| Message ID | 20210304155144.2.Id492ddb6e2cdd05eb94474b93654b04b270c9bbe@changeid |
|---|---|
| State | New |
| Headers | show |
| Series | [1/3] drm/bridge: ti-sn65dsi86: Simplify refclk handling | expand |
On Thu 04 Mar 17:52 CST 2021, Douglas Anderson wrote: > This patch is _only_ code motion to prepare for the patch > ("drm/bridge: ti-sn65dsi86: Properly get the EDID, but only if > refclk") and make it easier to understand. > Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Regards, Bjorn > Signed-off-by: Douglas Anderson <dianders@chromium.org> > --- > > drivers/gpu/drm/bridge/ti-sn65dsi86.c | 196 +++++++++++++------------- > 1 file changed, 98 insertions(+), 98 deletions(-) > > diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > index 942019842ff4..491c9c4f32d1 100644 > --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > @@ -345,6 +345,104 @@ static int ti_sn_bridge_parse_regulators(struct ti_sn_bridge *pdata) > pdata->supplies); > } > > +static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn_bridge *pdata) > +{ > + u32 bit_rate_khz, clk_freq_khz; > + struct drm_display_mode *mode = > + &pdata->bridge.encoder->crtc->state->adjusted_mode; > + > + bit_rate_khz = mode->clock * > + mipi_dsi_pixel_format_to_bpp(pdata->dsi->format); > + clk_freq_khz = bit_rate_khz / (pdata->dsi->lanes * 2); > + > + return clk_freq_khz; > +} > + > +/* clk frequencies supported by bridge in Hz in case derived from REFCLK pin */ > +static const u32 ti_sn_bridge_refclk_lut[] = { > + 12000000, > + 19200000, > + 26000000, > + 27000000, > + 38400000, > +}; > + > +/* clk frequencies supported by bridge in Hz in case derived from DACP/N pin */ > +static const u32 ti_sn_bridge_dsiclk_lut[] = { > + 468000000, > + 384000000, > + 416000000, > + 486000000, > + 460800000, > +}; > + > +static void ti_sn_bridge_set_refclk_freq(struct ti_sn_bridge *pdata) > +{ > + int i; > + u32 refclk_rate; > + const u32 *refclk_lut; > + size_t refclk_lut_size; > + > + if (pdata->refclk) { > + refclk_rate = clk_get_rate(pdata->refclk); > + refclk_lut = ti_sn_bridge_refclk_lut; > + refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_refclk_lut); > + clk_prepare_enable(pdata->refclk); > + } else { > + refclk_rate = ti_sn_bridge_get_dsi_freq(pdata) * 1000; > + refclk_lut = ti_sn_bridge_dsiclk_lut; > + refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_dsiclk_lut); > + } > + > + /* for i equals to refclk_lut_size means default frequency */ > + for (i = 0; i < refclk_lut_size; i++) > + if (refclk_lut[i] == refclk_rate) > + break; > + > + regmap_update_bits(pdata->regmap, SN_DPPLL_SRC_REG, REFCLK_FREQ_MASK, > + REFCLK_FREQ(i)); > +} > + > +static void ti_sn_bridge_post_disable(struct drm_bridge *bridge) > +{ > + struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge); > + > + clk_disable_unprepare(pdata->refclk); > + > + pm_runtime_put_sync(pdata->dev); > +} > + > +static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge) > +{ > + struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge); > + > + pm_runtime_get_sync(pdata->dev); > + > + /* configure bridge ref_clk */ > + ti_sn_bridge_set_refclk_freq(pdata); > + > + /* > + * HPD on this bridge chip is a bit useless. This is an eDP bridge > + * so the HPD is an internal signal that's only there to signal that > + * the panel is done powering up. ...but the bridge chip debounces > + * this signal by between 100 ms and 400 ms (depending on process, > + * voltage, and temperate--I measured it at about 200 ms). One > + * particular panel asserted HPD 84 ms after it was powered on meaning > + * that we saw HPD 284 ms after power on. ...but