diff options
| author | Stefan Mavrodiev <stefan@olimex.com> | 2018-03-27 16:57:23 +0300 |
|---|---|---|
| committer | Jagan Teki <jagan@amarulasolutions.com> | 2018-04-23 09:42:56 +0300 |
| commit | 4744d81cc0dbe238bd4d8cd88c1c71022bffa621 (patch) | |
| tree | 284ebf85eaeec2d3ddc37d38725e1daa45a38480 /drivers/mmc/sunxi_mmc.c | |
| parent | 275d80a4c2fb63890f3f4c16b7ad481064e650a0 (diff) | |
| download | u-boot-4744d81cc0dbe238bd4d8cd88c1c71022bffa621.tar.xz | |
sunxi: mmc: Fix phase delays
U-boot driver for sunxi-mmc uses PLL6, unlike linux kernel where
PLL5 is used, with clock rates respectively 600MHz and 768MHz.
Thus there are different phase degree steps - 24 for the kernel and
30 for u-boot.
In the kernel driver the phase is set 90 deg for output and 120 for
sample. Dividing by 30 will result values 3 and 4. Those are the
values set in the u-boot driver.
However, the condition defining delays is wrong. MMC core driver
requests clock of 52MHz, sunxi-driver sets clock of 50MHz, but
phase is set 30 deg for output and 120 deg for sample.
Apparently this works for most cards.
On A20-SOM204-EVB-eMMC there is eMMC card (KLMAG2GEND) which complains
about it. Maybe there is other boards with similar problem?
So the fix is to match delays for both u-boot and kernel.
Signed-off-by: Stefan Mavrodiev <stefan@olimex.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Diffstat (limited to 'drivers/mmc/sunxi_mmc.c')
| -rw-r--r-- | drivers/mmc/sunxi_mmc.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/mmc/sunxi_mmc.c b/drivers/mmc/sunxi_mmc.c index df6f32850e..f4c245c5eb 100644 --- a/drivers/mmc/sunxi_mmc.c +++ b/drivers/mmc/sunxi_mmc.c @@ -147,19 +147,19 @@ static int mmc_set_mod_clk(struct sunxi_mmc_priv *priv, unsigned int hz) oclk_dly = 0; sclk_dly = 5; #ifdef CONFIG_MACH_SUN9I - } else if (hz <= 50000000) { + } else if (hz <= 52000000) { oclk_dly = 5; sclk_dly = 4; } else { - /* hz > 50000000 */ + /* hz > 52000000 */ oclk_dly = 2; sclk_dly = 4; #else - } else if (hz <= 50000000) { + } else if (hz <= 52000000) { oclk_dly = 3; sclk_dly = 4; } else { - /* hz > 50000000 */ + /* hz > 52000000 */ oclk_dly = 1; sclk_dly = 4; #endif |