lkml.org 
[lkml]   [2019]   [Oct]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] mmc: sdhci-omap: Fix Tuning procedure for temperatures < -20C
Date
According to the App note[1] detailing the tuning algorithm, for
temperatures < -20C, the initial tuning value should be min(largest
value in LPW - 24, ceil(13/16 ratio of LPW)). The largest value in
LPW is (max_window + 4 * (max_len - 1)) and not (max_window + 4 * max_len)
itself. Fix this implementation.

[1] http://www.ti.com/lit/an/spraca9b/spraca9b.pdf

Fixes: 961de0a856e3 ("mmc: sdhci-omap: Workaround errata regarding
SDR104/HS200 tuning failures (i929)")
Cc: stable@vger.kernel.org
Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
---
drivers/mmc/host/sdhci-omap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
index 41c2677c587f..083e7e053c95 100644
--- a/drivers/mmc/host/sdhci-omap.c
+++ b/drivers/mmc/host/sdhci-omap.c
@@ -372,7 +372,7 @@ static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode)
* on temperature
*/
if (temperature < -20000)
- phase_delay = min(max_window + 4 * max_len - 24,
+ phase_delay = min(max_window + 4 * (max_len - 1) - 24,
max_window +
DIV_ROUND_UP(13 * max_len, 16) * 4);
else if (temperature < 20000)
--
2.19.2
\
 
 \ /
  Last update: 2019-10-10 12:53    [W:0.052 / U:0.332 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site