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Date: Tue, 05 Jan 2010 05:58:34 +0800
From: Hein_Tibosch <hein_tibosch@...oo.es>
To: Pierre Ossman <pierre@...man.eu>
CC: Ben Nizette <bn@...sdigital.com>,
Sascha Hauer <s.hauer@...gutronix.de>,
Adrian Hunter <adrian.hunter@...ia.com>,
linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
Matt Fleming <matt@...sole-pimps.org>
Subject: Re: [PATCH v3] mmc: Make ID freq configurable
In my last mail the spaces in the patch were mistreated, sorry for that.
Below a patch which tries mmc-initialization using several frequencies
from an array 400, 300, 200 and 100.
Signed-off-by: Hein Tibosch <hein_tibosch@...oo.es>
---
diff -Nurp a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -891,12 +891,7 @@ static void mmc_power_up(struct mmc_host
*/
mmc_delay(10);
- if (host->f_min > 400000) {
- pr_warning("%s: Minimum clock frequency too high for "
- "identification mode\n", mmc_hostname(host));
- host->ios.clock = host->f_min;
- } else
- host->ios.clock = 400000;
+ host->ios.clock = host->f_init;
host->ios.power_mode = MMC_POWER_ON;
mmc_set_ios(host);
@@ -1041,6 +1036,8 @@ void mmc_rescan(struct work_struct *work
container_of(work, struct mmc_host, detect.work);
u32 ocr;
int err;
+ int i;
+ unsigned freqs[] = { 400000, 300000, 200000, 100000 };
mmc_bus_get(host);
@@ -1070,46 +1067,55 @@ void mmc_rescan(struct work_struct *work
if (host->ops->get_cd && host->ops->get_cd(host) == 0)
goto out;
- mmc_claim_host(host);
+ for (i = 0; i < ARRAY_SIZE(freqs); i++) {
+ mmc_claim_host(host);
- mmc_power_up(host);
- mmc_go_idle(host);
+ if (freqs[i] >= host->f_min)
+ host->f_init = freqs[i];
+ else if (i && freqs[i-1] <= host->f_min)
+ goto out;
+ else
+ host->f_init = host->f_min;
- mmc_send_if_cond(host, host->ocr_avail);
+ printk ("mmc_rescan: trying %u Hz\n", host->f_init);
+ mmc_power_up(host);
+ mmc_go_idle(host);
- /*
- * First we search for SDIO...
- */
- err = mmc_send_io_op_cond(host, 0, &ocr);
- if (!err) {
- if (mmc_attach_sdio(host, ocr))
- mmc_power_off(host);
- goto out;
- }
+ mmc_send_if_cond(host, host->ocr_avail);
- /*
- * ...then normal SD...
- */
- err = mmc_send_app_op_cond(host, 0, &ocr);
- if (!err) {
- if (mmc_attach_sd(host, ocr))
- mmc_power_off(host);
- goto out;
- }
+ /*
+ * First we search for SDIO...
+ */
+ err = mmc_send_io_op_cond(host, 0, &ocr);
+ if (!err) {
+ if (mmc_attach_sdio(host, ocr))
+ mmc_power_off(host);
+ goto out;
+ }
- /*
- * ...and finally MMC.
- */
- err = mmc_send_op_cond(host, 0, &ocr);
- if (!err) {
- if (mmc_attach_mmc(host, ocr))
- mmc_power_off(host);
- goto out;
- }
+ /*
+ * ...then normal SD...
+ */
+ err = mmc_send_app_op_cond(host, 0, &ocr);
+ if (!err) {
+ if (mmc_attach_sd(host, ocr))
+ mmc_power_off(host);
+ goto out;
+ }
- mmc_release_host(host);
- mmc_power_off(host);
+ /*
+ * ...and finally MMC.
+ */
+ err = mmc_send_op_cond(host, 0, &ocr);
+ if (!err) {
+ if (mmc_attach_mmc(host, ocr))
+ mmc_power_off(host);
+ goto out;
+ }
+ mmc_release_host(host);
+ mmc_power_off(host);
+ }
out:
if (host->caps & MMC_CAP_NEEDS_POLL)
mmc_schedule_delayed_work(&host->detect, HZ);
diff -Nurp a/include/linux/mmc/host.h b/include/linux/mmc/host.h
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -119,6 +119,7 @@ struct mmc_host {
const struct mmc_host_ops *ops;
unsigned int f_min;
unsigned int f_max;
+ unsigned int f_init;
u32 ocr_avail;
#define MMC_VDD_165_195 0x00000080 /* VDD voltage 1.65 - 1.95 */
--
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