the same panel said > + * that instead of looking at HPD you could just hardcode a delay of > + * 200 ms. We'll assume that the panel driver will have the hardcoded > + * delay in its prepare and always disable HPD. > + * > + * If HPD somehow makes sense on some future panel we'll have to > + * change this to be conditional on someone specifying that HPD should > + * be used. > + */ > + regmap_update_bits(pdata->regmap, SN_HPD_DISABLE_REG, HPD_DISABLE, > + HPD_DISABLE); > + > + drm_panel_prepare(pdata->panel); > +} > + > static int ti_sn_bridge_attach(struct drm_bridge *bridge, > enum drm_bridge_attach_flags flags) > { > @@ -443,64 +541,6 @@ static void ti_sn_bridge_disable(struct drm_bridge *bridge) > drm_panel_unprepare(pdata->panel); > } > > -static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn_bridge *pdata) > -{ > - u32 bit_rate_khz, clk_freq_khz; > - struct drm_display_mode *mode = > - &pdata->bridge.encoder->crtc->state->adjusted_mode; > - > - bit_rate_khz = mode->clock * > - mipi_dsi_pixel_format_to_bpp(pdata->dsi->format); > - clk_freq_khz = bit_rate_khz / (pdata->dsi->lanes * 2); > - > - return clk_freq_khz; > -} > - > -/* clk frequencies supported by bridge in Hz in case derived from REFCLK pin */ > -static const u32 ti_sn_bridge_refclk_lut[] = { > - 12000000, > - 19200000, > - 26000000, > - 27000000, > - 38400000, > -}; > - > -/* clk frequencies supported by bridge in Hz in case derived from DACP/N pin */ > -static const u32 ti_sn_bridge_dsiclk_lut[] = { > - 468000000, > - 384000000, > - 416000000, > - 486000000, > - 460800000, > -}; > - > -static void ti_sn_bridge_set_refclk_freq(struct ti_sn_bridge *pdata) > -{ > - int i; > - u32 refclk_rate; > - const u32 *refclk_lut; > - size_t refclk_lut_size; > - > - if (pdata->refclk) { > - refclk_rate = clk_get_rate(pdata->refclk); > - refclk_lut = ti_sn_bridge_refclk_lut; > - refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_refclk_lut); > - clk_prepare_enable(pdata->refclk); > - } else { > - refclk_rate = ti_sn_bridge_get_dsi_freq(pdata) * 1000; > - refclk_lut = ti_sn_bridge_dsiclk_lut; > - refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_dsiclk_lut); > - } > - > - /* for i equals to refclk_lut_size means default frequency */ > - for (i = 0; i < refclk_lut_size; i++) > - if (refclk_lut[i] == refclk_rate) > - break; > - > - regmap_update_bits(pdata->regmap, SN_DPPLL_SRC_REG, REFCLK_FREQ_MASK, > - REFCLK_FREQ(i)); > -} > - > static void ti_sn_bridge_set_dsi_rate(struct ti_sn_bridge *pdata) > { > unsigned int bit_rate_mhz, clk_freq_mhz; > @@ -821,46 +861,6 @@ static void ti_sn_bridge_enable(struct drm_bridge *bridge) > drm_panel_enable(pdata->panel); > } > > -static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge) > -{ > - struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge); > - > - pm_runtime_get_sync(pdata->dev); > - > - /* configure bridge ref_clk */ > - ti_sn_bridge_set_refclk_freq(pdata); > - > - /* > - * HPD on this bridge chip is a bit useless. This is an eDP bridge > - * so the HPD is an internal signal that's only there to signal that > - * the panel is done powering up. ...but the bridge chip debounces > - * this signal by between 100 ms and 400 ms (depending on process, > - * voltage, and temperate--I measured it at about 200 ms). One > - * particular panel asserted HPD 84 ms after it was powered on meaning > - * that we saw HPD 284 ms after power on. ...but the same panel said > - * that instead of looking at HPD you could just hardcode a delay of > - * 200 ms. We'll assume that the panel driver will have the hardcoded > - * delay in its prepare and always