| Message ID | 1401284862-16894-1-git-send-email-srinivas.kandagatla@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 28 May 2014 15:47, <srinivas.kandagatla@linaro.org> wrote: > From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> > > Some of the controller have maximum supported frequency, This patch adds > support in variant data structure to specify such restrictions. This > gives more flexibility in calculating the f_max before passing it to > mmc-core. > > Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> > --- > drivers/mmc/host/mmci.c | 14 ++++++++++++-- > 1 file changed, 12 insertions(+), 2 deletions(-) > > diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c > index fd40f9a..202f2d5 100644 > --- a/drivers/mmc/host/mmci.c > +++ b/drivers/mmc/host/mmci.c > @@ -67,6 +67,7 @@ static unsigned int fmax = 515633; > * @blksz_datactrl4: true if Block size is at b4..b16 position in datactrl > * register > * @pwrreg_powerup: power up value for MMCIPOWER register > + * @f_max: maximum clk frequency supported by the controller. > * @signal_direction: input/out direction of bus signals can be indicated > * @pwrreg_clkgate: MMCIPOWER register must be used to gate the clock > * @busy_detect: true if busy detection on dat0 is supported > @@ -87,6 +88,7 @@ struct variant_data { > bool blksz_datactrl16; > bool blksz_datactrl4; > u32 pwrreg_powerup; > + u32 f_max; > bool signal_direction; > bool pwrreg_clkgate; > bool busy_detect; > @@ -98,6 +100,7 @@ static struct variant_data variant_arm = { > .fifohalfsize = 8 * 4, > .datalength_bits = 16, > .pwrreg_powerup = MCI_PWR_UP, > + .f_max = 100000000, > }; > > static struct variant_data variant_arm_extended_fifo = { > @@ -105,6 +108,7 @@ static struct variant_data variant_arm_extended_fifo = { > .fifohalfsize = 64 * 4, > .datalength_bits = 16, > .pwrreg_powerup = MCI_PWR_UP, > + .f_max = 100000000, > }; > > static struct variant_data variant_arm_extended_fifo_hwfc = { > @@ -113,6 +117,7 @@ static struct variant_data variant_arm_extended_fifo_hwfc = { > .clkreg_enable = MCI_ARM_HWFCEN, > .datalength_bits = 16, > .pwrreg_powerup = MCI_PWR_UP, > + .f_max = 100000000, > }; > > static struct variant_data variant_u300 = { > @@ -123,6 +128,7 @@ static struct variant_data variant_u300 = { > .datalength_bits = 16, > .sdio = true, > .pwrreg_powerup = MCI_PWR_ON, > + .f_max = 100000000, > .signal_direction = true, > .pwrreg_clkgate = true, > .pwrreg_nopower = true, > @@ -136,6 +142,7 @@ static struct variant_data variant_nomadik = { > .sdio = true, > .st_clkdiv = true, > .pwrreg_powerup = MCI_PWR_ON, > + .f_max = 100000000, > .signal_direction = true, > .pwrreg_clkgate = true, > .pwrreg_nopower = true, > @@ -152,6 +159,7 @@ static struct variant_data variant_ux500 = { > .sdio = true, > .st_clkdiv = true, > .pwrreg_powerup = MCI_PWR_ON, > + .f_max = 100000000, > .signal_direction = true, > .pwrreg_clkgate = true, > .busy_detect = true, > @@ -171,6 +179,7 @@ static struct variant_data variant_ux500v2 = { > .st_clkdiv = true, > .blksz_datactrl16 = true, > .pwrreg_powerup = MCI_PWR_ON, > + .f_max = 100000000, > .signal_direction = true, > .pwrreg_clkgate = true, > .busy_detect = true, > @@ -189,6 +198,7 @@ static struct variant_data variant_qcom = { > .blksz_datactrl4 = true, > .datalength_bits = 24, > .pwrreg_powerup = MCI_PWR_UP, > + .f_max = 208000000, > }; > > static int mmci_card_busy(struct mmc_host *mmc) > @@ -1485,8 +1495,8 @@ static int mmci_probe(struct amba_device *dev, > * so we try to adjust the clock down to this, > * (if possible). > */ > - if (host->mclk > 100000000) { > - ret = clk_set_rate(host->clk, 100000000); > + if (host->mclk > host->variant->f_max) { You can use the local variant pointer