diff options
Diffstat (limited to 'drivers/gpu/drm/drm_scdc_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_scdc_helper.c | 33 |
1 files changed, 20 insertions, 13 deletions
diff --git a/drivers/gpu/drm/drm_scdc_helper.c b/drivers/gpu/drm/drm_scdc_helper.c index 3cd96a95736d..7d1b0f011d33 100644 --- a/drivers/gpu/drm/drm_scdc_helper.c +++ b/drivers/gpu/drm/drm_scdc_helper.c @@ -194,19 +194,26 @@ EXPORT_SYMBOL(drm_scdc_set_scrambling); * @adapter: I2C adapter for DDC channel * @set: ret or reset the high clock ratio * - * TMDS clock ratio calculations go like this: - * TMDS character = 10 bit TMDS encoded value - * TMDS character rate = The rate at which TMDS characters are transmitted(Mcsc) - * TMDS bit rate = 10x TMDS character rate - * As per the spec: - * TMDS clock rate for pixel clock < 340 MHz = 1x the character rate - * = 1/10 pixel clock rate - * TMDS clock rate for pixel clock > 340 MHz = 0.25x the character rate - * = 1/40 pixel clock rate - * - * Writes to the TMDS config register over SCDC channel, and: - * sets TMDS clock ratio to 1/40 when set = 1 - * sets TMDS clock ratio to 1/10 when set = 0 + * + * TMDS clock ratio calculations go like this: + * TMDS character = 10 bit TMDS encoded value + * + * TMDS character rate = The rate at which TMDS characters are + * transmitted (Mcsc) + * + * TMDS bit rate = 10x TMDS character rate + * + * As per the spec: + * TMDS clock rate for pixel clock < 340 MHz = 1x the character + * rate = 1/10 pixel clock rate + * + * TMDS clock rate for pixel clock > 340 MHz = 0.25x the character + * rate = 1/40 pixel clock rate + * + * Writes to the TMDS config register over SCDC channel, and: + * sets TMDS clock ratio to 1/40 when set = 1 + * + * sets TMDS clock ratio to 1/10 when set = 0 * * Returns: * True if write is successful, false otherwise. |