |
> -             HDMI_PHY_TERM_L_EN |
> -             HDMI_PHY_RESET_N |
> -             HDMI_PHY_EN;
> -
> -       lsdc_pipe_wreg32(ldev, LSDC_HDMI0_PHY_CTRL_REG, index, val);
> -
> -       udelay(2);
> -
> -       val = HDMI_CTL_PERIOD_MODE |
> -             HDMI_AUDIO_EN |
> -             HDMI_PACKET_EN |
> -             HDMI_INTERFACE_EN |
> -             (8 << HDMI_VIDEO_PREAMBLE_SHIFT);
> -
> -       lsdc_pipe_wreg32(ldev, LSDC_HDMI0_INTF_CTRL_REG, index, val);
> -
> -       drm_dbg(ddev, "HDMI-%u enabled\n", index);
> -}
> -
> -/*
> - *  Fout = M * Fin
> - *
> - *  M = (4 * LF) / (IDF * ODF)
> - *
> - *  IDF: Input Division Factor
> - *  ODF: Output Division Factor
> - *   LF: Loop Factor
> - *    M: Required Mult
> - *
> - *  +--------------------------------------------------------+
> - *  |     Fin (kHZ)     | M  | IDF | LF | ODF |   Fout(Mhz)  |
> - *  |-------------------+----+-----+----+-----+--------------|
> - *  |  170000 ~ 340000  | 10 | 16  | 40 |  1  | 1700 ~ 3400  |
> - *  |   85000 ~ 170000  | 10 |  8  | 40 |  2  |  850 ~ 1700  |
> - *  |   42500 ~  85000  | 10 |  4  | 40 |  4  |  425 ~ 850   |
> - *  |   21250 ~  42500  | 10 |  2  | 40 |  8  | 212.5 ~ 425  |
> - *  |   20000 ~  21250  | 10 |  1  | 40 | 16  |  200 ~ 212.5 |
> - *  +--------------------------------------------------------+
> - */
> -static void ls7a2000_hdmi_phy_pll_config(struct lsdc_device *ldev,
> -                                        int fin,
> -                                        unsigned int index)
> -{
> -       struct drm_device *ddev = &ldev->base;
> -       int count = 0;
> -       u32 val;
> -
> -       /* Firstly, disable phy pll */
> -       lsdc_pipe_wreg32(ldev, LSDC_HDMI0_PHY_PLL_REG, index, 0x0);
> -
> -       /*
> -        * Most of time, loongson HDMI require M = 10
> -        * for example, 10 = (4 * 40) / (8 * 2)
> -        * here, write "1" to the ODF will get "2"
> -        */
> -
> -       if (fin >= 170000)
> -               val = (16 << HDMI_PLL_IDF_SHIFT) |
> -                     (40 << HDMI_PLL_LF_SHIFT) |
> -                     (0 << HDMI_PLL_ODF_SHIFT);
> -       else if (fin >= 85000)
> -               val = (8 << HDMI_PLL_IDF_SHIFT) |
> -                     (40 << HDMI_PLL_LF_SHIFT) |
> -                     (1 << HDMI_PLL_ODF_SHIFT);
> -       else if (fin >= 42500)
> -               val = (4 << HDMI_PLL_IDF_SHIFT) |
> -                     (40 << HDMI_PLL_LF_SHIFT) |
> -                     (2 << HDMI_PLL_ODF_SHIFT);
> -       else if  (fin >= 21250)
> -               val = (2 << HDMI_PLL_IDF_SHIFT) |
> -                     (40 << HDMI_PLL_LF_SHIFT) |
> -                     (3 << HDMI_PLL_ODF_SHIFT);
> -       else
> -               val = (1 << HDMI_PLL_IDF_SHIFT) |
> -                     (40 << HDMI_PLL_LF_SHIFT) |
> -                     (4 << HDMI_PLL_ODF_SHIFT);
> -
> -       lsdc_pipe_wreg32(ldev, LSDC_HDMI0_PHY_PLL_REG, index, val);
> -
> -       val |= HDMI_PLL_ENABLE;
> -
> -       lsdc_pipe_wreg32(ldev, LSDC_HDMI0_PHY_PLL_REG, index, val);
> -
> -       udelay(2);
> -
> -       drm_dbg(ddev, "Fin of HDMI-%u: %d kHz\n", index, fin);
> -
> -       /* Wait hdmi phy pll lock */
> -       do {
> -               val = lsdc_pipe_rreg32(ldev, LSDC_HDMI0_PHY_PLL_REG, index);
> -
> -               if (val & HDMI_PLL_LOCKED) {
> -                       drm_dbg(ddev, "Setting HDMI-%u PLL take %d cycles\n",
> -                               index, count);
> -                       break;
> -               }
> -               ++count;
> -       } while (count < 1000);
> -
> -       lsdc_pipe_wreg32(ldev, LSDC_HDMI0_PHY_CAL_REG, index, 0x0f000ff0);
> -
> -       if (count >= 1000)
> -               drm_err(ddev, "Setting HDMI-%u PLL failed\n", index);
> -}
> -
> -static void ls7a2000_hdmi_atomic_mode_set(struct drm_encoder *encoder,
> -                                         struct drm_crtc_state *crtc_state,
> -                                         struct drm_connector_state *conn_state)
> -{
> -       struct lsdc_output *output = encoder_to_lsdc_output(encoder);
> -       struct lsdc_display_pipe *dispipe = output_to_display_pipe(output);
> -       unsigned int index = dispipe->index;
> -       struct drm_device *ddev = encoder->dev;
> -       struct lsdc_device *ldev = to_lsdc(ddev);
> -       struct drm_display_mode *mode = &crtc_state->mode;
> -
> -       ls7a2000_hdmi_phy_pll_config(ldev, mode->clock, index);
> -
> -       ls7a2000_hdmi_set_avi_infoframe(encoder, mode);
> -
> -       drm_dbg(ddev, "%s modeset finished\n", encoder->name);
> -}
> -
> -static const struct drm_encoder_helper_funcs ls7a2000_encoder_helper_funcs = {

If there are no references to this data piece, it means that it could
have been dropped in one of the earlier patches.

> -       .atomic_disable = ls7a2000_hdmi_atomic_disable,
> -       .atomic_enable = ls7a2000_hdmi_atomic_enable,
> -       .atomic_mode_set = ls7a2000_hdmi_atomic_mode_set,
> -};
> -
>  /* The built-in tranparent VGA encoder is only available on display pipe 0 */
>  static void ls7a2000_pipe0_vga_encoder_reset(struct drm_encoder *encoder)
>  {
> @@ -621,16 +162,6 @@ ls7a2000_query_output_configuration(struct drm_device *ddev, unsigned int pipe)
>         return NULL;
>  }
>
> -/*
> - * For LS7A2000:
> - *
> - * 1) Most of board export one vga + hdmi output interface.
> - * 2) Yet, Some boards export double hdmi output interface.
> - * 3) Still have boards export three output(2 hdmi + 1 vga).
> - *
> - * So let's hook hdmi helper funcs to all display pipe, don't miss.
> - * writing hdmi register do no harms.
> - */
>  int ls7a2000_output_init(struct drm_device *ddev,
>                          struct lsdc_display_pipe *dispipe,
>                          struct i2c_adapter *ddc,
> --
> 2.34.1
>


-- 
With best wishes
Dmitry

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