directly, instead of host->variant. > + ret = clk_set_rate(host->clk, host->variant->f_max); > if (ret < 0) > goto clk_disable; > host->mclk = clk_get_rate(host->clk); > -- > 1.9.1 > Looks good otherwise! Kind regards Ulf Hansson -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Thanks Ulf, On 30/05/14 11:28, Ulf Hansson wrote: >> */ >> >- if (host->mclk > 100000000) { >> >- ret = clk_set_rate(host->clk, 100000000); >> >+ if (host->mclk > host->variant->f_max) { > You can use the local variant pointer directly, instead of host->variant. > yes, Will do that in next version. Thanks, srini >> >+ ret = clk_set_rate(host->clk, host->variant->f_max); >> > if (ret < 0) >> > goto clk_disable; >> > host->mclk = clk_get_rate(host->clk); >> >-- -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index fd40f9a..202f2d5 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -67,6 +67,7 @@ static unsigned int fmax = 515633; * @blksz_datactrl4: true if Block size is at b4..b16 position in datactrl * register * @pwrreg_powerup: power up value for MMCIPOWER register + * @f_max: maximum clk frequency supported by the controller. * @signal_direction: input/out direction of bus signals can be indicated * @pwrreg_clkgate: MMCIPOWER register must be used to gate the clock * @busy_detect: true if busy detection on dat0 is supported @@ -87,6 +88,7 @@ struct variant_data { bool blksz_datactrl16; bool blksz_datactrl4; u32 pwrreg_powerup; + u32 f_max; bool signal_direction; bool pwrreg_clkgate; bool busy_detect; @@ -98,6 +100,7 @@ static struct variant_data variant_arm = { .fifohalfsize = 8 * 4, .datalength_bits = 16, .pwrreg_powerup = MCI_PWR_UP, + .f_max = 100000000, }; static struct variant_data variant_arm_extended_fifo = { @@ -105,6 +108,7 @@ static struct variant_data variant_arm_extended_fifo = { .fifohalfsize = 64 * 4, .datalength_bits = 16, .pwrreg_powerup = MCI_PWR_UP, + .f_max = 100000000, }; static struct variant_data variant_arm_extended_fifo_hwfc = { @@ -113,6 +117,7 @@ static struct variant_data variant_arm_extended_fifo_hwfc = { .clkreg_enable = MCI_ARM_HWFCEN, .datalength_bits = 16, .pwrreg_powerup = MCI_PWR_UP, + .f_max = 100000000, }; static struct variant_data variant_u300 = { @@ -123,6 +128,7 @@ static struct variant_data variant_u300 = { .datalength_bits = 16, .sdio = true, .pwrreg_powerup = MCI_PWR_ON, + .f_max = 100000000, .signal_direction = true, .pwrreg_clkgate = true, .pwrreg_nopower = true, @@ -136,6 +142,7 @@ static struct variant_data variant_nomadik = { .sdio = true, .st_clkdiv = true, .pwrreg_powerup = MCI_PWR_ON, + .f_max = 100000000, .signal_direction = true, .pwrreg_clkgate = true, .pwrreg_nopower = true, @@ -152,6 +159,7 @@ static struct variant_data variant_ux500 = { .sdio = true, .st_clkdiv = true, .pwrreg_powerup = MCI_PWR_ON, + .f_max = 100000000, .signal_direction = true, .pwrreg_clkgate = true, .busy_detect = true, @@ -171,6 +179,7 @@ static struct variant_data variant_ux500v2 = { .st_clkdiv = true, .blksz_datactrl16 = true, .pwrreg_powerup = MCI_PWR_ON, + .f_max = 100000000, .signal_direction = true, .pwrreg_clkgate = true, .busy_detect = true, @@ -189,6 +198,7 @@ static struct variant_data variant_qcom = { .blksz_datactrl4 = true, .datalength_bits = 24, .pwrreg_powerup = MCI_PWR_UP, + .f_max = 208000000, }; static int mmci_card_busy(struct mmc_host *mmc) @@ -1485,8 +1495,8 @@ static int mmci_probe(struct amba_device *dev, * so we try to adjust the clock down to this, * (if possible). */ - if (host->mclk > 100000000) { - ret = clk_set_rate(host->clk, 100000000); + if (host->mclk > host->variant->f_max) { + ret = clk_set_rate(host->clk, host->variant->f_max); if (ret < 0) goto clk_disable; host->mclk = clk_get_rate(host->clk);