On Tue, Apr 29, 2014 at 10:20 AM, <srinivas.kandaga...@linaro.org> wrote:
> From: Srinivas Kandagatla <srinivas.kandaga...@linaro.org>
>
> MCICLK going to card bus is directly driven by the clock controller, so the
> driver has to set the required rates depending on the state of the card. This
> bit of support is very much similar to bypass mode but there is no such thing
> called bypass mode in MCICLK register of Qcom SD card controller. By default
> the clock is directly driven by the clk controller.
>
> This patch adds clock support for Qualcomm SDCC in the driver. This bit of
> code is conditioned on hw designer.
>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandaga...@linaro.org>
(...)
> + if (host->hw_designer == AMBA_VENDOR_QCOM) {
> + host->cclk = host->mclk;
> + } else if (desired >= host->mclk) {
Again refrain from hard-checking the vendor everywhere.
struct variant_data {
bool qcom_cclk_is_mclk;
(...)
As per example from st_clkdiv...
Then
if (host->vendor->qcom_cclk_is_mclk) {
(...)
}
> + if (ios->clock != host->mclk &&
> + host->hw_designer == AMBA_VENDOR_QCOM) {
> + /* Qcom MCLKCLK register does not define bypass bits */
> + int rc = clk_set_rate(host->clk, ios->clock);
> + if (rc < 0) {
> + dev_err(mmc_dev(host->mmc),
> + "Error setting clock rate (%d)\n", rc);
> + } else {
> + host->mclk = clk_get_rate(host->clk);
> + host->cclk = host->mclk;
> + }
> + }
For this I would define a vendor data like:
struct variant_data {
bool explicit_mclk_control;
(...)
Or something. It explains what is actually going on.
> if (plat->f_max)
> - mmc->f_max = min(host->mclk, plat->f_max);
> + mmc->f_max = (host->hw_designer == AMBA_VENDOR_QCOM) ?
> + plat->f_max : min(host->mclk, plat->f_max);
So rewrite like that:
if (host->vendor->explicit_mclk_control)
mmc->f_max = plat->f_max;
else
mmc->f_max = min(host->mclk, plat->f_max);
Yours,
Linus Walleij
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