diff options
Diffstat (limited to 'drivers/gpu/drm/msm/dsi/dsi_host.c')
| -rw-r--r-- | drivers/gpu/drm/msm/dsi/dsi_host.c | 51 |
1 files changed, 35 insertions, 16 deletions
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c index deeecdfd6c4e..9d86a6aca6f2 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -183,16 +183,6 @@ struct msm_dsi_host { int irq; }; -static u32 dsi_get_bpp(const enum mipi_dsi_pixel_format fmt) -{ - switch (fmt) { - case MIPI_DSI_FMT_RGB565: return 16; - case MIPI_DSI_FMT_RGB666_PACKED: return 18; - case MIPI_DSI_FMT_RGB666: - case MIPI_DSI_FMT_RGB888: - default: return 24; - } -} static inline u32 dsi_read(struct msm_dsi_host *msm_host, u32 reg) { @@ -529,6 +519,25 @@ void dsi_link_clk_disable_v2(struct msm_dsi_host *msm_host) clk_disable_unprepare(msm_host->byte_clk); } +/** + * dsi_adjust_pclk_for_compression() - Adjust the pclk rate for compression case + * @mode: The selected mode for the DSI output + * @dsc: DRM DSC configuration for this DSI output + * + * Adjust the pclk rate by calculating a new hdisplay proportional to + * the compression ratio such that: + * new_hdisplay = old_hdisplay * compressed_bpp / uncompressed_bpp + * + * Porches do not need to be adjusted: + * - For VIDEO mode they are not compressed by DSC and are passed as is. + * - For CMD mode there are no actual porches. Instead these fields + * currently represent the overhead to the image data transfer. As such, they + * are calculated for the final mode parameters (after the compression) and + * are not to be adjusted too. + * + * FIXME: Reconsider this if/when CMD mode handling is rewritten to use + * transfer time and data overhead as a starting point of the calculations. + */ static unsigned long dsi_adjust_pclk_for_compression(const struct drm_display_mode *mode, const struct drm_dsc_config *dsc) { @@ -567,7 +576,7 @@ unsigned long dsi_byte_clk_get_rate(struct mipi_dsi_host *host, bool is_bonded_d { struct msm_dsi_host *msm_host = to_msm_dsi_host(host); u8 lanes = msm_host->lanes; - u32 bpp = dsi_get_bpp(msm_host->format); + u32 bpp = mipi_dsi_pixel_format_to_bpp(msm_host->format); unsigned long pclk_rate = dsi_get_pclk_rate(mode, msm_host->dsc, is_bonded_dsi); unsigned long pclk_bpp; @@ -610,7 +619,7 @@ int dsi_calc_clk_rate_6g(struct msm_dsi_host *msm_host, bool is_bonded_dsi) int dsi_calc_clk_rate_v2(struct msm_dsi_host *msm_host, bool is_bonded_dsi) { - u32 bpp = dsi_get_bpp(msm_host->format); + u32 bpp = mipi_dsi_pixel_format_to_bpp(msm_host->format); unsigned int esc_mhz, esc_div; unsigned long byte_mhz; @@ -951,8 +960,18 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi) if (ret) return; - /* Divide the display by 3 but keep back/font porch and - * pulse width same + /* + * DPU sends 3 bytes per pclk cycle to DSI. If widebus is + * enabled, bus width is extended to 6 bytes. + * + * Calculate the number of pclks needed to transmit one line of + * the compressed data. + + * The back/font porch and pulse width are kept intact. For + * VIDEO mode they represent timing parameters rather than + * actual data transfer, see the documentation for + * dsi_adjust_pclk_for_compression(). For CMD mode they are + * unused anyway. */ h_total -= hdisplay; if (wide_bus_enabled && !(msm_host->mode_flags & MIPI_DSI_MODE_VIDEO)) @@ -993,7 +1012,7 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi) /* image data and 1 byte write_memory_start cmd */ if (!msm_host->dsc) - wc = hdisplay * dsi_get_bpp(msm_host->format) / 8 + 1; + wc = hdisplay * mipi_dsi_pixel_format_to_bpp(msm_host->format) / 8 + 1; else /* * When DSC is enabled, WC = slice_chunk_size * slice_per_pkt + 1. @@ -1413,7 +1432,7 @@ static int dsi_cmds2buf_tx(struct msm_dsi_host *msm_host, { int len, ret; int bllp_len = msm_host->mode->hdisplay * - dsi_get_bpp(msm_host->format) / 8; + mipi_dsi_pixel_format_to_bpp(msm_host->format) / 8; len = dsi_cmd_dma_add(msm_host, msg); if (len < 0) { |