disable HPD. > - * > - * If HPD somehow makes sense on some future panel we'll have to > - * change this to be conditional on someone specifying that HPD should > - * be used. > - */ > - regmap_update_bits(pdata->regmap, SN_HPD_DISABLE_REG, HPD_DISABLE, > - HPD_DISABLE); > - > - drm_panel_prepare(pdata->panel); > -} > - > -static void ti_sn_bridge_post_disable(struct drm_bridge *bridge) > -{ > - struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge); > - > - clk_disable_unprepare(pdata->refclk); > - > - pm_runtime_put_sync(pdata->dev); > -} > - > static const struct drm_bridge_funcs ti_sn_bridge_funcs = { > .attach = ti_sn_bridge_attach, > .pre_enable = ti_sn_bridge_pre_enable, > -- > 2.30.1.766.gb4fecdf3b7-goog >
Hi Douglas, Thank you for the patch. On Thu, Mar 04, 2021 at 03:52:00PM -0800, Douglas Anderson wrote: > This patch is _only_ code motion to prepare for the patch > ("drm/bridge: ti-sn65dsi86: Properly get the EDID, but only if > refclk") and make it easier to understand. s/make/makes/ > > Signed-off-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > --- > > drivers/gpu/drm/bridge/ti-sn65dsi86.c | 196 +++++++++++++------------- > 1 file changed, 98 insertions(+), 98 deletions(-) > > diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > index 942019842ff4..491c9c4f32d1 100644 > --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > @@ -345,6 +345,104 @@ static int ti_sn_bridge_parse_regulators(struct ti_sn_bridge *pdata) > pdata->supplies); > } > > +static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn_bridge *pdata) > +{ > + u32 bit_rate_khz, clk_freq_khz; > + struct drm_display_mode *mode = > + &pdata->bridge.encoder->crtc->state->adjusted_mode; > + > + bit_rate_khz = mode->clock * > + mipi_dsi_pixel_format_to_bpp(pdata->dsi->format); > + clk_freq_khz = bit_rate_khz / (pdata->dsi->lanes * 2); > + > + return clk_freq_khz; > +} > + > +/* clk frequencies supported by bridge in Hz in case derived from REFCLK pin */ > +static const u32 ti_sn_bridge_refclk_lut[] = { > + 12000000, > + 19200000, > + 26000000, > + 27000000, > + 38400000, > +}; > + > +/* clk frequencies supported by bridge in Hz in case derived from DACP/N pin */ > +static const u32 ti_sn_bridge_dsiclk_lut[] = { > + 468000000, > + 384000000, > + 416000000, > + 486000000, > + 460800000, > +}; > + > +static void ti_sn_bridge_set_refclk_freq(struct ti_sn_bridge *pdata) > +{ > + int i; > + u32 refclk_rate; > + const u32 *refclk_lut; > + size_t refclk_lut_size; > + > + if (pdata->refclk) { > + refclk_rate = clk_get_rate(pdata->refclk); > + refclk_lut = ti_sn_bridge_refclk_lut; > + refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_refclk_lut); > + clk_prepare_enable(pdata->refclk); > + } else { > + refclk_rate = ti_sn_bridge_get_dsi_freq(pdata) * 1000; > + refclk_lut = ti_sn_bridge_dsiclk_lut; > + refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_dsiclk_lut); > + } > + > + /* for i equals to refclk_lut_size means default frequency */ > + for (i = 0; i < refclk_lut_size; i++) > + if (refclk_lut[i] == refclk_rate) > + break; > + > + regmap_update_bits(pdata->regmap, SN_DPPLL_SRC_REG, REFCLK_FREQ_MASK, > + REFCLK_FREQ(i)); > +} > + > +static void ti_sn_bridge_post_disable(struct drm_bridge *bridge) > +{ > + struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge); > + > + clk_disable_unprepare(pdata->refclk); > + > + pm_runtime_put_sync(pdata->dev); > +} > + > +static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge) > +{ > + struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge); > + > + pm_runtime_get_sync(pdata->dev); > + > + /* configure bridge ref_clk */ > + ti_sn_bridge_set_refclk_freq(pdata); > + > + /* > + * HPD on this bridge chip is a bit useless. This is an eDP bridge > + * so the HPD is an internal signal that's only there to signal that > + * the panel is done powering up. ...but the bridge chip debounces > + * this signal by between 100 ms and 400 ms (depending on process, > + * voltage, and temperate--I measured it at about 200 ms). One > + * particular panel asserted HPD 84 ms after it was powered on meaning > + * that we saw HPD 284 ms after power on. ...but the same panel said > + * that instead of looking at HPD you could just hardcode a delay of > + * 200 ms. We'll assume that the panel driver will have the hardcoded > + * delay in its prepare and always disable HPD. > + * > + * If HPD somehow makes sense on some future panel we'll have to > + * change this to be conditional on someone specifying that HPD should > + * be used. > + */ > + regmap_update_bits(pdata->regmap, SN_HPD_DISABLE_REG, HPD_DISABLE, > + HPD_DISABLE); > + > + drm_panel_prepare(pdata->panel); > +} > + > static int ti_sn_bridge_attach(struct drm_bridge *bridge, > enum drm_bridge_attach_flags flags) > { > @@ -443,64 +541,6 @@ static void ti_sn_bridge_disable(struct drm_bridge *bridge) > drm_panel_unprepare(pdata->panel); > } > > -static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn_bridge *pdata) > -{ > - u32 bit_rate_khz, clk_freq_khz; > - struct drm_display_mode *mode = > - &pdata->bridge.encoder->crtc->state->adjusted_mode; > - > - bit_rate_khz = mode->clock * > - mipi_dsi_pixel_format_to_bpp(pdata->dsi->format); > - clk_freq_khz = bit_rate_khz / (pdata->dsi->lanes * 2); > - > - return clk_freq_khz; > -} > - > -/* clk frequencies supported by bridge in Hz in case derived from REFCLK pin */ > -static const u32 ti_sn_bridge_refclk_lut[] = { > - 12000000, > - 19200000, > - 26000000, > - 27000000, > - 38400000, > -}; > - > -/* clk frequencies supported by bridge in Hz in case derived from DACP/N pin */ > -static const u32 ti_sn_bridge_dsiclk_lut[] = { > - 468000000, > - 384000000, > - 416000000, > - 486000000, > - 460800000, > -}; > - > -static void ti_sn_bridge_set_refclk_freq(struct ti_sn_bridge *pdata) > -{ > - int i; > - u32 refclk_rate; > - const u32 *refclk_lut; > - size_t refclk_lut_size; > - > - if (pdata->refclk) { > - refclk_rate = clk_get_rate(pdata->refclk); > - refclk_lut = ti_sn_bridge_refclk_lut; > - refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_refclk_lut); > - clk_prepare_enable(pdata->refclk); > - } else { > - refclk_rate = ti_sn_bridge_get_dsi_freq(pdata) * 1000; > - refclk_lut = ti_sn_bridge_dsiclk_lut; > - refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_dsiclk_lut); > - } > - > - /* for i equals to refclk_lut_size means default frequency */ > - for (i = 0; i < refclk_lut_size; i++) > - if (refclk_lut[i] == refclk_rate) > - break; > - > - regmap_update_bits(pdata->regmap, SN_DPPLL_SRC_REG, REFCLK_FREQ_MASK, > - REFCLK_FREQ(i)); > -} > - > static void ti_sn_bridge_set_dsi_rate(struct ti_sn_bridge *pdata) > { > unsigned int bit_rate_mhz, clk_freq_mhz; > @@ -821,46 +861,6 @@ static void ti_sn_bridge_enable(struct drm_bridge *bridge) > drm_panel_enable(pdata->panel); > } > > -static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge) > -{ > - struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge); > - > - pm_runtime_get_sync(pdata->dev); > - > - /* configure bridge ref_clk */ > - ti_sn_bridge_set_refclk_freq(pdata); > - > - /* > - * HPD on this bridge chip is a bit useless. This is an eDP bridge > - * so the HPD is an internal signal that's only there to signal that > - * the panel is done powering up. ...but the bridge chip debounces > - * this signal by between 100 ms and 400 ms (depending on process, > - * voltage, and temperate--I measured it at about 200 ms). One > - * particular panel asserted HPD 84 ms after it was powered on meaning > - * that we saw HPD 284 ms after power on. ...but the same panel said > - * that instead of looking at HPD you could just hardcode a delay of > - * 200 ms. We'll assume that the panel driver will have the hardcoded > - * delay in its prepare and always disable HPD. > - * > - * If HPD somehow makes sense on some future panel we'll have to > - * change this to be conditional on someone specifying that HPD should > - * be used. > - */ > - regmap_update_bits(pdata->regmap, SN_HPD_DISABLE_REG, HPD_DISABLE, > - HPD_DISABLE); > - > - drm_panel_prepare(pdata->panel); > -} > - > -static void ti_sn_bridge_post_disable(struct drm_bridge *bridge) > -{ > - struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge); > - > - clk_disable_unprepare(pdata->refclk); > - > - pm_runtime_put_sync(pdata->dev); > -} > - > static const struct drm_bridge_funcs ti_sn_bridge_funcs = { > .attach = ti_sn_bridge_attach, > .pre_enable = ti_sn_bridge_pre_enable,
Hi, On Sat, Mar 13, 2021 at 1:13 PM Laurent Pinchart <laurent.pinchart@ideasonboard.com> wrote: > > Hi Douglas, > > Thank you for the patch. > > On Thu, Mar 04, 2021 at 03:52:00PM -0800, Douglas Anderson wrote: > > This patch is _only_ code motion to prepare for the patch > > ("drm/bridge: ti-sn65dsi86: Properly get the EDID, but only if > > refclk") and make it easier to understand. > > s/make/makes/ I was never an expert at grammar, but I think either "make" or "makes" are fine. Simple version with parenthesis: Mine: This patch is <blah> to (prepare for the patch <blah>) and (make it easier to understand). Yours: This patch is <blah> (to prepare for the patch <blah>) and (makes it easier to understand). I suppose also valid would be: This patch is <blah> (to prepare for the patch <blah>) and (to make it easier to understand). In any case if/when I spin this patch I'm fine changing it to your version just because (as I understand) it's equally valid and maybe looks slightly better? > > Signed-off-by: Douglas Anderson <dianders@chromium.org> > > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Thanks for the reviews! -Doug
Hi Doug, On Mon, Mar 15, 2021 at 09:31:41AM -0700, Doug Anderson wrote: > On Sat, Mar 13, 2021 at 1:13 PM Laurent Pinchart wrote: > > On Thu, Mar 04, 2021 at 03:52:00PM -0800, Douglas Anderson wrote: > > > This patch is _only_ code motion to prepare for the patch > > > ("drm/bridge: ti-sn65dsi86: Properly get the EDID, but only if > > > refclk") and make it easier to understand. > > > > s/make/makes/ > > I was never an expert at grammar, but I think either "make" or "makes" > are fine. Simple version with parenthesis: > > Mine: > > This patch is <blah> to (prepare for the patch <blah>) and (make it > easier to understand). > > Yours: > > This patch is <blah> (to prepare for the patch <blah>) and (makes it > easier to understand). > > I suppose also valid would be: > > This patch is <blah> (to prepare for the patch <blah>) and (to make it > easier to understand). Your absolutely right. Both versions are fine, and your preferred version is best :-) > In any case if/when I spin this patch I'm fine changing it to your > version just because (as I understand) it's equally valid and maybe > looks slightly better? > > > > Signed-off-by: Douglas Anderson <dianders@chromium.org> > > > > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > > Thanks for the reviews!
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index 942019842ff4..491c9c4f32d1 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -345,6 +345,104 @@ static int ti_sn_bridge_parse_regulators(struct ti_sn_bridge *pdata) pdata->supplies); } +static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn_bridge *pdata) +{ + u32 bit_rate_khz, clk_freq_khz; + struct drm_display_mode *mode = + &pdata->bridge.encoder->crtc->state->adjusted_mode; + + bit_rate_khz = mode->clock * + mipi_dsi_pixel_format_to_bpp(pdata->dsi->format); + clk_freq_khz = bit_rate_khz / (pdata->dsi->lanes * 2); + + return clk_freq_khz; +} + +/* clk frequencies supported by bridge in Hz in case derived from REFCLK pin */ +static const u32 ti_sn_bridge_refclk_lut[] = { + 12000000, + 19200000, + 26000000, + 27000000, + 38400000, +}; + +/* clk frequencies supported by bridge in Hz in case derived from DACP/N pin */ +static const u32 ti_sn_bridge_dsiclk_lut[] = { + 468000000, + 384000000, + 416000000, + 486000000, + 460800000, +}; + +static void ti_sn_bridge_set_refclk_freq(struct ti_sn_bridge *pdata) +{ + int i; + u32 refclk_rate; + const u32 *refclk_lut; + size_t refclk_lut_size; + + if (pdata->refclk) { + refclk_rate = clk_get_rate(pdata->refclk); + refclk_lut = ti_sn_bridge_refclk_lut; + refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_refclk_lut); + clk_prepare_enable(pdata->refclk); + } else { + refclk_rate = ti_sn_bridge_get_dsi_freq(pdata) * 1000; + refclk_lut = ti_sn_bridge_dsiclk_lut; + refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_dsiclk_lut); + } + + /* for i equals to refclk_lut_size means default frequency */ + for (i = 0; i < refclk_lut_size; i++) + if (refclk_lut[i] == refclk_rate) + break; + + regmap_update_bits(pdata->regmap, SN_DPPLL_SRC_REG, REFCLK_FREQ_MASK, + REFCLK_FREQ(i)); +} + +static void ti_sn_bridge_post_disable(struct drm_bridge *bridge) +{ + struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge); + + clk_disable_unprepare(pdata->refclk); + + pm_runtime_put_sync(pdata->dev); +} + +static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge) +{ + struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge); + + pm_runtime_get_sync(pdata->dev); + + /* configure bridge ref_clk */ + ti_sn_bridge_set_refclk_freq(pdata); + + /* + * HPD on this bridge chip is a bit useless. This is an eDP bridge + * so the HPD is an internal signal that's only there to signal that + * the panel is done powering up. ...but the bridge chip debounces + * this signal by between 100 ms and 400 ms (depending on process, + * voltage, and temperate--I measured it at about 200 ms). One + * particular panel asserted HPD 84 ms after it was powered on meaning + * that we saw HPD 284 ms after power on. ...but the same panel said + * that instead of looking at HPD you could just hardcode a delay of + * 200 ms. We'll assume that the panel driver will have the hardcoded + * delay in its prepare and always disable HPD. + * + * If HPD somehow makes sense on some future panel we'll have to + * change this to be conditional on someone specifying that HPD should + * be used. + */ + regmap_update_bits(pdata->regmap, SN_HPD_DISABLE_REG, HPD_DISABLE, + HPD_DISABLE); + + drm_panel_prepare(pdata->panel); +} + static int ti_sn_bridge_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags) { @@ -443,64 +541,6 @@ static void ti_sn_bridge_disable(struct drm_bridge *bridge) drm_panel_unprepare(pdata->panel); } -static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn_bridge *pdata) -{ - u32 bit_rate_khz, clk_freq_khz; - struct drm_display_mode *mode = - &pdata->bridge.encoder->crtc->state->adjusted_mode; - - bit_rate_khz = mode->clock * - mipi_dsi_pixel_format_to_bpp(pdata->dsi->format); - clk_freq_khz = bit_rate_khz / (pdata->dsi->lanes * 2); - - return clk_freq_khz; -} - -/* clk frequencies supported by bridge in Hz in case derived from REFCLK pin */ -static const u32 ti_sn_bridge_refclk_lut[] = { - 12000000, - 19200000, - 26000000, - 27000000, - 38400000, -}; - -/* clk frequencies supported by bridge in Hz in case derived from DACP/N pin */ -static const u32 ti_sn_bridge_dsiclk_lut[] = { - 468000000, - 384000000, - 416000000, - 486000000, - 460800000, -}; - -static void ti_sn_bridge_set_refclk_freq(struct ti_sn_bridge *pdata) -{ - int i; - u32 refclk_rate; - const u32 *refclk_lut; - size_t refclk_lut_size; - - if (pdata->refclk) { - refclk_rate = clk_get_rate(pdata->refclk); - refclk_lut = ti_sn_bridge_refclk_lut; - refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_refclk_lut); - clk_prepare_enable(pdata->refclk); - } else { - refclk_rate = ti_sn_bridge_get_dsi_freq(pdata) * 1000; - refclk_lut = ti_sn_bridge_dsiclk_lut; - refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_dsiclk_lut); - } - - /* for i equals to refclk_lut_size means default frequency */ - for (i = 0; i < refclk_lut_size; i++) - if (refclk_lut[i] == refclk_rate) - break; - - regmap_update_bits(pdata->regmap, SN_DPPLL_SRC_REG, REFCLK_FREQ_MASK, - REFCLK_FREQ(i)); -} - static void ti_sn_bridge_set_dsi_rate(struct ti_sn_bridge *pdata) { unsigned int bit_rate_mhz, clk_freq_mhz; @@ -821,46 +861,6 @@ static void ti_sn_bridge_enable(struct drm_bridge *bridge) drm_panel_enable(pdata->panel); } -static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge) -{ - struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge); - - pm_runtime_get_sync(pdata->dev); - - /* configure bridge ref_clk */ - ti_sn_bridge_set_refclk_freq(pdata); - - /* - * HPD on this bridge chip is a bit useless. This is an eDP bridge - * so the HPD is an internal signal that's only there to signal that - * the panel is done powering up. ...but the bridge chip debounces - * this signal by between 100 ms and 400 ms (depending on process, - * voltage, and temperate--I measured it at about 200 ms). One - * particular panel asserted HPD 84 ms after it was powered on meaning - * that we saw HPD 284 ms after power on. ...but the same panel said - * that instead of looking at HPD you could just hardcode a delay of - * 200 ms. We'll assume that the panel driver will have the hardcoded - * delay in its prepare and always disable HPD. - * - * If HPD somehow makes sense on some future panel we'll have to - * change this to be conditional on someone specifying that HPD should - * be used. - */ - regmap_update_bits(pdata->regmap, SN_HPD_DISABLE_REG, HPD_DISABLE, - HPD_DISABLE); - - drm_panel_prepare(pdata->panel); -} - -static void ti_sn_bridge_post_disable(struct drm_bridge *bridge) -{ - struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge); - - clk_disable_unprepare(pdata->refclk); - - pm_runtime_put_sync(pdata->dev); -} - static const struct drm_bridge_funcs ti_sn_bridge_funcs = { .attach = ti_sn_bridge_attach, .pre_enable = ti_sn_bridge_pre_enable,
This patch is _only_ code motion to prepare for the patch ("drm/bridge: ti-sn65dsi86: Properly get the EDID, but only if refclk") and make it easier to understand. Signed-off-by: Douglas Anderson <dianders@chromium.org> --- drivers/gpu/drm/bridge/ti-sn65dsi86.c | 196 +++++++++++++------------- 1 file changed, 98 insertions(+), 98 deletions(-)